blurhash
Blurhash is an algorithm written by Dag Ågren for Wolt (woltapp/blurhash) that encodes an image into a short (~20-30 byte) ASCII string. When you decode the string back into an image, you get a gradient of colors that represent the original image. This can be useful for scenarios where you want an image placeholder before loading, or even to censor the contents of an image a la Mastodon.
Installation
nimble install blurhash
Usage
Add requires "blurhash" to your .nimble file.
Encoding
import blurhash, imageman/[images, colors]
let
image = loadImage[ColorRGB]("image.png")
hash = image.encode(5, 5)
echo hashThis snippet hashes following image into this compact string: UrQ]$mfQ~qj@ocofWFWB?bj[D%azf6WBj[t7
Decoding
import blurhash, imageman/images
let image = "UrQ]$mfQ~qj@ocofWFWB?bj[D%azf6WBj[t7".decode[ColorRGBU](500, 500)
image.savePNG "blurred.png"This results in following image:
Other
Reference image author - https://rigani.me
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