scott_rosenthal_7364331's profile

18 Messages

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424 Points

Fri, Dec 22, 2017 12:58 AM

Library Histogram Not Showing Clipped Whites; Develop Histogram Does Show Clipped Whites

I have a photo that has some clipping in the whites. The develop-module histogram shows a short vertical line at the extreme right, properly showing the clipping. Switching to the Library module, the histogram is nearly identical, however it's missing the vertical line showing the clipping! It's quicker to cull photos in the Library, but now I can't trust the histogram, so I can't trust I haven't blown out some whites. The histograms should be identical.

Responses

2.3K Messages

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26K Points

4 y ago

Neither histogram shows you a raw histogram. Any clipping scene is an attribute of the current rendering settings. While the two should match exactly, the most accurate indication of the data is always found within the develop module.

18 Messages

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424 Points

4 y ago

True, but that's not what I'm referring to. These are images that have had no development done to them--straight out of camera. The histogram on the left is from the Develop module. The right one is from the Library module. They both should be showing the same blown-out whites.

 

2.3K Messages

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26K Points

4 y ago

If raw, there's always some development. If JPEGs, that's what it is (I'd again judge in Develop). 

18 Messages

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424 Points

4 y ago

If culling through images was faster in the Develop module, that would make sense. But what use is it to have an incorrect histogram displayed in the Library module? Or better, yet, what's the advantage to having incorrect information shown as true information?

To me, it seems as if this issue isn't about raw, JPEG, straight-out-of-camera, etc., it's about something so basic in the histogram as if the pixels are saturated or not. It's almost like the Develop module displays 256 bins (0 to 255) and the Library module displays 255 bins (0 to 254).

Champion

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3.7K Messages

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61.1K Points

4 y ago

The histogram is based on the preview. Develop previews are in a special version of ProPhotoRGB, library previews are in AdobeRGB. Maybe that causes the difference you see, although one would not expect differences in clipping because of this. When I toggle between library and develop I often see slight differences between the histograms too.

18 Messages

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424 Points

4 y ago

Agreed that one shouldn't see differences in the histograms with clipping, if the data is clipped.

I looked at the raw file in a different program, RawDigger, which reports that there is clipping in all four channels (R,B,G1,G2)

I also, used ACR and changed the color space to all the available ones, and the histogram always showed the clipped whites, which is what one should expect.

My take is that I can't use the Library histogram to cull photos with blown whites, if that is important to me. I'd really like to hear Adobe's take on this.

2.3K Messages

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26K Points

4 y ago

You need to understand what the CURRENT Histogram is telling you! They lie too:

Everything you thought you wanted to know about Histograms

Another exhaustive 40 minute video examining:
What are histograms. In Photoshop, ACR, Lightroom.
Histograms: clipping color and tones, color spaces and color gamut.
Histogram and Photoshop’s Level’s command.
Histograms don’t tell us our images are good (examples).
Misconceptions about histograms. How they lie.
Histograms and Expose To The Right (ETTR).
Are histograms useful and if so, how?

Low rez (YouTube): https://www.youtube.com/watch?v=EjPsP4...
High rez: http://digitaldog.net/files/Histogram...

2.3K Messages

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26K Points

4 y ago

What we need is a raw Histogram as you see in Rawdigger but none exists in Adobe products.