Gray value unit

Hello, I need a help. I have got a plot from a line plot profile of gray value vs mm. But I am confused what is the unit of gray value. I am getting values from 0.06 - 0.30 gray value.

Please help.

Dear @Sujon,

if you have not calibrated the images to a defined unit, pixel values don’t have a unit. To be on the safe side, you can check in ImageJ under Analyze > Calibrate if a unit is set.


Hello all, what is the unit of gray value.

I plot a line > plot profile > got gray value vs mm. Here, the set scale is 355 pixel/mm. Please help.