That's a typical problem with a lot of bad BMP import/export tools if the
BMP header height is negative, the image is meant to be flipped, if its
positive, it isn't.
> Hi Pierre,
>
> Check if the dithering is enabled (#define dither), and try again with it
> disabled. This seems to not work for some people/systems.
>
> What type of system are you using to create the original BMP? I'm using a
> Windows PC. I don't know why your images may be flipped. You could always
> flip the image before converting it, but that's juts masking the problem.
>
> Regards,
>
> PJE
>
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