CMYK encoded jpegs are technically within spec ( https://www.itu.int/rec/T-REC-T.872-201206-I/en) but are exceedingly uncommon and support is pretty sporatic. Typically a JPEG contains RGB data encoded as YCbCr. If your application strictly requires CMYK data, you probably want to consider another file format.

Logan
From: Dennis Payne via WLUG <wlug@lists.wlug.org>
Sent: Sunday, November 15, 2020 8:22:01 PM
To: Worcester Linux Users' Group General Discussion <wlug@lists.wlug.org>
Cc: Dennis Payne <dulsi@identicalsoftware.com>
Subject: [WLUG] CMYK jpeg
 
Anybody know of an easy tool to convert an image into a CMYK color
space jpeg? I found an online site that works but would like to do it
on my machine. Searching has only found how to do it for tiff files.

--
Dennis Payne
dulsi@identicalsoftware.com
https://social.freegamedev.net/channel/dulsi
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