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using EXIF profile for cmyk convertion?
Posted: 2007-09-28T06:17:32-07:00
by blahor
hi everybody,
i'm wondering if it's possible to use the EXIF profile to convert a jpg image to CMYK. it doesn't work here so i'm wondering if it's just my imagemagick version?
i tried:
Code: Select all
convert foo.jpg -profile cmyk.icc bar.jpg
unfortunately the resulting image isn't cmyk.
the only way it works here is:
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convert foo.jpg +profile icm -profile rgb.icc -profile cmyk.icc bar.jpg
or:
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convert foo.jpg -strip -profile rgb.icc -profile cmyk.icc bar.jpg
i have to process images from a lot of different cameras, so i'm a bit afraid i will get wrong colors by using a default rgb profile for all images.
Re: using EXIF profile for cmyk convertion?
Posted: 2007-09-28T06:42:19-07:00
by magick
Can you post a URL to one of your images so we can determine where the profile is embedded in your image and if ImageMagick detects it and extracts it properly.
Re: using EXIF profile for cmyk convertion?
Posted: 2007-09-28T06:57:24-07:00
by blahor
for testing i've just used a picture take with my eos400d:
http://fraglab.at/tmp/IMG_0039.JPG
and i think im does find the profile:
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$ identify -verbose IMG_0039.JPG | grep 'Profile*'
Profile-exif: 17638 bytes
the convertion fails though:
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$ convert IMG_0039.JPG -profile USWebCoatedSWOP.icc test.jpg
$ identify -verbose test.jpg | grep 'Color*'
Type: TrueColor
Colorspace: RGB
Colors: 583320
JPEG-Colorspace: 2
Color Space: 1
Re: using EXIF profile for cmyk convertion?
Posted: 2007-09-28T07:46:46-07:00
by magick
Just checking. You do know that an EXIF profile is not a color profile. Recent versions of ImageMagick assume a sRGB color profile if EXIF indicates it otherwise there would be no color profile associated with the JPEG image unless the profile is explicitly included with the image.
Re: using EXIF profile for cmyk convertion?
Posted: 2007-09-28T07:59:40-07:00
by blahor
magick wrote:Just checking. You do know that an EXIF profile is not a color profile. Recent versions of ImageMagick assume a sRGB color profile if EXIF indicates it otherwise there would be no color profile associated with the JPEG image unless the profile is explicitly included with the image.
actually i didn't know that. makes sense now, thx a lot.
