How To Compare Quantitative Images

For a quantitative comparison between different signals or images, where the black and white levels are set to the same physical signal levels, set the same

Formula in the Formula bar
Minimum and Maximum values in the Range toolbar
Colour and inverse in the Colour toolbar

for both signals or images, as in the example inserted below. Note that Intensity Bars in the two images have the same range -2 nA to 5 nA.