I made this grid, marking every 25 pixels from the top left corner with a blue line at the same resolution as full size images drawn in Sketchbook Mobile on an iPhone 3GS. Just add this image to your Photo Library on your iPhone or iPod touch and import it as the initial layer of a drawing to use it as a guide. Hope this helps some of you with plotting more detailed drawings! Full size original PNG of this file is available on my blog…
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