GeneralisedHyperbolicStretch V2.1.0

Pixinsight script designed to provide an integrated environment to design, appraise and apply stretches to astronomical images. Version 2.1 adds additional functionality including the following:

All stretch parameters now stored in iconised process instance stored in a view's history.
Reset button for LP, SP and HP (and BP, WP for linear stretches) will now reset to histogram readout value if one is selected, otherwise to default value.
Added ctrl-click (cmd-click on a Mac) toggle between target view and preview.
Added control in preferences over maximum zoom for histogram.
Added new stretch visualisation using a greyscale mapping below the histogram.
All three channels are now charted in the stretched histogram even when a single channel is stretched - with single channel brought to front.
Added checkbox to disable/enable "invalid preview" cross.
b slider now runs from -5 to 15.
Parameters stored in script instance now store a single variable (channelNumber) value 0-6, defining which channel to operate on.
Validity checks added on stretch parameters before stretching, to catch if user has manually edited invalid values in script instance.
Stretch log now records just channel number and name rather than true/false indicator for all channels.
Image blend can now blend a monochrome image into each RGB channel of a colour target image.
Added more console messages,including feedback while new target image is loaded, to describe processes undertaken and reviewed previous messages.
Report PixelMath expression coefficients in the process console.
Enable channel selection when no target image is selected.
If current settings for histogram colours and type differ from the default, these are now correctly reflected when the preferences dialog is opened.
Low clipping point and high clipping point now calculated by reference only to selected channel when a single R, G or B channel stretch is selected.
The colour of the "invalid preview" cross is now picked up correctly when the user has selected something other than the default.
Clicking on the preview without moving the mouse no longer activates the zoom function.
Bug when running Image Blend transformation from script instance icon fixed.
Fixed histArray warning on Windows machines.
Show mask checkbox now disabled if there is no target image selected.
Fixed bug in calculation of histogram endpoint in histogram information control.
Fixed bug on calculation of transformed readout point in Image Inspection dialog for L*, Sat and Col stretches.
Disable controls in dialog while long processes are performed.