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Splitscreen Viewer#463

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PedroVillegas wants to merge 2 commits into
Tom94:masterfrom
PedroVillegas:splitscreen
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Splitscreen Viewer#463
PedroVillegas wants to merge 2 commits into
Tom94:masterfrom
PedroVillegas:splitscreen

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@PedroVillegas

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Hi Tom,

As indicated by the title, this PR adds a splitscreen viewer when overlaying images as an alternative to the error metrics. Simply overlay two images, toggle the 'splitscreen' button then click and hold the right mouse button to drag the slider across the images. I encourage you to test it out in case you are interested in the feature.

image

Note: I have left out the implementation for the metal shader as I don't have a machine to test those changes.

Pedro.

@Tom94

Tom94 commented Jul 22, 2026

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Hi Pedro, thanks for the PR!

I think I'll pass on the feature for now -- AFAIK, according to studies, flipping back and forth between images makes differences easiest to detect. (And my own perception seems to agree on this.) Basically, I don't see a point in having split-screen (or side-by-side) views if flipping is an option.

I'll leave the PR open for discoverability, though, if you don't mind.

EDIT: that aside, the PR would also need implementations for the histogram, the pixel value overlay (when zoomed far enough in), and image save / Ctrl+C in order to get merged. All that extra special casing maintenance overhead is part of the reason I'm hesitant to just merge anyway.

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