Histogramm graph does not change

Issue #946 closed
ChristianR created an issue

Description
1.11 nightly #158

I use a Canon EOS 6D DSLR camera with L-Pro filter (where blue channel is brighter than the others).

In the statistics tile in the imaging view, statistics (numbers) are updated after each exposure/snapshot but there is no big change in in the histogram. RGB channels are not shown separately.

Steps to Reproduce

DSLR shot with 4s and ISO 1600, another shot with 4s and ISO 25600. See screenshots attached. The high ISO histrogram should be more to the left (blackpoint) and wider. But the difference between both is minimal.

Expected behaviour

Histogram should better represent the distribution of pixels per range.
My Camera has 14bit depth. Could it be the histogram is calculated for 16bit?

RGB channels should be show separately.

Actual behaviour

Diagram remains almost static with different exposures

Comments (6)

  1. Stefan B repo owner

    The histogram does change when you compare the two images. It includes the raw data histogram of all pixels before debayering. Showing RGB channels individually is not planned.

  2. ChristianR reporter

    I’ve just made an over-exposed image to show what I mean. Please find attached Histogramm from Nina, irfanview and apt for comparison. Both for the same image.

    Is it possible the histogramm scaling in NINA needs some improvement for DSLR (14bit) camera?

    I can provide the 34MB .CR2 raw file via dropbox if it helps.

  3. ChristianR reporter

    After running into similar issues with Flat Wizard (I had to set the target to 25% to get a image with peak at 50%), I did some tests at daytime.
    Histogramm looks far more realsitic with DCRaw Rar converter now. I need to run additional tests during the night.

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