The ePUB export process changes colors in JPEGs placed in my InDesign document. Any idea why and if there's a way to avoid this?
Happens regardless of what seetings I select in the ePUB export dialog (except of course "Use existing image for graphic objects," which makes no changes to the graphics at all).
I do want to use InDesign for cropping and scaling the images. But I don't want InDesign to change the color values of the image.s
Have you tried opening those images on photoshop and re-exporting for web use to make sure you color profiles are correct for web?
The source image was generated using Photoshop's Save for Web tool. It uses the RGB color space and has an embedded profile: sRGB IEC61966-2.1. The image's background color is r197 g44 b47.
After ePUB export, the image has no embedded profile, and its background color is CHANGED to r167 g75 b72.
The actual color values are changed. Opening the image in Photoshop and re-exporting for web use after the fact makes no difference.
If you direct select the image, is sRGB listed as its profile in the Links Info panel? Also is your document’s assigned RGB profile also sRGB (Edit>Assign Profiles..., not the Color Settings RGB Working Space). And is the document’s Transparency Blend Space set to RGB.
I have the same issue. The color profile of the linked illustration is sRGB, and the assigned profile in InDesign is also sRGB. Once I do the export, the colors are paler and I lose a lot from the original RGB color values. It looks more like what would be a CMYK output. Transparency Blend Space is set to RGB
Do you have any idea why this is happening?
What PDF settings did you apply?
Thanks for your answer!
With EPUB export I don't get any PDF options, only this that could be related to the image export:
The other thing I guess could be related is the color settings of the doc, and here is what I have there:
Am I missing something?
It's a minor point, but never use Progressive format. It's an obsolete option from the very-slow-web days. Probably no effect one way or the other on color.
Photoshop Save for Web is possibly not the best choice, either. While EPUB is HTML-based, readers aren't browsers and rarely interpret things like color space the same way.
I don't think I've ever had significant color shift from ID export. In general, I'd try to put the source images in the same overall format and profile as the export, then adjust the colors.
ETA: are you looking at the actual JPEGs as embedded in the EPUB to see an actual values shift, or is this a reader/presentation issue? What reader are you using, and have you tried a few others for comparison?