Hi, I have an urgent problem.
I have tried to convert an rgb image with a rgb icc profile to grayscale
image with a graycale icc profile in many ways.
None of them seems to work!! Has anyone got this to work?
1. When I do for instance (on version 5.5.7)
mogrify -profile sjm_gray.icc ph.jpg
I get the error: Operating on the wrong colorspace.
2. I also tried a more complicated strategy:
a.) First I converted the colorspace of the image to grayscale
b.) Then I removed the ICC profile from the image
c.) Then I assigned a grayscale Icc profile to the image
d.) when I tried to convert this image to another Icc grayscale
profile I've got the error: Operating on the wrong colorspace
This is the commands I have used:
mogrify -colorspace gray ph.jpg
mogrify +profile icc ph.jpg
mogrify -profile graygamma22.icm ph.jpg
mogrify -profile sjm_gray.icc ph.jpg
3. Then tried another complicated strategy from the commandline (using the
latest version of ImageMagick):
a.) First I converted the colorspace of the image to grayscale
b.) Then I removed the ICC profile from the image
c.) Then I assigned a grayscale Icc profile to the image
d.) when I tried to convert this image to another Icc grayscale
profile
e.) Then I converted the colorspace of the image to grayscale and when
I tried opened this image in Photoshop it had the correct icc-
profile attached, but the conversion of the image was not calculated
in the correct way (I tried to do the same thing in Photoshop)
This is the commands I have used:
mogrify -colorspace gray ph.jpg
mogrify +profile icc ph.jpg
mogrify -profile graygamma22.icm ph.jpg
mogrify -profile sjm_gray.icc ph.jpg
mogrify -colorspace gray ph.jpg
Does anyone know how to do the conversion of an RGB image to a grayscale
image with ICC profiles in a better way???
--
M.v.h.
Jacob Nordfalk
http://javabog.dk
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