shadows

Thank you for asking, Blushock. I also wanted to know. What I get from the linked article is that interlacing makes the image load vaguely before filling in the details. A non-interlaced PNG will instead load from top to bottom. Usually, the image should not be interlaced (so keep the box in Paint.net unchecked). Exceptions for when interlacing might be desired: When the viewers have a very slow internet connection. You'll be displaying many large images at once. (My interpretation as someone mindful of the harm flickering images can do to light sensitive people who are on slow internet connections:) There's a strong need to reduce flickering. More experienced designers, is there anything else we should be aware of?

It's a standard Microsoft Windows pop-up message that says what I put in quotes. Anyway, I've found the problem. I needed to add Paint.net to the allowed apps list for Microsoft Defender's controlled folder access. May this thread help someone in the future.

I update to 5.0 today. Now when I go to save an image created from scratch in the program, I receive an error message: "File not found. Check the file name and try again." I've tried "Save" and "Save As", different formats, different names, and different destination folders. The error is the same each time, and it makes no sense.