Hi Guillermo, hi again Massimo,
here is another short video this time the blue spiral M 101. I think the increasing coloration with closer distance is far better visible, here.
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Blue M 101 color increase+++++++++++++++++++++++++++++++++++++++++
What I do here in more technical terms, is to re-express RGB in terms of Saturation(S), Hue(H) and Value(V), and increase S with the brightness V up to a maximum that may be set with a slider. Since S=0 <=> grayscale image, the increase of S with Hue=const does not falsify the coloration.
Here is the setting panel that may be accessed with a click both from windowed and fullscreen displays...
[first click on image then hit your browser's fullscreen key (F11 in FF)]Attachment:
DSOcolorset.jpg [ 156.19 KiB | Viewed 5119 times ]
Cheers to the other side of the Equator,
F.
PS: I should add that I recently coded the preferences dialog in very flexible form: it is now
modeless and implemented into a
QDockWidget. The former implies that one may bring up the preferences dialog any time with a click and try out the settings in the main window without interruption. The QDockWidget feature remembers the dialog's last position and allows it to be floating, docked ... All key-shortcuts and commands work in fullscreen like in windowed mode. The toolbar with the toolbuttons at the bottom and the menubar at the top of the main window appear on demand via mouse events.