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.help trim Jan85 noao.imred.vtel
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NAME
trim -- Trim the limb. Zero all pixels off the limb in a full disk image
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USAGE
trim inputimage threshold
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PARAMETERS
.ls inputimage
Name of data image to trim.
.le
.ls threshold
Squibby brightness value to use as a threshold in determining the limb.
.le
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DESCRIPTION
Trim scans all the pixels in an image and sets those pixels to zero that
contain a squibby brightness smaller than the threshold value. This is
done in place, that is, the input image gets modified.
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EXAMPLES
1. To trim a data image called 'data' with a squibby brightness threshold
of 4 (the standard value) the command would be:
.nf
vt> trim data 4
.fi
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SEE ALSO
getsqib, putsqib
.endhelp
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