jande9
Senior Member
Does anyone know if it is possible to see a histogram of the luminance levels in the RAW file, before developing to JPEG?
Thanks
Jan
Thanks
Jan
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Histogram of RAW image.
- Thread starter jande9
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rick decker
Forum Pro
I would think that setting all sliders in SPP to 0, or the appropriate no/minimum impact, would be the closest way. The histogram has the three channels and a combined view (intensity).
carlos roncatti
Veteran Member
If im not mistaken, you have to use a uniWB...dont know if there is any available for sigma cameras for download
http://www.malch.com/nikon/UniWB.html
http://www.guillermoluijk.com/tutorial/uniwb/index_en.htm
Nicholas Johnson
Forum Enthusiast
I second that recommendation.
I third that recommendation. RawDigger is an excellent application.
cquarksnow
Leading Member
AFAIK, SPP histogram is for the jpeg embedded in the X3F file, and like the RGB values, is only 8bpc. That's why RawDigger is a blessing, especially when it comes to evaluating clipping, overexposure, etc...
Chris
Chris
rick decker
Forum Pro
Is the histogram of the data with 0 settings in SPP not a histogram of the RAW data
Thanks
R
Thanks
R
No, it is not. The raw data is converted to SPP's internal color space which I believe to be Kodak ROMM. What you see on-screen (after the medium embedded JPEG has been replaced), including both the histogram and the color-picker values, is dependent on what working space you select in 'preferences'.
Roland Karlsson
Forum Pro
You can use my X3F Tools. It can produce a histogram.
carlos roncatti
Veteran Member
rick decker
Forum Pro
With s/w that displays the RAW data histogram, does it present the RAW data including the histogram or does it just show you a histogram. If it does display the RAW data then I assume that the display has to be in some format to work with whatever color space is being used.
Thanks for the response.
Rick
Thanks for the response.
Rick
Hi Rick,
Referring to RawDigger the data is shown with the X and Y axis values according to the preferences that you set. Not too sure what you meant but it does not show the data as a huge list of values. It shows one histogram four each channel - 3 for us :-D
Both X and Y axes are in meaningful units can be auto, log, lin, EV, take your pick.
The raw values for early Foveons do not fit the comfortable "max is 12bits or 16bits". My X3F data shows hard saturation at about 10,000 - indicative of in-camera processing before writing to the raw file. Might vary from SD15 onwards.
It can show a RGB rendering, i.e. an image. Or a raw composite image. Or a monochrome representation of any one channel. Any can be exported to TIFF for further analysis, e.g. by ImageJ.
Didn't really get that assumption, sorry.
jande9
Senior Member
Thanks Roland. I am going out of town for a while but I will try that when I get back.
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