AGG and PNG Output - no white background

[Flavio Hendry]

Hi Thomas / Group

Using PNG Output using AGG, the map background does not turn out white
(255,255,255) but in some greyish (250,252,250 or similar). Does not
really matter on screen, but is remarkable printing ... This no matter
if I use quantize or not. Same map using JPEG no problem.

Mit freundlichem Gruss / Best Regards
Flavio Hendry

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