[Feature] <title>Histogram Overlay Display Function

olive-groves / butterfly_viewer

Side-by-side image viewer with synchronized zoom and sliding overlays. Drag and drop to instantly compare multiple images on your desktop. Very open source.

https://olive-groves.github.io/butterfly_viewer/

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[Feature] <title>Histogram Overlay Display Function #66

Open CainsLee opened 5 months ago

CainsLee commented 5 months ago

Is there an existing request for this feature?

[X] I have searched the existing issues

Is your feature request related to a problem?

Add histogram display in the corner area of each photo when comparing photos

Describe the solution you'd like

Describe alternatives you've considered

No response

Anything else?

No response

larsmaxfield commented 5 months ago

Neat feature. A few questions @CainsLee:

What values should the histogram use for RGB images? Average RGB? Maximum RGB? Or perhaps show the three channels separately?
Which area should the values come from? The whole image? The area in view?

I likely won't get to this soon, but it does give me another reason to add more analytical image comparison features.

CainsLee commented 1 month ago

Thank you for your reply.

Generally, using the color perception brightness formula Y = (R299 + G587 + B*114) / 1000 is sufficient to obtain the brightness.

These values derived from the entire image are already excellent. If you could provide a switch that allows real-time calculation of results based on the magnified ROI (Region of Interest), that would be even better.

Thank you for your efforts.