/godot-asset-generator

Pixel Art Prompting Guide

Comprehensive guide to generating pixel art game assets with AI image APIs.

Core Principles

Pixel art AI generation requires specific prompting to avoid common issues like anti-aliasing, wrong resolution, and blurry pixels.

Essential Modifiers

Always include these modifiers for pixel art:

pixel art, 16-bit, clean pixels, no anti-aliasing, limited color palette,
retro game sprite, crisp edges

Resolution Modifiers

Negative Prompts (Replicate/fal.ai)

blurry, anti-aliased, smooth, gradient, realistic, 3d render,
photorealistic, high resolution photography, soft edges

Prompt Templates

Character Sprites

pixel art [character description], 16-bit style, game sprite,
[pose/action], [view direction], clean pixels, no anti-aliasing,
transparent background, limited color palette

Example:

pixel art knight warrior, 16-bit style, game sprite, idle standing pose,
front view, clean pixels, no anti-aliasing, transparent background,
limited color palette, medieval fantasy

Animation Frames

pixel art [character], 16-bit style, [animation] frame [N] of [total],
game animation sprite, consistent style, clean pixels,
transparent background

Example:

pixel art knight, 16-bit style, walking animation frame 1 of 4,
left foot forward, game animation sprite, consistent style,
clean pixels, transparent background

Tilesets

seamless pixel art tile, [description], top-down view, 32x32 pixels,
tileable pattern, game tileset, retro style, clean edges

Example:

seamless pixel art grass tile, green meadow with small flowers,
top-down view, 32x32 pixels, tileable pattern, game tileset,
retro style, clean edges

UI Elements

pixel art [element type], 16-bit UI style, game interface element,
clean edges, flat colors, retro game aesthetic

Example:

pixel art health bar frame, 16-bit UI style, game interface element,
red and gold colors, clean edges, flat colors, retro game aesthetic

Items and Objects

pixel art [item], 16-bit style, game item sprite, isolated object,
transparent background, clean pixels, iconic design

Example:

pixel art sword weapon, 16-bit style, game item sprite,
glowing blue blade, isolated object, transparent background,
clean pixels, iconic fantasy design

Provider-Specific Tips

DALL-E 3

• Excellent prompt following
• Tends toward higher detail - emphasize "simple", "limited palette"
• Use "pixel art style illustration" for more stylized results
• Request "transparent background" explicitly

Replicate (SDXL)

• Use negative prompts to avoid realism
• Models like kohaku-xl are good for stylized pixel art
• Set guidance_scale to 7-9 for pixel art
• Consider upscaling then downscaling for cleaner results

fal.ai (Flux)

• Fast iteration for testing prompts
• Works well with simple, direct prompts
• May need post-processing for clean pixels

Post-Processing Pipeline

1. Generate at 1024x1024 - Higher resolution gives more detail
2. Remove background - Use --remove-bg or --color-key
3. Downscale - Use --resize with --filter nearest
4. Palette reduction - Optional: reduce to 16/32 colors

# Example pipeline
deno run scripts/generate-image.ts --provider dalle \
  --prompt "pixel art knight, 16-bit style..." \
  --output ./raw/knight.png

deno run scripts/process-sprite.ts \
  --input ./raw/knight.png \
  --output ./sprites/knight.png \
  --remove-bg --resize 64x64 --filter nearest

Common Issues

Anti-Aliasing / Soft Edges

Problem: Pixels have soft, blurred edges instead of hard transitions.

Solutions:

• Add "no anti-aliasing", "hard edges", "crisp pixels"
• Generate larger, then downscale with nearest neighbor
• Use negative prompt: "anti-aliased, smooth, blurry"

Wrong Scale / Too Detailed

Problem: Image has too many tiny details, not blocky enough.

Solutions:

• Specify exact resolution: "32x32 pixels", "64 pixel sprite"
• Add "low resolution", "chunky pixels", "simple"
• Reduce after generation with nearest neighbor

Inconsistent Style

Problem: Multiple assets don't match visually.

Solutions:

• Create and reuse consistent base prompt
• Use same model and settings for batch
• Reference specific game/era: "SNES style", "like Stardew Valley"
• Post-process with same palette reduction

Gradients Instead of Flat Colors

Problem: AI uses gradients where flat color blocks are expected.

Solutions:

• Add "flat colors", "solid colors", "no gradients"
• Specify "limited color palette", "16 colors"
• Use negative prompt: "gradient, shading, realistic"

Resolution Guide

Always use nearest neighbor filtering when downscaling.

Color Palette Tips

Specifying Palettes

limited to 16 colors, [palette description]

Examples:

• "NES color palette, limited colors"
• "earth tones palette, browns and greens"
• "fantasy game palette, purples and golds"
• "monochrome blue palette with white highlights"

Common Game Palettes

Reference known palettes for consistency:

• "NES color palette" - Classic 8-bit limited colors
• "Game Boy palette" - 4 shades of green
• "PICO-8 palette" - 16 specific colors
• "Commodore 64 palette" - Specific retro palette

Example Prompts

Player Character (Idle)

pixel art adventurer hero, 16-bit RPG style, idle standing pose,
front view, brown hair, blue tunic, sword on back, game sprite,
clean pixels, no anti-aliasing, transparent background,
limited fantasy color palette

Enemy (Slime)

pixel art slime monster, 16-bit style, bouncy blob creature,
green translucent body, simple cute face, game enemy sprite,
front view, clean pixels, transparent background, cartoony

Environment Tile (Stone Floor)

seamless pixel art stone floor tile, medieval dungeon style,
top-down view, 32x32 pixels, gray cobblestone pattern,
tileable texture, subtle cracks, game tileset, clean edges

Item (Potion)

pixel art health potion bottle, 16-bit style, red liquid,
glass bottle with cork, glowing effect, game item sprite,
isolated object, transparent background, fantasy RPG item