John Cupitt
OK, seems to all work, ready for testing. @ryanobeirne if you could check the output, that'd be great. With this test image: http://www.rollthepotato.net/~john/theo-kickbike.jpg I ran: ``` $ vips icc_export theo-kickbike.jpg...
I think GIMP at least just doesn't support 6 colour separations. `eog` is the same. I don't know what Photoshop support for N-colour separations is like :( I'll be interested...
Could you post the TIFF that Photoshop makes for 6-channel TIFF export? I can check the internal structure.
I tried making the libvips 6clr TIFF output a bit more like the photoshop one: http://www.rollthepotato.net/~john/theo-kickbike2.tif Would you be able to test it? It probably won't work, but you never...
Another version -- this one has the IMAGEDESCRIPTION metadata stripped: http://www.rollthepotato.net/~john/theo-kickbike3.tif
No, there's nothing in TIFF about spot colours -- it just has SEPARATED (meaning, some kind of set of inks) with the first four as CMYK. If you run `tiffinfo`...
... now I look I realize I stripped the ICC profile as well! duh. Could you try importing `theo-kickbike3.tif` using your 6 colour profile?
Sorry, I don't know photoshop, but after loading, can you somehow attach a profile to the image?
I had another go ... here's a version with the profile embedded and the tags matching photoshop. Is there an error on load? http://www.rollthepotato.net/~john/theo-kickbike4.tif
Yes, libvips will make a CIELAB TIFF from that saved TIFF file, but I don't know if Photoshop will. It'll look just like that washed out RGB I made above...