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Are there any known size/space limitation of QPixmap and/or QImage objects documented? I did not find any useful information regarding this. I'm currently using Qt 4.7.3 on OSX and Windows. Particulary I'm interested in: Width/Height limits? Limits depending on color format? Difference between 32/64 bit machines? Difference regarding OS? I would naively suspect that memory is the only limitation, so one could calculate max size by width x height x byte_per_pixel I assume that there is a more elaborate rule of thumb; also 32 bit machines may have addressing problems when you run into GB dimensions. In the end I want to store multiple RGBA images of about 16000x16000 pixel in size and render them using transparency onto each other within a QGraphicsScene . The workstation available can have a lot of RAM, let's say 16GB. tl;dr: What size limits of QImage/QPixmap are you aware of, or where can I find such information? Edit: I'm aware of the tiling approach and I'm fine with that. Still it would be great to know the things described above. Thanks!

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