Hello to all mapmakers.

I have a question for those who use Photoshop as main mapmaking software.

I am usually drawing on 300dpi on a format A3 (sometimes smaller, sometimes bigger) and when i am finished i save the result as PNG. The problem is that mainly when i am dealing with coloured map, i end up with pretty big PNG file. Even when i am using the lowest file size setting during the export.

I am not sure now but i think that in the past i tried to flatten the image before save but it did not helped.

How do you save your finished maps? Do you take the big file, and downgrade the resolution for web preview or do you have some tips?

Thanks in advance for anything related to this issue.