Image uses unsupported CMYK colorspace

eBay rejects images saved in CMYK colorspace. Error 21919010 means the source image must be converted to RGB before it can be used on the listing.

CMYK is the print colorspace, used by Adobe creative tools and many product-photography studios that produce assets for catalogs and packaging. Web browsers display CMYK inconsistently, so eBay enforces RGB. The same source file that prints fine will fail upload until it's re-saved.

1. Open the image in Photoshop or any editor and check Image > Mode.
2. Convert to RGB (sRGB IEC61966-2.1 is the safest profile).
3. Re-export as JPG or PNG and upload.
4. Add a pre-flight check to your image pipeline that flags CMYK files before they reach the feed.
5. Resubmit the listing once images are RGB.

• Re-using print-quality assets from the design team without colorspace conversion
• Trusting that a thumbnail downscaler preserved RGB - it doesn't always