godot-fungodot-fun/godot-agent/.agents/skills/image-sprite-sheet-split/SKILL.md

image-sprite-sheet-split

Skill202 starsChanged 13 days agoMITView on GitHub

Splits uniform sprite sheet grids into individual frame PNGs using FFmpeg crop. Use when the user wants to split sprite sheets, extract animation frames, divide grid images into cells, cut 4x4 or NxM sheets, slice tilesets, or prepare frames for background removal.

1 other project uses a version of this.

Adopted by

Most recently taken up by

godot-fun/gaiword for word, first seen Nov 1, 2026

Other versions1 project uses a version of this.
Word for word · 1
godot-fun/gai★ 202100% same
Edited · 0
None found.
Wrote their own version · 0
None found.
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
In this repository37 other files it gives its agents.
- AGENTS.mdAGENTS.md
- .agents/skills/AGENTS.mdAGENTS.md
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- audio-denoiseSkill
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- audio-splitSkill
- audio-to-oggSkill
- audio-to-textSkill
- audio-to-wavSkill
- audio-trimSkill
- audio-volume-adjustSkill
- file-naming-normalizationSkill
- git-commit-messageSkill
- image-inpaint-regionSkill
- image-region-remove-key-color-appSkill
- image-remove-backgroundSkill
- image-remove-white-backgroundSkill
- image-resizeSkill
- image-to-pngSkill
- image-to-textSkill
- image-trimSkill
- storyboard-av-mixSkill
- storyboard-shot-to-htmlSkill
- storyboardSkill
- storyboard-ttsSkill
- video-4k-normalizationSkill
- video-compress-to-sizeSkill
- video-merge-gpuSkill
- video-mergeSkill
- video-publishSkill
- video-remove-audioSkill
- video-to-4kSkill
- video-to-60fpsSkill
- video-to-ogvSkill
- video-to-wavSkill

The file

We split this skill into the rules it gives an agent

5 rules. About 0 are common, 2 are distinctive, and 3 are very specific to this project.

≈0
Common · estimate
Many files like this have a rule of this kind.
≈2
Distinctive · estimate
This author's own choices. Worth a look.
3
Very specific
Tied to their project's names, files or tools. Probably skip.

Common
Distinctive
Very specific

Very specific:
When this skill applies, read and follow dependency-manager — run scripts as documented, install missing tools into .dependency/.
line 12
Very specific:
Run split_frames.py through the python manifest entry (.dependency/python/).
line 14
Distinctive:
Do not hand-write FFmpeg crop commands — use the bundled script.
line 15
Very specific:
Ensure python and ffmpeg are populated in .dependency/manifest.json (see dependency-manager).
line 24
Distinctive:
Use the bundled script, not hand-written FFmpeg crop commands.
line 91

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.

Files

SKILL.md

Image Sprite Sheet Split

Split uniform grid sprite sheets into individual PNG frames via FFmpeg crop. Preserves per-cell dimensions and alpha. Does not remove backgrounds — run image-remove-background on frames afterward if needed.

Rules

When this skill applies, read and follow dependency-manager — run scripts as documented, install missing tools into .dependency/.

Run split_frames.py through the python manifest entry (.dependency/python/). Never use host python, py, or python3.
Do not hand-write FFmpeg crop commands — use the bundled script.
Single file only. Pass one sprite sheet with --image; directories are not supported.
Grid size required. Supply --grid COLSxROWS before running (e.g. 4x4, 6x3).
populated: false is not a reason to skip. Install first, set populated: true, retry the same command.
Never overwrite sources. Output goes into <image-dir>/image-sprite-sheet-split/<sheet-stem>/ by default (or under -o).
Never copy or move input images. Pass the user's actual file path.

Setup (first run)

Ensure python and ffmpeg are populated in .dependency/manifest.json (see dependency-manager).
FFmpeg must include ffprobe beside ffmpeg in the same bin/ folder.

Quick Start

Default: <image-dir>/image-sprite-sheet-split/<sheet-stem>/ beside the input sheet:

# 4×4 sheet → image/effects/image-sprite-sheet-split/fire_sheet/fire_sheet_001.png … fire_sheet_016.png
.dependency/python/python .ai/image-sprite-sheet-split/split_frames.py --image image/effects/fire_sheet.png --grid 4x4

Custom output root:

.dependency/python/python .ai/image-sprite-sheet-split/split_frames.py --image image/effects/fire_sheet.png --grid 4x4 -o image/effects/frames/
# → image/effects/frames/fire_sheet/fire_sheet_001.png …

Defaults

Option	Default	Notes
`--image`	Required	Single sprite sheet image file
`--grid`	Required	COLSxROWS (columns first), e.g. `4x4`, `6x3`
Output	`image-sprite-sheet-split/<stem>/`	Use `-o` / `--output` for a custom root directory

Frames are exported row-major (left→right, top→bottom): _001, _002, …

Supported inputs: .png, .jpg, .jpeg, .webp, .gif, .bmp, .tif, .tiff, .avif, .ico.

When to use

Good fit	Poor fit
Uniform N×M grid (4×4, 3×6, 8×1)	Irregular / free-form layouts
Gemini or Aseprite-style sheets	Packed texture atlases with variable frame sizes
Sheets without gutters or border padding	Sheets with grid lines, gutters, or outer padding
Preparing frames for per-frame background removal	Auto-detecting grid size (must be supplied)

rembg on whole sheets removes animation content — split frames first, then remove backgrounds per frame if needed.

Agent Workflow

Confirm grid size — ask or infer from context (4x4, 3x6, etc.).
Trial first — split one sheet, inspect image-sprite-sheet-split/<stem>/001.png and the last frame.
Check warnings — if image size is not evenly divisible, verify cell crops still look correct.
More sheets — run once per file with the same grid settings.
Revert — delete the output folder; sources are never modified.

Examples

4×4 explosion sheet (2048×2048 → 16 × 512×512):

.dependency/python/python .ai/image-sprite-sheet-split/split_frames.py --image sheet.png --grid 4x4

6×3 sheet:

.dependency/python/python .ai/image-sprite-sheet-split/split_frames.py --image sheet.png --grid 6x3

Agent Notes

Use the bundled script, not hand-written FFmpeg crop commands.
Missing Python/FFmpeg → populate .dependency/ per dependency-manager, retry same command.
Do not copy, move, or replace the source with frame outputs — tell the user where the output folder is.
Need transparent frames → split first, then image-remove-background on each frame.

Troubleshooting

Issue	Fix
`FFmpeg not found`	Populate `ffmpeg` in `.dependency/manifest.json`
Directory passed to `--image`	Run once per sheet; this skill accepts image files only
Output already exists	Delete the existing frame folder or choose a different `-o` path
Wrong frame count	Verify `--grid` matches the sheet layout
Misaligned crops	Sheet may have gutters/padding — this skill expects a clean uniform grid
Unused pixels warning	Image size is not evenly divisible by the grid; inspect output frames
Need transparent frames	Split first, then image-remove-background on frames

CLI

Copy-paste commands: cli/image-sprite-sheet-split.md

Transparent cutouts per frame: image-remove-background
Trim frame borders: image-trim

Download now (ZIP)

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