Is it possible in Adobe Photoshop, via Adjustment Layers or Scripting or some other means, to enable an alternate processed view of the working document?
Ideally some kind of two-up view, where the alternate view is visible alongside the main document and updates in realtime. But a keypress/buttonclick to toggle between views would work too.
To give an example, say my working file is a 16x16 RGB icon. I want to edit the file at 16x16 in RGB, but I want a quick preview available of how it would look at 64x64, grayscaled and thresholded, with some 64x64 mask applied to it.
If it was simply converting to grayscale and thresholding, I could use adjustment layers and toggle their visibility on/off to get my preview. It's the upsizing and applying a mask at that size, which I don't know how to do.
Is it possible somehow, perhaps with scripting?