Make it easier to deal with InexactError on save()

[xanderdunn]

I am trying to save("image.png", myimg) where myimg =

RGB Images.Image with:
  data: 160x210 Array{ColorTypes.RGB{Float64},2}
  properties:
    timedim: 0
    spatialorder:  y x
    pixelspacing:  1.0 1.0

And I always get this error:

INFO: Recompiling stale cache file /Users/admin/.julia/lib/v0.4/ImageMagick.ji for module ImageMagick.
WARNING: InexactError()
 in trunc at float.jl:357
 in _map_a! at /Users/admin/.julia/v0.4/Images/src/map.jl:381
 in map! at /Users/admin/.julia/v0.4/Images/src/map.jl:373
 in image2wand at /Users/admin/.julia/v0.4/ImageMagick/src/ImageMagick.jl:151
 in save_ at /Users/admin/.julia/v0.4/ImageMagick/src/ImageMagick.jl:146
 in save at /Users/admin/.julia/v0.4/ImageMagick/src/ImageMagick.jl:64
 in save at /Users/admin/.julia/v0.4/FileIO/src/loadsave.jl:92
 in save at /Users/admin/.julia/v0.4/FileIO/src/loadsave.jl:51
 in getstate at /local/dev/odin-core/AgentEnvironmentInterface/src/environment/pong.jl:94
 in include at /usr/local/Cellar/julia/0.4.1/lib/julia/sys.dylib
 in include_from_node1 at /usr/local/Cellar/julia/0.4.1/lib/julia/sys.dylib
 in process_options at /usr/local/Cellar/julia/0.4.1/lib/julia/sys.dylib
 in _start at /usr/local/Cellar/julia/0.4.1/lib/julia/sys.dylib

Is it the same as #213?

I'm on released Julia 0.4 with:

• ImageMagick 0.1.1
• Images 0.5.0

[kalvotom]

I run into a similar problem. My image is gray scale only:

julia> img
Gray Images.Image with:
  data: 60x60 Array{Float64,2}
  properties:
    colorspace: Gray
    spatialorder:  x y

save fails with:

julia> save("fig.png", img)
WARNING: InexactError()
 in trunc at float.jl:357
 [inlined code] from /home/kalvin/.julia/v0.5/FixedPointNumbers/src/ufixed.jl:54
 in _map_a! at /home/kalvin/.julia/v0.5/Images/src/map.jl:381
 in map! at /home/kalvin/.julia/v0.5/Images/src/map.jl:373
 [inlined code] from /home/kalvin/.julia/v0.5/Images/src/map.jl:349
 in image2wand at /home/kalvin/.julia/v0.5/ImageMagick/src/ImageMagick.jl:151
 in save_ at /home/kalvin/.julia/v0.5/ImageMagick/src/ImageMagick.jl:146
 in save at /home/kalvin/.julia/v0.5/ImageMagick/src/ImageMagick.jl:64
 in save at /home/kalvin/.julia/v0.5/FileIO/src/loadsave.jl:92
 in save at /home/kalvin/.julia/v0.5/FileIO/src/loadsave.jl:51
 in eval at ./boot.jl:264

My Julia version is julia version 0.5.0-dev, running on a Linux operating system.

Interestingly, I am able to save the image provided it contains only 0.0 and 1.0 entries...

[timholy]

This is deliberate; see #256 (comment). The error message is thrown to warn you that your image has values that cannot be represented in the file format.

You can use clamp!(img2, 0, 1) or more generally the ClampMinMax or Clamp01NaN. See the online help on each.

[xanderdunn]

This is what worked for me: save("image.png", rgb_image, mapi=Images.mapinfo(Images.Clamp, rgb_image))

This was very non-intuitive. I was able to figure it out by looking at a test in test.io.jl that doesn't exist anymore.

[timholy]

It's over at ImageMagick.jl.

[timholy]

Oops, meant to push that to a branch. See also JuliaIO/ImageMagick.jl#18.