Alter Intensity Range for Dumping

This option is provided as a quick method of rescaling an image to make the most use of the available intensity range prior to producing a PostScript screen dump.

Adjust intensity range of which buffer ?

This entry specifies which buffer contains the image to be adjusted. Any buffer may be specified. The selected buffer will be made the current output buffer.

Base on Window or whole Screen ?

The adjustment process may be based on either a window within the buffer (<W>), or the contents of the entire screen (<S>)

Window Selection: Region to base adjustment on

If the adjustment is to be based on a window, then the window selection submenu will be produced to enable this. Further information on windows is available from [H Help] within the submenu.

Minimum: ### Maximum: ###

Degree of saturation: =1 => use whole range >1 => force limits to black or white <1 => under saturate Saturation factor ?

This entry specifies how saturated the adjusted image is to be. The intensities are adjusted in the following manner:

           p <-- 128 + Saturation*255*(p-Mean)/(pMax-pMin)

where iMin and iMax are the minimum and maximum intensities, Mean is the mean of pMax and pMin and Saturation is the saturation factor.

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DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996