A black & white IngramSpark title is a grayscale title. That sounds like a description; it's actually a file spec. Lightning Source prints B&W books from grayscale data, so the interior you upload for a B&W book should contain grayscale only: black text built from black, images as true gray values. Files built in RGB or CMYK color — which is what most tools export by default — get converted on Ingram's side, and the conversion is where B&W books go muddy.
What goes wrong, concretely
| What's in your file | What the conversion does |
|---|---|
| RGB black body text | Converted to a gray value that may not be full black — text prints lighter and softer than you proofed on screen |
| “Rich black” (CMYK mixes) from a design tool | Flattened to a single gray — backgrounds and panels can land at visibly different darkness than intended |
| Color photos in a B&W book | Converted to grayscale by formula: saturated reds and greens can collapse to nearly the same gray, draining contrast from faces and diagrams |
| Color chapter art / accents | Print as gray — sometimes a surprise if the author expected the one “color” element to survive |
If the pages are meant to print in color, the fix is not a better grayscale file — it's a different title setup: the book must be set up as a color interior (IngramSpark's Standard or Premium color), with its own print cost. A B&W setup will never print color, no matter what the file contains. Color interiors that bleed need 0.125″ of bleed on the three outer edges (never the gutter) — see our bleed guide for the shared geometry.
Set it up right
- Text: build body text as true black (100% K / grayscale 0). Avoid RGB black and four-color “rich black” anywhere in a B&W interior — one ink is what the press is running.
- Images: convert photos and art to grayscale yourself, where you can see and adjust the contrast, instead of letting a server-side conversion choose for you. Check mid-tones: faces, skies, and diagrams are where conversions lose detail.
- Resolution: grayscale images follow the same 300 DPI-at-print-size rule as everywhere else (see the resolution guide).
- Proof it: print one chapter at home with your printer set to grayscale. It's a rough proxy for the plant's conversion — if it looks muddy on your desk, it will look muddy from Lightning Source.
Converting, per tool
Photoshop: Image > Mode > Grayscale, after adjusting contrast in color (Channel Mixer/Black & White adjustment first if a photo matters). Acrobat Pro: Print Production > Convert Colors can convert a finished PDF to grayscale — verify page by page afterward. InDesign: build with grayscale swatches and export with a gray output destination where your workflow supports it; at minimum, pre-convert placed images. Word, Pages, Canva: these export color PDFs — the document can be perfectly black-and-white looking while the file still carries color data. For a Word-built novel of pure text the practical exposure is small; for anything with images, convert the images to grayscale before placing them and let the free check below confirm the file.
Our free check reads the file the way the plant does — color data in a B&W interior is one of the things it reports, along with the other 12 KDP + IngramSpark checks, in plain English within 48 hours. Get the free check →
The honest limit
Grayscale conversion is one-way. Once color art has been flattened to gray, the color information is gone — a later move to a color edition means going back to the original color files, not re-coloring the PDF. Keep your color masters, always, even for a book you swear will stay black & white forever.
Or send us the files — the check is free
Email your interior and cover PDFs and we'll tell you exactly what's wrong — in plain English, free, within 48 hours. If it does need fixing, the by-hand fix is $19 and we redo it free if IngramSpark rejects it for a formatting issue we were hired to fix. We rebuild files to be compliant with the platform's published spec — that's the promise we can keep.
Prefer the whole library in one file? The KDP Rejection Field Guide (free PDF) collects every guide, table, and the 13-point checklist.
More from the Help Library
- The KDP & IngramSpark Help Library — all guides & tools
- IngramSpark minimum margins — 0.5″ on every side
- Images below 300 DPI — effective DPI explained
- IngramSpark: your final page must be blank
- KDP vs IngramSpark — fees, reach, ISBN rules, using both
- Spine width calculator — KDP and IngramSpark math
- ISBN & barcode rules for KDP and IngramSpark
- The free rejection check — all 13 checks at once