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ING-COLOR-SPACECritical Ingestion Error

Interior Images in CMYK Color Space Instead of sRGB

An image inside the EPUB is encoded in print CMYK color space.

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Fix all ING-COLOR-SPACE errors in your EPUB automatically

PreFlight converts image pixel data through an in-browser sRGB Canvas context, rendering compliant sRGB color output automatically.

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What This Error Means in Plain English

If you or your formatter copied images from a print paperback layout (InDesign), they might be saved in CMYK print colors. Screen devices cannot display CMYK properly, causing inverted neon colors or crashing e-readers.

Why Retailers & EAA Regulations Block This File

EPUB 3 specification forbids CMYK color profiles in core raster image formats.

Technical Specification: All JPEG and PNG images in an EPUB must use the sRGB color space. Images with CMYK color profiles fail distributor checks.

Manual Fix Instructions (for Sigil / Calibre)

  1. Open the image in Photoshop or GIMP, convert color profile to sRGB, and re-export as JPEG.