libpng warning: iCCP android studio

AAPT: .... libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
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*** install dulu pngcrush dan optipng :
sudo apt-get install pngcrush optipng -y
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*** copy script dibawah ini dan simpan dengan dengan file extensi .sh
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#!/bin/sh
for i in `find . -name "*.png"`; do
    pngcrush -ow -rem allb -brute -reduce $i
    optipng -o7 $i
done
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*** berikan permission
sudo chmod +x namafile.sh
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*** eksekusi dengan cara :
./namafile.sh /lokasi/folderpng/
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done.