Drag the square around the image:

Adjust the numbers below the basis functions to make the image on the right.

The error value below shows how different the two images are. The goal is to make it equal zero.

Error: 0

Level 1 - the image can be made using just 1 basis function.

Press the help button to have 1 basis function set to the correct value for you.

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Original Image Pixels
Processed Image Pixels
That's correct!
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Basis functions