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CUTwC online image grid overlay

This page is designed to allow a perspective grid to be layered over a photo of a winks mat (use "choose file" to pick an image), in order to allow the game state to be described; see here for more, or this version to work with live webcam data. The image is not actually uploaded - everything stays in the browser. Drag the control circles to align the grid on with the mat in the upper image (the example is a really bad case - for your own images, try to get a more side-on view) and the lower image will show the corresponding area warped back to a regular grid.

This should work on a phone - just take a photo, open the page, and select the image you took (which on Android at least is likely the topmost option under "files"). This may be less of a faff than trying to transfer the image between a phone and a computer.

Note: Excessive warps may cause the second image to disappear - take a better photo.