Exporting histogram values

I found out that the laser operates with ‘laserGRBL’ language and streams that from the controller to the laser module in ‘Gcode’. I can extract the gcode sbtract all except ‘S-values’ which are power%…Which is really Exposure time, given in sequence relative to the x/y grid and laser travel…

Then I have both lists to cross compare and selectively change tones for ones that lase better in appearance or are beyond my Black/White point.

Gimp can also indicate the area of those pixel values using mouse pointer on the image.