Hello, I have found that the order in which I call plsetopt() matters. Using 
plsetopt("drvopt","8bit") before plsetopt("geometry","800x600") makes PLplot 
forget about the 8bit option and use 24bit instead (I use the png driver). I 
have checked the png-files using pnginfoto determine if they are 8bit or 
24bit. Setting "geometry" before "8bit" works fine. On the command line it 
works either way. 

Best regards,
Torquil Sørensen

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