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_SaveImage less then 32BPP

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_SaveImage less then 32BPP
mdijkens Offline
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#1
02-17-2026, 12:47 PM
I've never ran into this, but it seems _SaveImage cannot save a PNG image with less then 32 bits per pixel?
I have a large image _NewImage(15000, 15000, 11) just black and white.
But saving it takes 22 seconds and is ~8MB
When externally converting to 1BPP PNG it is only 700KB

Is there a (fast) way to do this in Qb64pe ?
45y and 2M lines of MBASIC>BASICA>QBASIC>QBX>QB64 experience
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Messages In This Thread
_SaveImage less then 32BPP - by mdijkens - 02-17-2026, 12:47 PM
RE: _SaveImage less then 32BPP - by Petr - 02-17-2026, 04:09 PM
RE: _SaveImage less then 32BPP - by mdijkens - 02-17-2026, 04:36 PM
RE: _SaveImage less then 32BPP - by SMcNeill - 02-17-2026, 04:50 PM
RE: _SaveImage less then 32BPP - by Petr - 02-17-2026, 04:52 PM
RE: _SaveImage less then 32BPP - by ahenry3068 - 02-17-2026, 05:03 PM
RE: _SaveImage less then 32BPP - by a740g - 02-17-2026, 09:45 PM
RE: _SaveImage less then 32BPP - by SMcNeill - 02-17-2026, 04:46 PM

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