![]() ![]() You will find that your current conversion results resemble the assumed originals pretty well (in lo-res of course). (I would have thought, that Frenetic Films would already get the good files. As these are movie stills, it's not that difficult. I never thought of doing something like that and the thumbnails are really small, but, well, it could give you hints that the process of the conversions is ok (better than the '-colorspace RGB' conversions).Ĭ) You could try to find the real originals (from where your source files were created). All three files contain a RGB thumbnail (from Photoshop). There are different rendering intents and for example (as snibgo indicated) there are also different versions of the sRGB profile.ī) You could compare the sRGB conversions with the thumbnails of your source files. I would just take that and be happy.īut since you still seem to be unsure about the result.Ī) You could of course experiment some more with the conversions. Perhaps that's not always the case with CMYK - so you really should change that line from that, your conversions look fine. Snibgo wrote:I think this is harmless (lossless) If identify -format "%r" "$in" | grep CMYK >/dev/null thenĬonvert "$in" -profile "$cmyk" -profile "$srgb" +profile '*' "$out" Srgb=/usr/share/ImageMagick-6.5.7/config/sRGB.icmĬonvert "$in" -profile "$profile" -profile "$srgb" +profile '*' "$out" So, an example of a conversion of a CMYK image without embedded profile into a sRGB image (and no embedding of the sRGB profile) could look like this:Ĭonvert input.jpg -strip -profile USWebCoatedSWOP.icc -profile "sRGB Color Space Profile.icm" -strip output.jpgįeel free to ask if something remains unclear.Ĭmyk=/docs/photos/icc/CMYK/USWebCoatedSWOP.icc If you don't want to embed the output color profile into the output image, you can add another '-strip' (or the +profile variant) - after the conversion with the profiles. ![]() Other orders of these options are sometimes possible, but the recommended order is to add these between your input and output image. This is to make sure that only the two specified color profiles are used (and not an additional color profile from the input image if it has one embedded). If you're not sure about embedded color profiles, then add '-strip' (which should delete all metadata) or at least '+profile "icc,icm"' (which deletes 'only' the color profiles) after the inputfile - like that:Ĭonvert inputfile.jpg -strip -profile inputprofile.icc -profile outputprofile.icc outputfile.jpg If it's not embedded, use a "convert inputfile.jpg -profile inputprofile.icc -profile outputprofile.icc outputfile.jpg" command.īy the way: If I have a CMYK picture and there's no embedded profile, I typically use "US Web Coated SWOP" as input color profile. If the profile is embedded, just use a "convert inputfile.jpg -profile outputprofile.icc outputfile.jpg" command. (OK, for me, when I started with color profiles, that topic was confusing for me as well.) I think, the documentation says it quite well. when the image looks under-saturated, one is able to say: 'That might be AdobeRGB, I'll try to use that profile and see if it looks correct then.' But that can't be a general approach.Īlbert25 wrote:Now what is the correct conversion? If there are false colors in the image or if there is no embedded color profile, and also no remark in the metadata, then it's the fault of the person that created/sent that file. (Of course you have to obtain the color profile from somewhere else in this case and you have to specify it manually at the commandline.)īut be careful as sometimes a 'hint' in the metadata is false or was not updated during earlier conversions of the file. If not and you discover a hint to the profile in the metadata, try to use that. If ImageMagick shows that an ICC profile is embedded, use that. So, if you want to be sure, use "identify -verbose" on the file (or even something like exiftool). ![]() Sometimes, profiles are not embedded and there is only a textual reference in the metadata (e.g. And with AdobeRGB files, it almost always is, I would say. Well, the profile should be embedded (if it's not sRGB). Albert25 wrote:Is there always an embedded profile in AdobeRGB? If not, how can I find out if the image is sRGB or AdobeRGB? ![]()
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