Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
I am having some trouble with all my tonemapping scripts. Seems as though they do not process exr images the same as they used to. I tracked it down to the very first step applying a log to the image. However, it does not seem to be related to using HDRI mode as it happens with or without HDRI.
1) What release was this done, if at all? The changelog seems to indicate a change in 6.7.6.9
2) Are you sure if the information stated by that user was correct?
3) If the change is correct, then how would I modify my scripts to reproduce the earlier results? Adding -gamma .4545 is way too dark and -gamma 2.2 is way too light
Edit:
Seems like adding -set colorspace sRGB may be the solution since it appears to work above. But I am having trouble finding where to put it so that it makes the scripts work.
See the following post about potentially a more fundamental issue, but related to the above.
Last edited by fmw42 on 2012-05-10T16:32:27-07:00, edited 5 times in total.
In fact, the problem seems to be with converting an exr to mpc or miff, which is the first step in my scripts
Taking the same image above and converting as follows to jpg works fine between the old im version and the current one. But converting to .mpc shows differences.
This works fine and the images are comparable:
im6 convert doll_small.exr 6doll_small.jpg
convert doll_small.exr -set colorspace sRGB 1doll_small.jpg
These resulting images are different despite the use -set colorspace sRGB for the current release.
im6 convert doll_small.exr 6doll_small.mpc
convert doll_small.exr -set colorspace sRGB 1doll_small.mpc
same for miff
More information:
Looking at the verbose info for doll_small.exr, I see it has a rendering intent of perceptual. I was just wondering if that should not be changed to undefined or none. Might that be the cause?
IM 6.7.6.9
Image: doll_small.exr
Format: EXR (High Dynamic-range (HDR))
Class: DirectClass
Geometry: 500x489+0+0
Resolution: 72x72
Print size: 6.94444x6.79167
Units: Undefined
Type: TrueColorMatte
Endianess: Undefined Colorspace: RGB
Depth: 16-bit
... Rendering intent: Perceptual Gamma: 1 Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Interlace: None
IM 6.7.4.10 (no gamma is set and rendering intent in undefined and no chromaticity values are specified)
Seems to me that exr images being linear colors, should not have any gamma or rendering intent or chromaticity values set.
Thus I believe that the current IM version 6.7.6.9 is still partially handling exr images wrong. The intent should be set to undefined and the chromaticity values removed, like it was in IM 6.7.4.10.
