1. Geometry, Resize & Cropping
2. Compression & Blur
3. Pixel Transformations & Flags
Parameter Syntax Cheatsheet:
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w / h: Target width & height in pixels (e.g. w=800&h=450)•
fit: cover (crops to aspect ratio), contain (letterboxes), fill (stretches), inside (shrinks within bounds)•
position: Crop gravity: center, top, bottom, left, right•
cw / ch: Center crop width & height before scaling•
q: Output compression quality from 1 to 100 (defaults to 85)•
blur: Gaussian blur sigma from 1 to 100 (recommended 2-10 for placeholders)•
rotate: Lossless exact pixel rotation (90, 180, 270)•
flip=h / flop=1: Mirror horizontally or vertically•
grayscale=1 & sharpen=1: Black-and-white conversion & unsharp edge sharpening