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Image Contrast Problems with "Update auto-contrast thresholds when histogram range is changed" #17

@karenacollins

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@karenacollins

I normally see it when MA is running, but I don't think I've seen it when simply using the stack play/animate mode. Using this partially clouded image stack, it seems that sometimes the contrast get off the peak of the histogram in some images. You may even be able to use the last 20 or so images.

To see the problem, download the linked stack, run MA with a single aperture on the middle star (probably doesn't matter which one or how many). I'm using these contrast settings and a non-virtual stack:

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At the end of the run, the image looks like the first one below, which is much darker than the starting setting. The setting is shown in the histogram below the image. You can compare to what the final image looks like in v3.4 with the same settings, which displays as expected.

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Simply clicking the auto-contrast icon above the image () returns the image display to the expected contrast (or scrolling the stack), but notice that the histogram is almost the same as above. I think possibly the contrast setting might be from the previous image, even though the histogram display is correct. The quickly changing clouds might be causing an underlying problem to show visually.

Here's the image after clicking the auto-contrast button:

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