IRAF help page for package proto, program imscale

from NOAO imscale -- Scale an image to a specified windowed meanUSAGE PARAMETERSDESCRIPTIONEXAMPLES

imscale -- Scale an image to a specified windowed mean

USAGE

imscale input output mean

PARAMETERS

input

Input image to be scaled.

output

Output scaled image.

mean

Scale the output image to this mean value.

lower = INDEF

Lower limit of window for calculating the input image mean. INDEF corresponds to the minimum possible pixel value.

upper = INDEF

Upper limit of window for calculating the input image mean. INDEF corresponds to the maximum possible pixel value.

verbose = no

Print the calculated input and output image means.

DESCRIPTION

The mean of the input image between the limits lower and upper is computed. The image is then scaled to the specified output mean.

EXAMPLES

To scale an image to a unit mean excluding deviant points below 1000 and above 5000. 

    cl> imscale calib flat 1 lower=1000 upper=5000

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