Changing image data of a canvas has not effect

The following code has no effect. Any idea why ?

ImageData imageData = context2d.getImageData(0, 0, 100, 100);

for(int j = 0; j < 100; j++)

for(int i = 0; i < 100; i++)

imageData.setRedAt(255, i, j);

Thanks,

Omar

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