Colour/greylevel manipulation

A number of functions are available. The H= and I= functions works by clicking the butten and subsequently two points in the image, typically a dark point and a bright point. The functions are:

H=m(H): The hue of the image is generated as a rainbow scale from blue to red from the hue of the two points clicket.

H=m(I): The hue of the image is generated as a rainbow scale from blue to red from the intensity of the two points clicket.

I=m(H): The intensity of the image is generated as a grey-scale from black to white from the hue of the two points clicket.

I=m(I): The intensity of the image is generated as a grey-scale from black to white from the intensity of the two points clicket. This is the easiest way to enhance the contrast of a black&white image. Click the button, and then the area you want remapped to black, followed by the area you want remapped as white.All pixels darker than the first point becomes black and all points brighter than the second becomes white.

invert: Negates the image

Unfilter: Revert to original colour/graylevel map.

Satur +10% and satur -10% increases or decreases the colour saturation by 10% each time you press the button.