Programs Help

[Sator]

Hi all! I'm new here customizing my windows appearence. I have used ResourceHacker to change certain aspects of themes. My question is what programs do you guys use to edit the *.png images like this one: https://i.imgur.com/hdm1jKj.png to change my windows frames? I have already tried Pixel Editor but it is a pain in the back to edit big images. All info is kindly welcome
:loving: