"Chapter 13 - Bitmaps" is missing the subject "How to SAVE bitmaps"

[Emasoft]

Thank you Mr @charlespetzold for the "Chapter 13 Bitmaps" of your book. It is extremely useful and clear. The only issue that I have is that the chapter seems to cover only the half of the subject, specifically "how to LOAD bitmaps", but not the also very importat subject of "how to SAVE bitmaps". Saving images (both locally or sending them to a remote web stream) is a very common process (think about image caching, photo cropping and resizing, svg icons caching... all such activities require to SAVE and LOAD images from a temp folder or a remote stream) but it is not covered in your book. And dealing with stream downloading and caching threads, local folders, PCL External Storage paths and writing permissions issues can be hard. Can we hope to see such argument treated in full in your next revision of the book?