[quote=142141:@Michel Bujardet]
As it stands, chances are unfortunately that the current RGB BMP file format used by Xojo will not do.[/quote]
Is there any format that can save Picture to greyscale or bitmap file in Xojo?
I have been searching and reading, but this is still unclear. Are all Picture file formats 24bit (I can find no info on how using SaveAsGif, if it is even working…)?
I am saving a bunch of A4 page size monochrome images to disk (in 600dpi, roughly 4000x7000 pixels), for later manipulation. SaveAsPNG takes about 3 seconds to save for each page, jpeg slightly less and that is a bit to slow to be comfortable when writing many of them. BMP is the fastest I can make work, but as it saves in 24bit, the filesize is huge, about 100MB each, which I don’t like. As I only use 1bit data it is quite silly to waste time and space writing 24 bit files…
Do I have to try writing the monocrome data to the files myself?
(Uncompressed gif:s seems doable. Maybe. BMP, not so easy…)
I am on OS X. What to do?