GNOME Bugzilla – Bug 72344
Support PSD files with Duotone data.
Last modified: 2018-05-24 10:40:38 UTC
I don't know if loading of photoshop files is really intended to be supported at all, but I've got one that Gimp can't read -- it says "PSD: Image type 8 (Duotone) is not supported in this data format". I would have just assumed that psd isn't supported at all, but since it recognised it and apparently made an attempt, I thought I'd let you know. The file is 763K, so I won't attach it here unless you ask for it. Do you want it? If so, please let me know soon, or it may vanish...
Yes, please attach the PSD file. It might help to improve the PSD loader.
Created attachment 6832 [details] photoshop file: Image type 8 (Duotone)
ImageMagick 5.4.8 is able to read this file, so we could borrow some code :)
Changes at the request of Dave Neary on the developer mailing list. I am changing many of the bugzilla reports that have not specified a target milestone to Future milestone. Hope that is acceptable.
The question here is that GIMP doesn't has support for DUOTONE. I don't know if the cause is the GEGL, CMYK and other futures implementations problems, but this is an important skill and could be marked as an enhancement (not the PSD import, but the DUOTONE support).
*** Bug 504514 has been marked as a duplicate of this bug. ***
Created attachment 356989 [details] GIMP master rendering as of 2017-08-05. Hi, I don't know if you are still around. I tested your PSD and it loads now (also I can see code about duotone in psd-load, though not in psd-save). The resulting image is in grayscale mode. Is duotone a grayscale in Photoshop? I would assume, it is slightly different since I can see there is also a grayscale mode. I attached the resulting rendering as PNG so that someone with Photoshop could confirm if that's what it renders there.
Answering to myself. Duotones are basically grayscale where you choose the inks (1 to 4) which will be used to actually represent shadows, midtones and highlight (and these can be random colored inks so that's not necessarily gray images). https://helpx.adobe.com/photoshop/using/duotones.html
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