https://github.com/zoomten/pil-palette-cycle
Palette cycling effects with Python + Pillow / PIL
https://github.com/zoomten/pil-palette-cycle
Last synced: 11 days ago
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Palette cycling effects with Python + Pillow / PIL
- Host: GitHub
- URL: https://github.com/zoomten/pil-palette-cycle
- Owner: ZoomTen
- Created: 2020-05-28T17:29:53.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2020-05-29T02:10:19.000Z (about 6 years ago)
- Last Synced: 2025-03-06T02:24:18.613Z (over 1 year ago)
- Language: Python
- Size: 5.86 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Palette Cycling with PIL/Pillow
A simple and terrible hack to make palette cycling effects using Python's PIL / Pillow. Python 3.
## Prerequisites
Install PIL and ArgParse:
```
pip install pillow argparse
```
## Files
**Base image** (`base_image.png`):
Use easily-distinguishable colors. The colors on the top left of the sample base image are only as a guide.
Make sure to save it as **PNG with alpha channel**!
**Palette definitions** (`colors.txt`):
```
base ff0000 ff0086 ec00ff 7700ff 0047ff 00c7ff 00f4ff 00ff7f 0e6f09 51cb00 b3cb00 cb9b00 cb5d00
dir left
cycle eefaff d8f5ff c0efff a4e8ff 8ee2ff 8de1ff 55d2ff 88e0ff 9fe6ff b6ecff d2f3ff e8f9ff ffffff
```
* The `base` command specifies which colors to use for the base palette, sequentially.
* `dir` tells the direction which the palette should cycle through
* `cycle` command specifies which colors to map to each entry specified in `base`. The amount of colors here **must** match the `base` colors!
## Generating the animation
Explanation of `palette_cycle.sh` follows...
Make a folder to dump the generated images:
```
mkdir palette_anim
```
Generate the images:
```
python cycle_colors.py base_image.png colors.txt palette_anim/_palette_anim
```
After this command is run, you should see a bunch of images in the `palette_anim` folder.
Create the animation (avi, gif):
```
ffmpeg -framerate 6 -i palette_anim/_palette_anim_%01d.png -c:v huffyuv -y -an _palette_anim.avi
ffmpeg -i _palette_anim.avi -vf "palettegen=reserve_transparent=0" -y _palette_anim_palette.png
ffmpeg -i _palette_anim.avi -i _palette_anim_palette.png -lavfi paletteuse -r 6 -y _palette_anim.gif
```
This first creates the avi, then makes a gif from the avi.
Remove the avi:
```
rm _palette_anim.avi
```
Remove the palette:
```
rm _palette_anim_palette.png
```
Remove the image directory:
```
rm -r palette_anim
```
## Result
