I was not able to reduce the apparently blown red areas with the
"recovery" slider but I was able to get what I wanted with "exposure".
Or maybe it was a combination of the two. In any case it wouldn't work
without reducing overall exposure.
Chuck Norcutt
On 9/9/2011 6:46 AM, Moose wrote:
> On 9/9/2011 3:06 AM, Chuck Norcutt wrote:
>> I'm currently evaluating PSE9 for a friend. As in full PS just use the
>> lasso or other selection tool to select an area. Then press CTRL-L to
>> show a histogram of that area. Use the pull-down menu to select views
>> of the individual RGB channels if desired.
>>
>> But being able to get a detailed view of the histogram in PS doesn't
>> address my concern.
>
> I understood. I was replying to Jim's question.
>
>> I want to see it in-camera so I know if my current
>> exposure settings will result in blown highlights.
>>
>> The 5D is getting pretty long-in-the-tooth as far as its small LCD
>> display is concerned. Maybe a more modern camera with 3" wide OLED will
>> show me what I want to know.
>
> I'm not so sure. The 60D is 3", although not OLED, and I don't think it's
> much, if any, better. Unless someone takes up
> your idea of enlarging the top end of the histogram, I don't think you are
> likely to find joy.
>
>> One thing I do not like about ACR is that the histogram and intensity
>> readouts do not show the headroom that is available in the raw file.
>> For example, yesterday, while working on photos of dancers under
>> strongly colored stage lights, the histogram and the cursor readout
>> (showing 255) told me that the red channel was blown in some parts of
>> the image. Yet, since it's a raw file there was still adjustment room
>> there. Adjusting the exposure downward allowed me to get the apparently
>> blown areas down to a max of 248. I want the ACR histogram to say 262
>> if there's adjustment room available.
>
>
> I'm not at all certain there is a way for the program to tell that, at least
> with any accuracy. Go back to the dpr
> review of the 5D. They compare highlight recovery by DPP, ACR and Rawshooter.
> <http://www.dpreview.com/reviews/canoneos5d/page23.asp>
>
> You'll see that ACR is willing to go further than the others in guessing from
> context what the right value might be. My
> experience is that sometimes it's pretty amazing what it can reconstruct and
> other times doesn't do well.
>
> I tend to watch the clipped areas of the image in ACR as I adjust Exposure
> and Recovery. If the histogram looks like
> it's recovered, but the areas that should be going to proper looking color
> get less bright, but stay neutral and don't
> develop tonal texture, it's not working and I might as well back off.
>
> The only hope is to select those areas in PS, select other areas that have
> the colors that should be there and do Match
> Color. But when all the luminance detail is gone, even that doesn't work very
> well. If the problem area is minor in size
> or significance, getting the color right, even if there is no detail, can
> help it not stand out as troublesome.
>
> Moose
>
> Moose
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