Resize image to "Fit Contain" the given width/height

[andrefelipe]

So embarrassed to ask this, I did look a lot myself, in web, in Sharp source code and libvips too, sorry.

How to do in PHP a resize of a image to contain inside an area and fill the empty space with a color?

The result I need is:
— Resize a image to contain inside a 1080 x 1080px area (centered);
— Fill the background space with #222222 color;
— The resulting image is always 1080 x 1080px;

Exactly like the Sharp resize API, with the "fit" option:
https://sharp.pixelplumbing.com/api-resize#resize

[jcupitt]

Hey @andrefelipe,

Use thumbnail to fit within 1080x1080 (so one axis is cropped), then use gravity to expand to exactly the size you need. Perhaps (untested):

$image = Vips\Image::thumbnail("some-image-file.xxx", 1080);
$image = $image->gravity("centre", 1080, 1080, ["extend" => "background", "background" => 86]);
$image->WriteToFile("thumb.jpg");

[andrefelipe]

Thank you very much!

What is the color format for the "background" option?

I tried HEX "#222222" (with or without #) and tried too "34, 34, 34" but didn't work.

[jcupitt]

Just use "background" => 86. 22h is 86 in decimal. You can also use "background" => [86, 86, 86], but if the three numbers are the same you can use a simple scalar.

[andrefelipe]

OK, got it!

It's RGB then.

I confused because HEX 222222 is actually RGB 34, 34, 34.
(RGB 86, 86, 86 is a lot brighter)

I'm using background" => 34 then.

Thank you very very much for your time and attention. Have a pleasant Sunday.

[jcupitt]

Ooop, brain fart, you're right, 34 is the correct value.