NB under DirectColor the output image will be greyscale.
Along the bottom of the box are the following buttons:
Note: this may take a few seconds the first time it is run. It is quicker to auto-scale HEALPix maps on input.
The suggested values will be overwritten if you make another tab current, but can be recovered instantly by clicking Autoscale a second time.
Long/Lat is not yet enabled for butterfly projections.
You can also specific the blink period (per tab, not total) in seconds, and choose to omit the scale bar, which can be distracting if it differs between images.
Click the Done button to start blinking immediately. Otherwise click Cancel.
At present there is only one option:
For three channels you get a hue-saturation-value (HSV) plot where hue is angle, saturation is fractional polarization and value is Stokes I. Saturation is a linear scaling of fractional polarization from zero to a maximum you set in the dialog box. For both HV and HSV the channel mapped to "value" uses the same scaling as already set on its original tab, if available. For option (1) HV plots, the value (pol intensity) is calculated on the fly and you get linear scaling from zero to a maximum set in the dialog box.