(03-05-2019, 09:02 AM)Pieter Johan Botha Wrote: Am I right assuming that when I open a photo as layer that the original photo is safe from any changes made on the layer?Yes and No. The image is held in memory so the original (as a file on disk) is unaltered providing you do not export / save using the same file name / file format
But over the years many horror stories from users not paying enough attention.