bitmaps are sometimes inverted

[AberDerBart]

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I tried rendering bitmaps, but in some cases the result was inverted. Here is an example containing the source monochrome bitmap and the generated header file: example.zip

[daschr]

Currently, the library will draw all black pixels (see https://github.com/daschr/pico-ssd1306/blob/main/example/test.bmp). Your keyboard example uses black as the background color and white as the foreground. You may negate the bmp before embedding it (f.e using imagemagick and convert keyboard_24_16.bmp -negate keyboard_24_16_negated.bmp).

One could also add an option to draw the image negative.

[AberDerBart]

There is code in the bin2c tool that handles foreground and backgroud colors but somehow it does not work for my image, so I guess that is a bug in bin2c

[AberDerBart]

ah okay, I did not understand you correctly, because my head was stuck in thinking that the white pixels are the illuminated pixels - I can work with that, thanks