Prismap - Gradient Map for Aseprite

Paint once, recolor infinitely.

Prismap adds a Gradient Map command right to Aseprite's Edit menu. Point it at any layer and it recolors the art by brightness through a gradient ramp you can make and control . No manual recoloring required.

I made this because I got tired of two things: never having my gradient ramps saved somewhere I could actually see them, and having no fast way to recolor a sprite through those ramps. I'm working on two games right now, and being able to just swap to the ramps I use constantly saves me a stupid amount of time. So I built the tool I wanted.

What it does

• Luminance-based recoloring - shadows, midtones, and highlights map onto the colors of your ramp automatically. 
• Live preview window - see the result before you commit; it follows your active layer, frame, and selection.
• Non-destructive - always applies to a new layer above your original. Your source art is never touched.
• Smooth or hard-band - blend colors smoothly, or flip to hard steps to ensure strict color guides.
• Selection-only mode - recolor just what's inside the marquee, leave the rest alone.

Build your own library

• Full ramp editor - add, move, recolor, and sample color stops (up to 8) on an interactive grayscale bar.
• Organize into sets - group ramps however you like: by material, by character, by mood.
• ⭐ Favorites - star the sets you reach for most and they jump to the top of the list.
• Import / Export - share ramp libraries as JSON.
• Bundled starter library - ships with ready-to-use sets: Metal, Nature, Element, Sky, Value, Skintone.

Made for real workflows

• Palette swaps and recolor variants in seconds
• Fast cel-shading and value studies
• Consistent lighting/mood across a whole sprite sheet (maps every frame)
• Turning a grayscale value pass into finished color

Prismap's code was built with AI assistance. All artwork and design are hand-made by me. All testing, refinement, and direction were mine. Made by Shrine (me) and Glyph (the resident Starboy).

What's included

• The Prismap extension (.aseprite-extension) — one-click install
• 6 bundled gradient sets to start from
• Built-in Help and About, right in the tool

Requirements

• Aseprite v1.3 or newer (Lua scripting + extensions)
• Works on RGB sprites

How to install

1. Download Prismap.aseprite-extension.
2. In Aseprite: Edit ▸ Preferences ▸ Extensions ▸ Add Extension, pick the file.
3. Find it under Edit ▸ Gradient Map (Prismap). That's it.