It's typical.

The histogram on the camera is one rough approximation of the data  
shape driven by the preview JPEG, the histogram in Lightroom is its  
interpretation of the RAW data itself. There are no standards that  
either can be judged by.

I've learned how to interpret the histogram function (and saturation/ 
underexposure blinkies) for each of my cameras using Lightroom and  
Camera Raw histograms as a reference. I push the JPEG rendering  
settings around to get them as close as possible, but they're never  
exactly aligned.

Actually, most of the time I just ignore the review playback on the  
camera entirely these days. I know how each of my camera's metering  
systems works well enough that I just set the exposure per what I  
think is right and live with the consequences *most* of the time. I'd  
rather spend my time concentrating on what I'm shooting than whether  
the histogram looks pretty... :-) But I do use it now and then to  
check if I'm in the right ballpark.

Godfrey


On Apr 30, 2008, at 5:34 PM, Rick Womer wrote:

> =Why= am I asking this question, just four days from
> my K10D's first birthday and the expiry of its
> warranty?
>
> Anyway...
>
> I've been looking at the histogram on the camera more
> lately, and noticed that it usually does not
> correspond to the histogram in Lightroom.
>
> So, I set the camera according to Godfrey's
> recommendations of several months ago.  Not much help:
>  in B&W, the image on the camera's LCD and histogram
> is about 1 stop brighter than the image and histogram
> that Lightroom gives me.  In color, there is more
> variation, with the histogram (and the "blinkies") 0.5
> to 1.25 stops brighter than Lightroom.
>
> This is something I can live with (rather than part
> with my camera for two weeks, and $150!), but I'm
> curious about whether it is typical or correctable,
> either in LR or in the camera.
>

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