Printing images with a low bit depth are converted to QImage::Format_RGB32 making them quite large

When printing an image with a low bit depth on Windows, the image will be converted to QImage::Format_RGB32 making it much larger.

A simple use case would be to print a high resolution monochrome image using Qt's Scribble example.

Inspecting the printer queue will reveal that the image takes up a large chunk of memory.

Printing the exact same image from another imaging program such as MS Paint with consume substantially less memory.

This is problematic if one is trying to print many low bit depth, high resolution images.