Scale Menu
The Scale Menu is used to set the upper and lower limits and the
distribution of colors, based on pixel values.
Linear
Set the colors distribution to Linear.
Log
Set the colors distribution to Log.
Squared
Set the colors distribution to Squared.
Square Root
Set the colors distribution to Square Root.
Histogram Equalization
Set the colors distribution based on a Histogram Equalization algorithm.
MinMax
Set the upper and lower limits to the min and max values, or 100%. The image
may be scanned to determined these values, based on the Min Max Options.
99.5% to 90%
Set the upper and lower limits to based on the specified percentage. A histogram
of the data is created and the limits are set to display the percentage,
about the mean value.
ZScale
Set the upper and lower limits base on the IRAF ZScale algorithm. ZScale
parameters may be configured via the preference menu.
ZMax
This is mix of MinMax, or 100% and ZScale. Set the lower limits base on the
IRAF ZScale algorithm and the upper limit to the max data value.
Scope
For FITS Mosaics, scope specifies if the limits are applied global across
each FITS Mosaic segment, or on a per segment basis.
MinMax
Specify how to determine the minium and maxium values of the image.
use DATASEC
If the keyword DATASEC is present, and this option is enabled, data
not in the bounding box specified by DATASEC will not be imaged,
printed, or used in calculations of MinMax and ZScale. The excluded regions
are usually bias strips on CCDs and contain no real data.
Scale Parameters
Invoke a non-modal dialog box to specify Scale Type, Scale Limits, and Scale
parameters.