Malk wrote in post #4524641
Im also having trouble finding a guide to making a 100% crop in photoshop or any of the Canon editing tools :/
Click on the Crop tool in PS. In the pulldown of the top tool menu, choose 'Fixed Size'. In the two boxes that appear in the tool bar at the top, type '800 px' in each for width and height. Click on your image and an 800 x 800 pixel box will appear. Move it to where you want, then crop it. That's an 800x800 pixel crop. Save as a jpeg less than 100 kb in size and you're ready to upload.
When making a 800x800 crop in DPP and save the file its still 3888x2592, do i just resize that to 800x800?
Resize so that the 3888 is 800 px, then just make sure aspect is preserved and the 2592 will automatically be calculated. That would be a full-frame crop.