From 1214d642f6745fa6529fc5e3a40570c8ffeb1ad0 Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Wed, 18 Mar 2020 20:20:20 -0400 Subject: [PATCH 01/11] Elaborate on what premultiplied alpha is --- images/premultiplied-example-1.png | Bin 0 -> 10732 bytes images/premultiplied-example-2.png | Bin 0 -> 14453 bytes images/premultiplied-example-3.png | Bin 0 -> 13698 bytes images/premultiplied-example-4.png | Bin 0 -> 13877 bytes images/premultiplied-example-5.png | Bin 0 -> 14352 bytes source | 92 +++++++++++++++++++++++++++-- 6 files changed, 87 insertions(+), 5 deletions(-) create mode 100644 images/premultiplied-example-1.png create mode 100644 images/premultiplied-example-2.png create mode 100644 images/premultiplied-example-3.png create mode 100644 images/premultiplied-example-4.png create mode 100644 images/premultiplied-example-5.png diff --git a/images/premultiplied-example-1.png b/images/premultiplied-example-1.png new file mode 100644 index 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Path2D { +

+

+ Premultiplied alpha refers to one way of representing transparency in an image, the other being non-premultiplied alpha. +

+ +

+ Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that pixel's color, + and its alpha channel represents that pixel's opacity. +

+ +

+ Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that pixel adds + to the image, and its alpha channel represents the amount that the pixel obscures whatever is behind it. +

+ +

For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these example colors are represented in the following ways:

+ + + + + + + + + + +
CSS color representation + Premultiplied representation + Non-premultiplied representation + Description of color + Image of color blended above other content +
rgba(255, 127, 0, 1) + 255, 127, 0, 255 + 255, 127, 0, 255 + Completely-opaque orange + +
rgba(255, 255, 0, 0.5) + 127, 127, 0, 127 + 255, 255, 0, 127 + Halfway-opaque yellow + +
Unrepresentable + 255, 127, 0, 127 + Unrepresentable + Additive halfway-opaque orange + +
Unrepresentable + 255, 127, 0, 0 + Unrepresentable + Additive fully-transparent orange + +
rgba(255, 127, 0, 0) + Unrepresentable + 255, 127, 0, 0 + Fully-transparent ("invisible") orange + +
+ +

+ Converting a color value from a non-premultiplied representation to a premultiplied one involves + multiplying the color's red, green, and blue channels by its alpha channel (where an alpha of 0 + means transparent, and an alpha of 1 means opaque). +

+ +

+ Converting a color value from a premultiplied representation to a non-premultiplied one involves + the inverse: dividing the color's red, green, and blue channels by its alpha channel. +

+ +

+ As certain colors can only be represented under premultiplied alpha (for instance, additive + colors), and others can only be represented under non-premultiplied alpha (for instance, + "invisible" colors which hold certain red, green, and blue values even with no opacity); + and division and multiplication on 8-bit integers (which is how canvas' colors are currently + stored) entails a loss of precision, converting between premultiplied and non-premultiplied + alpha is a lossy operation on colors that are not fully opaque. +

+
+
-

A CanvasRenderingContext2D object has an output bitmap that - is initialized when the object is created.

+

+ A CanvasRenderingContext2D object has an output bitmap that + is initialized when the object is created. This output bitmap must use + premultiplied alpha to represent transparent colors. +

The output bitmap has an sy+sh), (sx, sy+sh), in the bitmap's coordinate space units. Pixels outside the output bitmap must be set to transparent black. Pixel - values must not be premultiplied by alpha.

+ values must not be premultiplied by alpha.

When the user agent is required to create an ImageData object, given a positive integer number of rows rows, a positive integer number of pixels per row @@ -64167,9 +64249,9 @@ try { in the rendering context's output bitmap.

-

Due to the lossy nature of converting to and from premultiplied alpha color +

Due to the lossy nature of converting to and from premultiplied alpha color values, pixels that have just been set using putImageData() might be returned to an equivalent + data-x="dom-context-2d-putImageData">putImageData(), and are not completely opaque, might be returned to an equivalent getImageData() as different values.

The current path, transformation matrix, From 4b127c076def0e4c836ed7a4990810477e6446d6 Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Wed, 18 Mar 2020 20:33:27 -0400 Subject: [PATCH 02/11] Add alt attributes to images --- source | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/source b/source index e647eec7700..0e141680623 100644 --- a/source +++ b/source @@ -60388,31 +60388,31 @@ interface Path2D { 255, 127, 0, 255 255, 127, 0, 255 Completely-opaque orange - + Completely-opaque orange rgba(255, 255, 0, 0.5) 127, 127, 0, 127 255, 255, 0, 127 Halfway-opaque yellow - + Halfway-opaque yellow Unrepresentable 255, 127, 0, 127 Unrepresentable Additive halfway-opaque orange - + Additive halfway-opaque orange Unrepresentable 255, 127, 0, 0 Unrepresentable Additive fully-transparent orange - + Additive fully-transparent orange rgba(255, 127, 0, 0) Unrepresentable 255, 127, 0, 0 Fully-transparent ("invisible") orange - + Fully-transparent ("invisible") orange

From a7ceae593f8ba71996d8e970ad4e6b9a6ccb0dfc Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Sun, 29 Mar 2020 04:33:57 -0400 Subject: [PATCH 03/11] Clarify some premultiplied alpha stuff --- source | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/source b/source index 0e141680623..c9616c34572 100644 --- a/source +++ b/source @@ -60368,7 +60368,7 @@ interface Path2D {

- Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that pixel adds + Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that the pixel adds to the image, and its alpha channel represents the amount that the pixel obscures whatever is behind it.

@@ -60409,10 +60409,16 @@ interface Path2D { Additive fully-transparent orange rgba(255, 127, 0, 0) - Unrepresentable + 0, 0, 0, 0 255, 127, 0, 0 Fully-transparent ("invisible") orange Fully-transparent ("invisible") orange + + rgba(0, 127, 255, 0) + 0, 0, 0, 0 + 255, 127, 0, 0 + Fully-transparent ("invisible") turquoise + Fully-transparent ("invisible") turquoise

From 2e36881f5724a05d0650f028e215746204835aa9 Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 15:27:44 -0400 Subject: [PATCH 04/11] Move premultiplied alpha definition to subsection --- source | 174 +++++++++++++++++++++++++++++---------------------------- 1 file changed, 89 insertions(+), 85 deletions(-) diff --git a/source b/source index c9616c34572..765ffa9137d 100644 --- a/source +++ b/source @@ -60357,91 +60357,6 @@ interface Path2D { -

-

- Premultiplied alpha refers to one way of representing transparency in an image, the other being non-premultiplied alpha. -

- -

- Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that pixel's color, - and its alpha channel represents that pixel's opacity. -

- -

- Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that the pixel adds - to the image, and its alpha channel represents the amount that the pixel obscures whatever is behind it. -

- -

For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these example colors are represented in the following ways:

- - - - - - - - - - - -
CSS color representation - Premultiplied representation - Non-premultiplied representation - Description of color - Image of color blended above other content -
rgba(255, 127, 0, 1) - 255, 127, 0, 255 - 255, 127, 0, 255 - Completely-opaque orange - Completely-opaque orange -
rgba(255, 255, 0, 0.5) - 127, 127, 0, 127 - 255, 255, 0, 127 - Halfway-opaque yellow - Halfway-opaque yellow -
Unrepresentable - 255, 127, 0, 127 - Unrepresentable - Additive halfway-opaque orange - Additive halfway-opaque orange -
Unrepresentable - 255, 127, 0, 0 - Unrepresentable - Additive fully-transparent orange - Additive fully-transparent orange -
rgba(255, 127, 0, 0) - 0, 0, 0, 0 - 255, 127, 0, 0 - Fully-transparent ("invisible") orange - Fully-transparent ("invisible") orange -
rgba(0, 127, 255, 0) - 0, 0, 0, 0 - 255, 127, 0, 0 - Fully-transparent ("invisible") turquoise - Fully-transparent ("invisible") turquoise -
- -

- Converting a color value from a non-premultiplied representation to a premultiplied one involves - multiplying the color's red, green, and blue channels by its alpha channel (where an alpha of 0 - means transparent, and an alpha of 1 means opaque). -

- -

- Converting a color value from a premultiplied representation to a non-premultiplied one involves - the inverse: dividing the color's red, green, and blue channels by its alpha channel. -

- -

- As certain colors can only be represented under premultiplied alpha (for instance, additive - colors), and others can only be represented under non-premultiplied alpha (for instance, - "invisible" colors which hold certain red, green, and blue values even with no opacity); - and division and multiplication on 8-bit integers (which is how canvas' colors are currently - stored) entails a loss of precision, converting between premultiplied and non-premultiplied - alpha is a lossy operation on colors that are not fully opaque. -

-
-

@@ -65828,6 +65743,95 @@ interface OffscreenCanvasRenderingContext2D {

+
+
Premultiplied alpha
+ +

+ Premultiplied alpha refers to one way of representing transparency in an image, the other being non-premultiplied alpha. +

+ +

+ Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that pixel's color, + and its alpha channel represents that pixel's opacity. +

+ +

+ Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that the pixel adds + to the image, and its alpha channel represents the amount that the pixel obscures whatever is behind it. +

+ +
+

For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these example colors are represented in the following ways:

+ + + + + + + + + + + +
CSS color representation + Premultiplied representation + Non-premultiplied representation + Description of color + Image of color blended above other content +
rgba(255, 127, 0, 1) + 255, 127, 0, 255 + 255, 127, 0, 255 + Completely-opaque orange + Completely-opaque orange +
rgba(255, 255, 0, 0.5) + 127, 127, 0, 127 + 255, 255, 0, 127 + Halfway-opaque yellow + Halfway-opaque yellow +
Unrepresentable + 255, 127, 0, 127 + Unrepresentable + Additive halfway-opaque orange + Additive halfway-opaque orange +
Unrepresentable + 255, 127, 0, 0 + Unrepresentable + Additive fully-transparent orange + Additive fully-transparent orange +
rgba(255, 127, 0, 0) + 0, 0, 0, 0 + 255, 127, 0, 0 + Fully-transparent ("invisible") orange + Fully-transparent ("invisible") orange +
rgba(0, 127, 255, 0) + 0, 0, 0, 0 + 255, 127, 0, 0 + Fully-transparent ("invisible") turquoise + Fully-transparent ("invisible") turquoise +
+
+ +

+ Converting a color value from a non-premultiplied representation to a premultiplied one involves + multiplying the color's red, green, and blue channels by its alpha channel (where an alpha of 0 + means transparent, and an alpha of 1 means opaque). +

+ +

+ Converting a color value from a premultiplied representation to a non-premultiplied one involves + the inverse: dividing the color's red, green, and blue channels by its alpha channel. +

+ +

+ As certain colors can only be represented under premultiplied alpha (for instance, additive + colors), and others can only be represented under non-premultiplied alpha (for instance, + "invisible" colors which hold certain red, green, and blue values even with no opacity); + and division and multiplication on 8-bit integers (which is how canvas' colors are currently + stored) entails a loss of precision, converting between premultiplied and non-premultiplied + alpha is a lossy operation on colors that are not fully opaque. +

+
+

Custom elements

Introduction

From 76fbc56460f745a64173f07261303a868dd6e04c Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 15:34:31 -0400 Subject: [PATCH 05/11] Move "output bitmap premultiplied" to the section --- source | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/source b/source index 765ffa9137d..9498abbf1a2 100644 --- a/source +++ b/source @@ -60361,8 +60361,7 @@ interface Path2D {

A CanvasRenderingContext2D object has an output bitmap that - is initialized when the object is created. This output bitmap must use - premultiplied alpha to represent transparent colors. + is initialized when the object is created.

@@ -65744,7 +65743,7 @@ interface OffscreenCanvasRenderingContext2D {
-
Premultiplied alpha
+
Premultiplied alpha and the 2D rendering context

Premultiplied alpha refers to one way of representing transparency in an image, the other being non-premultiplied alpha. @@ -65830,6 +65829,9 @@ interface OffscreenCanvasRenderingContext2D { stored) entails a loss of precision, converting between premultiplied and non-premultiplied alpha is a lossy operation on colors that are not fully opaque.

+ + A CanvasRenderingContext2D's output bitmap must use premultiplied alpha + to represent transparent colors.

Custom elements

From 72d43ce4294e4bb95c39ea285e19143cb419bc4b Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 15:37:00 -0400 Subject: [PATCH 06/11] Also specify offscreen canvas premultiplication --- source | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/source b/source index 9498abbf1a2..600149f4e63 100644 --- a/source +++ b/source @@ -65830,8 +65830,11 @@ interface OffscreenCanvasRenderingContext2D { alpha is a lossy operation on colors that are not fully opaque.

- A CanvasRenderingContext2D's output bitmap must use premultiplied alpha - to represent transparent colors. +

+ A CanvasRenderingContext2D's output bitmap and an + OffscreenCanvasRenderingContext2D's bitmap must use premultiplied alpha to represent transparent colors. +

Custom elements

From 8c9cb5089d441f74c0c31583ad3829dd7d3c480b Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 15:49:28 -0400 Subject: [PATCH 07/11] Note why canvas premultiplication is mandatory --- source | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/source b/source index 600149f4e63..48a1412b4da 100644 --- a/source +++ b/source @@ -65835,6 +65835,14 @@ interface OffscreenCanvasRenderingContext2D { OffscreenCanvasRenderingContext2D's bitmap must use premultiplied alpha to represent transparent colors.

+ +
+ It is important for canvas bitmaps to represent colors using premultiplied alpha because it + affects the range of representable colors. While additive colors cannot currently be drawn onto + canvases directly because CSS colors are non-premultiplied and cannot represent them, it is + still possible to, for instance, draw additive colors onto a WebGL canvas and then draw that + WebGL canvas onto a 2D canvas via drawImage. +

Custom elements

From 62311e16bb7388f4d54c12c14ebf646a97ee9423 Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 15:54:50 -0400 Subject: [PATCH 08/11] Rewrap text --- source | 40 ++++++++++++++++++++++------------------ 1 file changed, 22 insertions(+), 18 deletions(-) diff --git a/source b/source index 48a1412b4da..a443bf7d0dd 100644 --- a/source +++ b/source @@ -60359,10 +60359,8 @@ interface Path2D {
-

- A CanvasRenderingContext2D object has an output bitmap that - is initialized when the object is created. -

+

A CanvasRenderingContext2D object has an output bitmap that + is initialized when the object is created.

The output bitmap has an output bitmap.

-

Due to the lossy nature of converting to and from premultiplied alpha color - values, pixels that have just been set using putImageData(), and are not completely opaque, might be returned to an equivalent - getImageData() as different values.

+

Due to the lossy nature of converting to and from premultiplied alpha color values, pixels that have + just been set using putImageData(), and are not + completely opaque, might be returned to an equivalent getImageData() as different values.

The current path, transformation matrix, shadow attributes, global @@ -65746,21 +65745,26 @@ interface OffscreenCanvasRenderingContext2D {

Premultiplied alpha and the 2D rendering context

- Premultiplied alpha refers to one way of representing transparency in an image, the other being non-premultiplied alpha. + Premultiplied alpha refers to one way of + representing transparency in an image, the other being non-premultiplied alpha.

- Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that pixel's color, - and its alpha channel represents that pixel's opacity. + Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that + pixel's color, and its alpha channel represents that pixel's opacity.

- Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the amounts of color that the pixel adds - to the image, and its alpha channel represents the amount that the pixel obscures whatever is behind it. + Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the + amounts of color that the pixel adds to the image, and its alpha channel represents the amount + that the pixel obscures whatever is behind it.

-

For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these example colors are represented in the following ways:

+

+ For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these + example colors are represented in the following ways: +

@@ -65824,10 +65828,10 @@ interface OffscreenCanvasRenderingContext2D {

As certain colors can only be represented under premultiplied alpha (for instance, additive colors), and others can only be represented under non-premultiplied alpha (for instance, - "invisible" colors which hold certain red, green, and blue values even with no opacity); - and division and multiplication on 8-bit integers (which is how canvas' colors are currently - stored) entails a loss of precision, converting between premultiplied and non-premultiplied - alpha is a lossy operation on colors that are not fully opaque. + "invisible" colors which hold certain red, green, and blue values even with no opacity); and + division and multiplication on 8-bit integers (which is how canvas' colors are currently stored) + entails a loss of precision, converting between premultiplied and non-premultiplied alpha is a + lossy operation on colors that are not fully opaque.

From f13e1e3d355629209087eebed340b6c162fc0a1f Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Tue, 16 Mar 2021 17:27:20 -0400 Subject: [PATCH 09/11] Link to premultiplication info in ImageBitmap --- source | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/source b/source index a443bf7d0dd..265c6f32876 100644 --- a/source +++ b/source @@ -65815,14 +65815,16 @@ interface OffscreenCanvasRenderingContext2D {

- Converting a color value from a non-premultiplied representation to a premultiplied one involves - multiplying the color's red, green, and blue channels by its alpha channel (where an alpha of 0 - means transparent, and an alpha of 1 means opaque). + Converting a color value from a non-premultiplied + representation to a premultiplied one involves multiplying the color's red, green, and + blue channels by its alpha channel (remapping the range of the alpha channel such that "fully + transparent" is 0, and "fully opaque" is 1).

- Converting a color value from a premultiplied representation to a non-premultiplied one involves - the inverse: dividing the color's red, green, and blue channels by its alpha channel. + Converting a color value from a premultiplied + representation to a non-premultiplied one involves the inverse: dividing the color's red, + green, and blue channels by its alpha channel.

@@ -94819,7 +94821,7 @@ dictionary ImageBitmapOptions { if the premultiplyAlpha option is set to "premultiply", the bitmap data's color channels are - premultiplied by its alpha channel. + premultiplied by its alpha channel.

Rejects the promise with an "InvalidStateError" DOMException if the source image is not in a valid state (e.g., an img @@ -95259,14 +95261,15 @@ dictionary ImageBitmapOptions { optimal for drawing images onto the canvas.

  • If val is "premultiply", the output - that is not premultiplied by alpha must have its color components multiplied by alpha and - that is premultiplied by alpha must be left untouched.

    • + data-x="dom-PremultiplyAlpha-premultiply">premultiply", the output that + is not premultiplied by alpha must have its color components multiplied by alpha and that is premultiplied by alpha + must be left untouched.

  • If val is "none", the output that is not - premultiplied by alpha must be left untouched and that is premultiplied by alpha must have - its color components divided by alpha.

    • + premultiplied by alpha must be left untouched and that is premultiplied by alpha must have its + color components divided by alpha.

    From 2bbf985ab81fad4318d8a9b597d18a3247fd6770 Mon Sep 17 00:00:00 2001 From: Domenic Denicola Date: Wed, 31 Mar 2021 18:36:00 -0400 Subject: [PATCH 10/11] Source formatting nits and include in the dev edition --- source | 178 +++++++++++++++++++++++++-------------------------------- 1 file changed, 79 insertions(+), 99 deletions(-) diff --git a/source b/source index 265c6f32876..c95fe1640e7 100644 --- a/source +++ b/source @@ -60360,7 +60360,7 @@ interface Path2D {

    A CanvasRenderingContext2D object has an output bitmap that - is initialized when the object is created.

    + is initialized when the object is created.

    The output bitmap has an OffscreenCanvasRenderingContext2D {

    -
    -
    Premultiplied alpha and the 2D rendering context
    +
    Premultiplied alpha and the 2D rendering context
    -

    - Premultiplied alpha refers to one way of - representing transparency in an image, the other being non-premultiplied alpha. -

    +

    Premultiplied alpha refers to one way of + representing transparency in an image, the other being non-premultiplied alpha.

    -

    - Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that - pixel's color, and its alpha channel represents that pixel's opacity. -

    +

    Under non-premultiplied alpha, the red, green, and blue channels of a pixel represent that + pixel's color, and its alpha channel represents that pixel's opacity.

    -

    - Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the - amounts of color that the pixel adds to the image, and its alpha channel represents the amount - that the pixel obscures whatever is behind it. -

    +

    Under premultiplied alpha, however, the red, green, and blue channels of a pixel represent the + amounts of color that the pixel adds to the image, and its alpha channel represents the amount + that the pixel obscures whatever is behind it.

    -
    -

    - For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these - example colors are represented in the following ways: -

    +
    +

    For instance, assuming the color channels range from 0 (off) to 255 (full intensity), these + example colors are represented in the following ways:

    -
    - - - - - - - - - + + + + + + +
    CSS color representation - Premultiplied representation - Non-premultiplied representation - Description of color - Image of color blended above other content -
    rgba(255, 127, 0, 1) - 255, 127, 0, 255 - 255, 127, 0, 255 - Completely-opaque orange - Completely-opaque orange -
    rgba(255, 255, 0, 0.5) - 127, 127, 0, 127 - 255, 255, 0, 127 - Halfway-opaque yellow - Halfway-opaque yellow -
    Unrepresentable - 255, 127, 0, 127 - Unrepresentable - Additive halfway-opaque orange - Additive halfway-opaque orange -
    Unrepresentable - 255, 127, 0, 0 - Unrepresentable - Additive fully-transparent orange - Additive fully-transparent orange -
    rgba(255, 127, 0, 0) - 0, 0, 0, 0 - 255, 127, 0, 0 - Fully-transparent ("invisible") orange - Fully-transparent ("invisible") orange + + -
    rgba(0, 127, 255, 0) - 0, 0, 0, 0 - 255, 127, 0, 0 - Fully-transparent ("invisible") turquoise - Fully-transparent ("invisible") turquoise -
    - +     		CSS color representation + Premultiplied representation + Non-premultiplied representation + Description of color + Image of color blended above other content +
    rgba(255, 127, 0, 1) + 255, 127, 0, 255 + 255, 127, 0, 255 + Completely-opaque orange + Completely-opaque orange +
    rgba(255, 255, 0, 0.5) + 127, 127, 0, 127 + 255, 255, 0, 127 + Halfway-opaque yellow + Halfway-opaque yellow +
    Unrepresentable + 255, 127, 0, 127 + Unrepresentable + Additive halfway-opaque orange + Additive halfway-opaque orange +
    Unrepresentable + 255, 127, 0, 0 + Unrepresentable + Additive fully-transparent orange + Additive fully-transparent orange +
    rgba(255, 127, 0, 0) + 0, 0, 0, 0 + 255, 127, 0, 0 + Fully-transparent ("invisible") orange + Fully-transparent ("invisible") orange +
    rgba(0, 127, 255, 0) + 0, 0, 0, 0 + 255, 127, 0, 0 + Fully-transparent ("invisible") turquoise + Fully-transparent ("invisible") turquoise +
    +
    -

    - Converting a color value from a non-premultiplied - representation to a premultiplied one involves multiplying the color's red, green, and - blue channels by its alpha channel (remapping the range of the alpha channel such that "fully - transparent" is 0, and "fully opaque" is 1). -

    +

    Converting a color value from a non-premultiplied + representation to a premultiplied one involves multiplying the color's red, green, and + blue channels by its alpha channel (remapping the range of the alpha channel such that "fully + transparent" is 0, and "fully opaque" is 1).

    -

    - Converting a color value from a premultiplied - representation to a non-premultiplied one involves the inverse: dividing the color's red, - green, and blue channels by its alpha channel. -

    +

    Converting a color value from a premultiplied + representation to a non-premultiplied one involves the inverse: dividing the color's red, + green, and blue channels by its alpha channel.

    -

    - As certain colors can only be represented under premultiplied alpha (for instance, additive - colors), and others can only be represented under non-premultiplied alpha (for instance, - "invisible" colors which hold certain red, green, and blue values even with no opacity); and - division and multiplication on 8-bit integers (which is how canvas' colors are currently stored) - entails a loss of precision, converting between premultiplied and non-premultiplied alpha is a - lossy operation on colors that are not fully opaque. -

    +

    As certain colors can only be represented under premultiplied alpha (for instance, additive + colors), and others can only be represented under non-premultiplied alpha (for instance, + "invisible" colors which hold certain red, green, and blue values even with no opacity); and + division and multiplication on 8-bit integers (which is how canvas' colors are currently stored) + entails a loss of precision, converting between premultiplied and non-premultiplied alpha is a + lossy operation on colors that are not fully opaque.

    -

    - A CanvasRenderingContext2D's output bitmap and an - OffscreenCanvasRenderingContext2D's bitmap must use premultiplied alpha to represent transparent colors. -

    +

    A CanvasRenderingContext2D's output bitmap and an + OffscreenCanvasRenderingContext2D's bitmap must use premultiplied alpha to represent transparent colors.

    -
    - It is important for canvas bitmaps to represent colors using premultiplied alpha because it - affects the range of representable colors. While additive colors cannot currently be drawn onto - canvases directly because CSS colors are non-premultiplied and cannot represent them, it is - still possible to, for instance, draw additive colors onto a WebGL canvas and then draw that - WebGL canvas onto a 2D canvas via drawImage. -
    -
    +

    It is important for canvas bitmaps to represent colors using premultiplied alpha + because it affects the range of representable colors. While additive colors cannot currently be + drawn onto canvases directly because CSS colors are non-premultiplied and cannot represent them, + it is still possible to, for instance, draw additive colors onto a WebGL canvas and then draw that + WebGL canvas onto a 2D canvas via drawImage().

    Custom elements

    From 9ee37bd7ebf837a2625bd43c10da82429669da0d Mon Sep 17 00:00:00 2001 From: adroitwhiz Date: Mon, 5 Apr 2021 14:44:51 -0400 Subject: [PATCH 11/11] Clarify alt text --- source | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/source b/source index c95fe1640e7..4b005e83ea1 100644 --- a/source +++ b/source @@ -65771,37 +65771,37 @@ interface OffscreenCanvasRenderingContext2D { 255, 127, 0, 255 255, 127, 0, 255 Completely-opaque orange - Completely-opaque orange + An opaque orange circle sits atop a background rgba(255, 255, 0, 0.5) 127, 127, 0, 127 255, 255, 0, 127 Halfway-opaque yellow - Halfway-opaque yellow + A yellow circle, halfway transparent, sits atop a background Unrepresentable 255, 127, 0, 127 Unrepresentable Additive halfway-opaque orange - Additive halfway-opaque orange + An orange circle somewhat brightens the background that it sits atop Unrepresentable 255, 127, 0, 0 Unrepresentable Additive fully-transparent orange - Additive fully-transparent orange + An orange circle completely brightens the background that it sits atop rgba(255, 127, 0, 0) 0, 0, 0, 0 255, 127, 0, 0 Fully-transparent ("invisible") orange - Fully-transparent ("invisible") orange + An empty background with nothing atop it rgba(0, 127, 255, 0) 0, 0, 0, 0 255, 127, 0, 0 Fully-transparent ("invisible") turquoise - Fully-transparent ("invisible") turquoise + An empty background with nothing atop it