Color picker not sampling exact colour under crosshairs in Color Equalizer module

[europlatus]

Describe the bug

I'm not sure how the colour samples are calculated using the color picker in the Color Equalizer module, but it doesn't seem to be accurate to the crosshairs. Perhaps it is calculating an average of the whole circle, but it still seems to have an offset.

In this example of a RAW file at 100% zoom, the crosshairs are clearly over the yellow colour, and the majority of the circle is also over the yellow colour, but the sample colour is a dark grey.

Should the sampled colour be directly under the crosshairs? This would be ideal.
If the current behaviour is as designed, could the weighting be adjusted to more accurately reflect the colour that the circle is mostly covering (e.g. yellow in the sample image above)?

Steps to reproduce

• Open an image file.
• Enable Color Equalizer, then click on the colour picker.
• Sample a color near another colour and move the reticle around to see how the sample colour changes under the crosshairs

Expected behavior

As there is already an "area select" mode for the colour picker, I think the crosshairs should be highly accurate for picking a hue. If this can't be done for some reason, the sample colour should more accurately reflect the colour that the crosshairs are hovering over.

Logfile | Screenshot | Screencast

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Commit

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Where did you obtain darktable from?

downloaded from www.darktable.org

darktable version

4.8.0

What OS are you using?

Windows

What is the version of your OS?

Windows 10

Describe your system?

No response

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

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