If you need to open PDF files or just want a decent image editing app that doesn't cost too much or require a subscription, there are plenty of options in the Mac App Store and elsewhere. All of these and 64-bit apps that work with macOS Catalina and beyond. See https://macmost.com/mac-photoshop-alternatives.html for links.
You can also watch this video at YouTube (but with ads).
See https://macmost.com/mac-photoshop-alternatives.html for links.
Hello,
how come GraphicConverter is not mentioned ???
It is superior to Acorn, Pixelmator, and Gimp for even professional photographers.
It has absolutely everything. And there is no useless stuff that is less used or not used at all.
GC is The Best. I'm a user since 2012 and will never replace it with anything. I use it for editing and enhancing vintage and not vintage graphics, illustrations etc. for my shop on Etsy and Rubylane.