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Farbwerte im Histogramm Lightroom classic

Explorer ,
Mar 20, 2024 Mar 20, 2024

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Hallo,

leider sind die Farbwertangaben (RGB) im Lightroom Histogramm nur in Prozentwerten abzulesen, dagegen in Camera Raw und Photoshop in Dezimalwerten. Warum kann man das nicht einheitlich oder wenigstens optional wählbar machen? Oder gibt es ein workaround? Obwohl die Farbdarstellung in allen drei Programmen einheitlich ist, muss man sich immer mit einer extern erstellten Tabelle behelfen. Hat jemand eine bessere Idee?

Danke für Infos, RT.

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correct answers 1 Correct answer

Adobe Employee , Mar 20, 2024 Mar 20, 2024

<Right-Click> on the Histogram and uncheck "Show Values as Percentages"

Does that get you what you want?

 

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Community Expert ,
Mar 20, 2024 Mar 20, 2024

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It was a design decision made back when Lr was first released. Many, like you, have remarked that decimal values such as those used in Camera Raw would be bettter, but alas the idea has never been taken up by Adobe.

 

Note that there is an existing feature request along the lines you suggest. I expect this thread will be merged with that one at some point.

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Community Expert ,
Mar 20, 2024 Mar 20, 2024

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The reason is that in Lightroom Develop, the image has not yet been encoded into a standard color space. That's what would define numerical values. Numbers are color space specific.

 

It is in a color space (linear ProPhoto), but that's a non-standard color space that does not correspond to any scenario outside Lightroom. The histogram and numerical readout uses a special variety of that, where the linear tone curve is remapped into the standard sRGB tone curve - but the primaries are still ProPhoto (the latter is the one known as "Melissa RGB", presumably after the engineer who came up with it). So again, non-standard and not relevant outside LrC. 

 

In Camera Raw, the color space is defined in the workflow options. You could argue that the same applies to LrC when in soft proof, so it could show numerical values there. I don't know why it doesn't, probably for internal consistency.

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Explorer ,
Mar 20, 2024 Mar 20, 2024

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Thank you, D Fosse and Ian Lyons,
It's a shame that Adobe doesn't have a logical solution. As said, I'm using an external conversion table to help me visualise the values.

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Community Expert ,
Mar 20, 2024 Mar 20, 2024

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In my experience the readout does change to show 0-255 values per RGB channel for a given standard colourspace (e.g. sRGB) while Develop is set to Softproof, with Softproof set FOR that given representation. So that can be compared against a standard reference by the numbers.

 

Note: this is predicting what specific output you would get IF you exported assigning (say) sRGB - according to rendering intent - and not describing what the currently edited colours actually "are" within LR. The general editing within LrC as well as the percentage readouts seen without softproofing, are all output-neutral.

 

Whether the target colour numbers can be safely ASSUMED to be for sRGB, would need to be established too - but that's the usual norm AFAICT.

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Adobe Employee ,
Mar 20, 2024 Mar 20, 2024

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<Right-Click> on the Histogram and uncheck "Show Values as Percentages"

Does that get you what you want?

 

Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Community Expert ,
Mar 20, 2024 Mar 20, 2024

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I had missed that - but it's still not clear what color space those numbers refer to?

 

ProPhoto with linear tone curve, or sRGB tone curve?

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Adobe Employee ,
Mar 20, 2024 Mar 20, 2024

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My understanding is the color space remains unchanged (Melissa Pro Photo) but the numbers are translated from a 100% scale to a 255 integer scale. This scale is less precise but is available for those who can't get out of the 0-255 mindset. 

 

Rikk Flohr - Customer Advocacy: Adobe Photography Products

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Community Expert ,
Mar 20, 2024 Mar 20, 2024

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Got it, thanks. That makes sense -

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Explorer ,
Mar 20, 2024 Mar 20, 2024

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Thats it, I am grateful to you. I have not found any instructions for this anywhere.

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LEGEND ,
Mar 20, 2024 Mar 20, 2024

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[This post contains formatting and embedded images that don't appear in email. View the post in your Web browser.]

 

You can also change Photoshop's units to [0..1] (comparable to percentages):

 

johnrellis_0-1710949619270.png

 

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