8 operations for creative effects and image processing.
blur
Gaussian blur with configurable radius.
Code
/blur-10/ # sigma=10 blur
Range: 0.1–100.0
sharpen
Unsharp mask with fine control over flat and jagged areas.
Code
/sharp-1.5/ # sigma only
/sharp-1.5-2-10-20/ # sigma-x1-y2-y3
edge / emboss
Artistic filter effects with no parameters:
Code
/edge/ # Sobel edge detection
/emb/ # emboss relief effect
median
Noise reduction using median filter. Size must be odd.
Code
/med-5/ # 5x5 median filter
vignette
Darken edges for a cinematic look.
Code
/vig-0.3-0.7-000000/ # scale-opacity-color
noise
Add film grain or salt-and-pepper noise.
Code
/noise-0.2/ # gaussian noise
/noise-0.3-salt-pepper/ # mixed noise
Types: gaussian, salt, pepper, salt-pepper
pixelate
Mosaic effect for censoring or style.
Code
/pix-20/ # 20px pixel blocks