deirdre
Senior Member.
Gimp is similar to Photoshop but free to download.How did you do that? I might want to fool around with it a bit more.
https://www.gimp.org/downloads/ (i always pick "directly" but i have no idea why)
your pic -i am using- is a bit crooked (see white edge in lower left).
you can google anything (like i had no idea how to add or edit a grid, so googled "gimp add grid overlay")
basically "File>Open" pic in gimp.
under "view" make sure 'show grid is checked', then under image you can configure the size of the grid squares.
ps to see how many pixels your image is (to do grid math), click "Image>Scale Image" and it will tell you.
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