File: chunk-replace-gamma

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pypng 0.20231004.0-4
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#!/bin/sh

PATH=${PWD%code*}code:$PATH

pngnogamma () {
  priforgepng -d 2 glr rbr gtb -s 8 | priweavepng - - -
}

# Check no gAMA chunk first, then add one, replace it, and check again
pngnogamma | pripnglsch | grep -q gAMA && exit 9
pngnogamma | prichunkpng --gamma 0.45 - |
  prichunkpng --gamma 1 - |
  pripnglsch |
  grep -c gAMA | grep -q '^1$'