imago

Image algorithms and color math for Go. The library packages use only the standard library.

m := pix.FromImage(src)                    // premultiply into floats
m, err := dpid.Resize(m, width, height, 1) // any scale/* package
out := m.NRGBA()                           // un-premultiply, quantize

Packages:

• scale/{box,resample,dpid,perceptual,l0,contentadaptive} downscaling
• scale/pixelate downscaling with a palette, quant palettes, dither ordered dithering
• pix float image, chroma color spaces, chroma/nrgba color helpers
• filter, pixelart, retarget/seamcarve, metric/ssim, enhance/sketch

Each package documents its own usage and cites its paper.

There is also a command line tool:

go install github.com/loov/imago/cmd/imago@latest
imago resize dpid --width 64 input.png output.png

MIT licensed.