You can also decide between white and black image dependig on background 
with this code

MEAN=$(identify -format "%[fx:mean>0.60?1:0]\n" 
/home/pi/partwhereclockshouldgoto.png)
if [ $MEAN -lt 1 ]; then
        # White
        clock_img=/home/pi/Clock/V4/$(printf CHDK_Uhr_%04d.png $minutes)
else
        # Black
        clock_img=/home/pi/Clock/V2/$(printf CHDK_Uhr_%04d.png $minutes)
fi


Am Donnerstag, 19. März 2020 07:43:14 UTC+1 schrieb Mikael Fredriksson:
>
> Great! Thank you!
>
> Mikael
>

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