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add note on cmyk profiles

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to the vipsthumbnail docs, see

https://github.com/jcupitt/libvips/issues/861
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John Cupitt 2018-01-23 13:09:51 +00:00
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doc/Using-vipsthumbnail.md
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@ -275,7 +275,27 @@ $ ls -l tn_shark.jpg
It’ll look identical to a user, but be almost half the size.
You can also specify a fallback input profile to use if the image has no
embedded one, but this is less useful.
embedded one. This can often happen with CMYK images, producing an error
message like:
```
$ vipsthumbnail kgdev.jpg
vipsthumbnail: unable to thumbnail kgdev.jpg
vips_colourspace: no known route from 'cmyk' to 'srgb'
```
If you supply a CMYK profile, it will be able to convert the image,
for example:
```
$ vipsthumbnail kgdev.jpg --iprofile /usr/share/color/icc/colord/FOGRA28L_webcoated.icc
```
I've had good results with this profile:
https://github.com/jcupitt/nip2/blob/master/share/nip2/data/cmyk.icm
It makes nice-looking images from most CMYK files, and is completely free.
# Auto-rotate