IngramSpark's vague "LOW RESOLUTION IMAGES IN FILE" error is caused by individual embedded images below 150 DPI, even if your document is 300 DPI. BookReady finds exactly which images, where, and how to fix them.
The error you're seeing
LOW RESOLUTION IMAGES IN FILE: We recommend color and black and white images be 300 ppi. For line art, we recommend 600 ppi bitmap images. Note: Your files contain one or more items below 150 ppi.
This warning means an individual image embedded in your PDF, usually your cover art, a background texture, or a decorative element, is below 150 DPI at the size it's placed. BookReady checks every single embedded image and tells you exactly which one is the problem.
Step 1, Book specs (for spine width validation)
Step 2, Upload your cover PDF
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Checking your cover...
Scanning every embedded image for resolution issues
Your cover is ready to upload
Processed and verified for IngramSpark
⚠️ Image resolution cannot be auto-fixed, low-res images need to be replaced in your design tool before uploading. See fix instructions above.