I want to divide a picture into 640 equal, imaginary squares in order to recreate the picture in a game similar to Minecraft. Can someone help me how or where I can do this?
I would use Gimp for that. A graphics program on par with Photoshop, but free and open source. A grid can be created under Filters / Render / Pattern / Grid. You have to specify the size of the box, a simple little arithmetic problem with the pixels of the image.
Edit: I thought to myself, if I recognize your intention correctly, something is definitely prefabricated for Minecraft… So if you want a quick result: https://minecraftart.netlify.app/editor
Thank-you! You have helped me a lot.