Things that had been done ....

# 04 November 2020 :

On closing Colin a warning occured ... libpng warning: iCCP: CRC error ...

Problem :  libpng warning: iCCP: CRC error
           libpng warning: iCCP: known incorrect sRGB profile
           libpng warning: iCCP: xxxxxx
           
To remove the invalid iCCP chunk from all of the PNG files in a folder (directory), you can use ImageMagick's mogrify *.png,
provided that your ImageMagick was built with libpng16 (run " convert -list format | grep PNG " to be sure of that).

bash-5.0# mogrify *.png
mogrify: iCCP: CRC error `clazzes-logo-alpha_64x64.png' @ warning/png.c/MagickPNGWarningHandler/1748.
mogrify: iCCP: CRC error `eipg-logo-alpha_64x64.png' @ warning/png.c/MagickPNGWarningHandler/1748.
bash-5.0# mogrify *.png
bash-5.0# 
