Nvidia GPU required, issue didn't occur on Radeon.

Repro steps:
1. Open "Sands" project
2. Click on canvas > image in the hierarchy
3. In the image inspector click recalculate

Result: Editor freezes once clicked on recalculate

Reproduced on: 5.3.6p1, 5.4.0f1, 5.5.0a5

Note: The cause of the issue is located in "Height" script on line 41 when you read pixels outside of window bounds.