Color, and what each genre expects of it
Color arrives before shape, before the illustration resolves into an object, and long before anyone reads a word. It is the fastest signal a cover has.
It is also the decision authors make most personally. A favorite color. The color of the coat in chapter nine. Those are reasons about the book, and the shelf is not asking about the book. It is asking what kind of book, in under a second, next to thirty competitors that already agree on an answer.
These are conventions, not rules, and every one has been broken by a bestseller — but you should be able to say why you are outside one.
Thriller and crime
Cold, high contrast, restricted. Black, white, and one accent — usually red, sometimes a cold blue or teal.
The accent carries the whole cover: one red word, one lit window, one figure. Domestic suspense runs warmer and softer, with room for a photographic sky or a house, but the discipline is the same. A thriller with a full-spectrum palette does not read as a thriller. It reads as a book made without looking at its category.
Romance
The broadest range of any genre, and the one where subgenre matters more than genre.
Contemporary and rom-com run warm and saturated: coral, sunny yellow, hot pink, bright teal, often as flat fields behind illustrated figures. Historical softens and deepens — jewel tones, cream, gold, fabric texture. Dark romance goes near-black with one red or one cold highlight. Romantasy borrows fantasy's palette wholesale. Small-town and cozy sit in warm pastels.
Getting the subgenre palette wrong is worse than getting the genre wrong. A rom-com palette on a dark romance brings in exactly the reader who will be upset by chapter four, and they write the review.
Fantasy
Deep and atmospheric: midnight blue, forest green, oxblood, black, with real depth rather than flat fields.
What marks the category now is the accent: metallic gold, copper or silver, or a luminous source inside the image — a lantern, a rune, a rift. Even without physical foil, covers imitate the look of it, because readers have learned that gold on dark means fantasy. Cozy fantasy runs much warmer and lighter; grimdark strips the color out almost entirely.
Science fiction
Cool and clean, in one of two directions. High key: white, pale gray, a lot of empty space, one saturated accent — literary, near-future and hopeful SF. Deep black: a single light source against near-total darkness — space opera and military SF.
Both are restricted. Science fiction tolerates less color than any fiction category except horror, and a warm, dense palette pushes an SF novel into fantasy before the reader reaches the subtitle.
In the Cover Maker. Try a palette against your real artwork at your real trim: title, series and author stay live vector text, so you can recolor the type, check it at thumbnail size, and change it back without re-exporting anything. Start a book → · about the Cover Maker
Horror
Near-monochrome, with one color that is wrong.
The base is black and gray, or one desaturated hue holding the whole cover. Then a single element intrudes in a color that does not belong: a sickly green, a wet red, a jaundiced yellow. The restraint is what makes the intrusion land. Two wrong colors is a poster; one is dread.
Literary fiction
Muted, and often a single flat field with one object or one piece of type on it: ochre, dusty blue, off-white, pale sage, brick.
The flatness is itself the signal — no gradient, no photographic depth, no glow. It says the book is about its sentences rather than its plot. Busy defeats it: a literary cover that acquires texture, a second image and a third color now reads as commercial fiction.
Memoir and nonfiction
Two workable answers, and they do not mix.
Photographic color, where a real photograph brings its own palette and the type is white or black over it — where narrative memoir lives. Or one confident brand color across the whole cover with the title set large, the answer for idea-led nonfiction and history.
The failure mode is the middle: a photograph plus three decorative colors plus a tinted band. Pick the photograph or pick the color.
Business and self-help
Flat, bold, high contrast, very few colors: one saturated field, white or black type, one accent. Orange, yellow, red and strong blue do most of the work.
The category reads decisiveness as competence, so a tasteful low-contrast business cover reads as tentative — the one thing the book must not be.
Children's books
Bright and saturated, and the one category where a wide palette is correct — picture books carry six or eight colors happily.
They still need structure: one area of the art must be quiet enough in value to hold the title. Middle grade dials the saturation back and adds black; YA is closer to adult genre palettes than to picture books.
The craft that outranks all of it
Three things matter more than any palette above.
Value contrast is what makes a title readable — color contrast is not. Two colors can be wildly different and sit at the same lightness, and the title will blur into the background at the size readers actually see it. Check in grayscale, every time: Color and contrast has the test and what it catches.
Two or three colors beat a picture containing every color. That restriction is most of what separates a designed cover from an accidental one. If your artwork arrived with twelve colors, pull the palette back rather than matching type to all of them.
The first color a reader sees is the background, not the type. The large field wins at thumbnail size, so choose it first and fit the type to it. Picking a title color and hoping the background cooperates is the wrong order, and it is the order almost everyone uses.
Make yours
Everything here is built into the tools, and they are free to use: name your book, bring your manuscript or your artwork, and work as long as you like. You only pay when you want the files without the preview watermark.
Next: Illustration or photography? · More: Color and contrast · Genre conventions: what your cover has to promise · Pairing typefaces on a cover