using EXIF profile for cmyk convertion?

[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:

Code: Select all

convert foo.jpg +profile icm -profile rgb.icc -profile cmyk.icc bar.jpg

or:

Code: Select all

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.

[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.

[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:

Code: Select all

$ identify -verbose IMG_0039.JPG | grep 'Profile*'
  Profile-exif: 17638 bytes

the convertion fails though:

Code: Select all

$ 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

[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.

[blahor]

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.