book-cover-design

book-cover-design

Book Cover Design

Create genre-appropriate book covers with AI image generation via inference.sh CLI.

Quick Start

Requires inference.sh CLI (infsh). Install instructions

infsh login

# Generate a thriller cover concept
infsh app run falai/flux-dev-lora --input '{
  "prompt": "dark moody book cover art, lone figure standing at end of a rain-soaked alley, dramatic chiaroscuro lighting, noir atmosphere, cinematic, high contrast shadows",
  "width": 832,
  "height": 1248
}'

Genre Conventions

Readers judge books by covers. Matching genre expectations is critical — a romance reader will skip a cover that looks like sci-fi, regardless of content.

Fiction

Genre Palette Imagery Typography Mood

Thriller/Mystery Dark (black, navy, blood red) Lone figure, urban scenes, shadows Bold sans-serif, all caps Tense, ominous

Romance Warm (pink, red, gold, soft purple) Couples, flowers, scenic backdrops Script/cursive, elegant serif Passionate, dreamy

Sci-Fi Cool (blue, teal, purple, silver) Space, tech, geometric shapes Clean sans-serif, futuristic Vast, technological

Fantasy Rich saturated (emerald, crimson, gold) Swords, magic, landscapes, creatures Decorative serif, ornamental Epic, magical

Literary Fiction Muted, sophisticated Abstract, minimal, symbolic Elegant serif, understated Thoughtful, artistic

Horror Dark with high contrast pops Faces, shadows, isolation, decay Distressed, bold, dripping Dread, unease

Historical Sepia, muted period-accurate Period clothing, architecture, artifacts Classical serif Nostalgic, authentic

Non-Fiction

Category Style Imagery Typography

Business/Self-help Clean, bold, 2-3 colors Minimal or none, icon optional Large bold sans-serif title

Memoir Personal, warm Author photo or atmospheric scene Mix of serif and sans

Science/Academic Professional, structured Diagrams, abstract visuals Clean serif, structured layout

Cookbook Appetizing, bright Hero food photograph Warm, inviting fonts

Travel Vibrant, aspirational Destination photography Adventure-style fonts

Cover Sizing

Print (Trim Sizes)

Format Dimensions Common For

Mass market paperback 4.25 x 6.87" Genre fiction

Trade paperback 5.5 x 8.5" Most fiction/non-fiction

Standard 6 x 9" Non-fiction, textbooks

Large format 7 x 10" Coffee table, art books

Digital

Platform Cover Size Aspect Ratio

Amazon Kindle 2560 x 1600 px (min 1000 x 625) 1.6:1

Apple Books 1400 x 1873 px minimum ~3:4

General ebook 2500 x 3750 px 2:3

Spine Width

Approximate: page count / 400 = spine width in inches (varies by paper stock).

• 200 pages ≈ 0.5" spine

• 400 pages ≈ 1.0" spine

Layout Zones

┌─────────────────────────┐
│     TITLE ZONE          │ ← Top 1/3: Title must be readable here
│     (largest text)      │    This is what shows in thumbnails
│                         │
│                         │
│     MAIN IMAGE          │ ← Middle: Core visual/illustration
│     ZONE                │    The emotional hook
│                         │
│                         │
│     SUBTITLE /          │ ← Bottom area: Author name, subtitle
│     AUTHOR ZONE         │    Smaller text, less critical at thumbnail
└─────────────────────────┘

The Thumbnail Test

Your cover will be seen at 80x120px on Amazon, 60x90px in search results, and ~40x60px on mobile grids.

At thumbnail size, readers must be able to identify:

• The genre (from color and composition)

• The title (if large enough)

• The mood (from imagery)

Test: shrink your cover to 80px wide. If you can't read the title or identify the genre, redesign.

Prompting by Genre

Thriller

infsh app run falai/flux-dev-lora --input '{
  "prompt": "dark cinematic book cover scene, silhouette of a person standing before a foggy bridge at night, single streetlamp casting long shadows, noir atmosphere, high contrast, desaturated blue tint, dramatic tension",
  "width": 832,
  "height": 1248
}'

Romance

infsh app run bytedance/seedream-4-5 --input '{
  "prompt": "romantic soft-focus scene, couple silhouetted against golden sunset on a beach, warm pink and gold tones, bokeh lights, dreamy atmosphere, soft pastel sky, intimate mood",
  "size": "2K"
}'

Sci-Fi

infsh app run falai/flux-dev-lora --input '{
  "prompt": "science fiction book cover art, massive space station orbiting a ringed planet, deep blue and teal color palette, stars and nebula background, hard sci-fi aesthetic, cinematic scale, clean geometric architecture",
  "width": 832,
  "height": 1248
}'

Fantasy

infsh app run xai/grok-imagine-image-pro --input '{
  "prompt": "epic fantasy book cover illustration, ancient stone castle on a cliff overlooking a misty valley, magical aurora in the sky, rich emerald and gold colors, detailed environment, sense of wonder and adventure",
  "aspect_ratio": "2:3"
}'

Non-Fiction / Business

infsh app run falai/flux-dev-lora --input '{
  "prompt": "minimal abstract book cover background, clean gradient from deep navy to white, subtle geometric pattern, professional and modern, negative space, corporate aesthetic",
  "width": 832,
  "height": 1248
}'

Typography Rules

AI cannot render text reliably. Generate the cover art/background with AI, then add typography in a design tool.

Title Hierarchy

• Title — largest, most prominent, top 1/3 of cover

• Subtitle — smaller, below title or at bottom

• Author name — bottom of cover, size depends on author recognition

Font Pairing by Genre

• Thriller: bold sans-serif title + condensed sans-serif author

• Romance: script/cursive title + elegant serif author

• Sci-Fi: geometric sans-serif for both

• Fantasy: decorative/medieval serif title + clean serif author

• Business: heavy bold sans-serif title + light sans-serif subtitle

Iteration Workflow

# 1. Generate 5+ concepts across different models
infsh app run falai/flux-dev-lora --input '{"prompt": "...", "width": 832, "height": 1248}' --no-wait
infsh app run bytedance/seedream-4-5 --input '{"prompt": "..."}' --no-wait
infsh app run xai/grok-imagine-image-pro --input '{"prompt": "...", "aspect_ratio": "2:3"}' --no-wait

# 2. Refine best concept with image-to-image editing
infsh app run bytedance/seededit-3-0-i2i --input '{
  "prompt": "make the sky more dramatic with storm clouds, increase contrast",
  "image": "path/to/best-concept.png"
}'

# 3. Upscale for print quality
infsh app run falai/topaz-image-upscaler --input '{
  "image": "path/to/final-cover.png",
  "scale": 4
}'

Common Mistakes

Mistake Problem Fix

Wrong genre signals Readers skip it Study bestsellers in your genre

Title too small Invisible at thumbnail Title should fill top 1/3

Too much detail Muddy at small sizes Simplify, use negative space

AI-generated text Garbled letters Add text in design tool

Centered everything Static, boring Use asymmetry intentionally

Following trends blindly Dates quickly Classic genre conventions endure

Checklist

• Genre instantly recognizable from colors and composition

• Title readable at 80px wide (thumbnail test)

• No AI-generated text on cover

• Works in both color and greyscale

• Correct dimensions for target platform

• Author name visible but not competing with title

• High resolution (300 DPI for print, 2500px+ for digital)

• Spine text readable (for print)

Related Skills

npx skills add inference-sh/skills@ai-image-generation
npx skills add inference-sh/skills@prompt-engineering
npx skills add inference-sh/skills@image-upscaling

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