In the README file:
Min/Maximum Alarm Threshold – These setting are used to define limits for the difference in value between a pixel and its predecessor in the reference image. For greyscale images this is simple but for colour images the colours are averaged first, originally this used an RMS (root mean squared) algorithm but calculating square roots mugs performance and does not seem to improve detection. Using an average does means that subtle colour changes without any brightness change may go undetected but this is not the normal circumstance. There is also the option to use a more sophisticated integer algorithm to calculate a Y (or brightness) value from the colours themselves.
In the interface:
Minimum Pixel Threshold (0>=?<=255)
Maximum Pixel Threshold (0>=?<=255)
Not a huge thing, but it would be useful for beginners if both titles matched?
Documentataion - Interface mismatch
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