Proof the cover in grayscale before approving the ebook file. A colorful composition can lose its hierarchy when two different hues become similar gray values. The solution is often a local contrast or typography change, rather than a new illustration or a different genre concept.
Make the reader view a separate acceptance target
Keep a color master and create a grayscale review copy in an external editor. View both at a realistic cover size without zooming into details. The question is whether the book remains identifiable, not whether every decorative flourish survives.
Amazon KDP's preview guidance distinguishes color tablet and phone views from grayscale Kindle e-reader previews. Use the relevant external preview mode after uploading your ebook candidate. A desktop grayscale conversion is a useful early check, but it does not reproduce every device's rendering or lighting conditions.
Inspect three things in order
First, check the title. Its letters need a stable contrast relationship with the area directly behind them. A pale title crossing both clouds and dark trees can become uneven even if its average contrast looks acceptable.
Second, check the dominant shape. A doorway, face or landscape silhouette should separate from its background at a glance. Third, check the author line or series label. Supporting text can be smaller than the title, but it should not require magnification to recognize the information the cover is meant to communicate.
Do not sharpen the entire image just to darken the lettering. Keep exact cover text in editable type layers so that weight, placement and spacing can be adjusted independently from the art.
Worked example: an invented mystery cover
This planning example is fictional. A mystery novel uses a copper key against a teal door, with a thin cream title. In color, the key attracts attention because of its hue. In grayscale, its middle tone nearly matches the door and the cover becomes a dark rectangle.
The designer produces two revisions. Candidate A brightens the key's silhouette and creates a calmer dark patch behind the title. Candidate B keeps the color art unchanged but adds a heavy outline to every element. At small size, A preserves a clear title and one meaningful symbol; B introduces competing edges. The proof sheet records title recognition, key recognition and author-line readability for each candidate. These are editorial observations, not fabricated device measurements.
Check the uploaded book, not a loose image alone
Upload the intended cover and content through the external publishing workflow, then reopen the preview. Confirm that the correct revision is attached to the correct edition and that no old cover remains in the package. Use KDP's content-quality guidance as a final platform check rather than assuming that a clean standalone JPG proves the book is ready.
If a physical e-ink device is available, inspect the candidate there too. Record the model and viewing conditions so a later reviewer understands the scope of the observation. One device does not establish identical results across all readers.
Keep both appearances in the delivery
Deliver the color cover, grayscale proof and a note naming the selected revision. Avoid creating an unrelated monochrome cover that changes the book's promise. If the artwork needs simplification, Image Prompt can help create a quieter visual; exact title and author text still belong in an external layout editor. Approval should include the color storefront appearance and the grayscale reading-device appearance together.