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Try using this: contrast-augmenter

The theory is that there is a bug somewhere on the image pipeline (there was a topic explaining that), if i'm not mistaken the imageshow is using the 8 LSB and the checkerboard is using the 8 MSB, so you need to shift the bits to transform the LSB in MSB. The node that i liked does that for you.

Don't forget to make that the new input to the camera calibration program

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