General discussion

Saturation point seems to vary depending on the subject/lighting

Submitted by Misters on

Forums: 

Hi

I've calculated the headroom of my highlights based on the tutorial on your website.

I'm getting inconsistent results though i.e. sometimes I'm clipping the highlights.

Several times I have done the headroom test and have measured my saturation point to be 13,284 (Green channel after the black point has been subtracted).

On a canon 5D3 I have done a few tests which measure around 3.5 - 3.7 EV headroom so I am using metering for + 3 1/3.

/offtopic, curiousity/ how big is the difference between

Submitted by deejjjaaaa on

Forums: 

how big is the difference between a matrix (not LUT) profile built using a sufficiently accurate shot of a measured target, with flatfield shot applied __vs__ a matrix profile that some people can build using the CFA transmission curves obtained with monochromator, etc (or when camera manufacturer like Kodak publish such curves)... I bet Iliah Borg did both ways for some cameras and compared, it is interesting to hear what was the outcome... how noticeable were the gains, etc

Profile Edition Question and General Question

Submitted by agblum on

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1) Does the Profile Edition permit custom white balance setting and export?
Added: I should clarify. Does the custom white balance require the use of a photo of a Color Checker Passport patch or similar tool? Or can a custom white balance area be selected from any photo?

2) What colour or colour space am I seeing when I look at the Raw Composite version of a photograph for which sRGB was set in-camera? (I'm not sure if I am properly asking my question here!)

Thank you.

Andrea B.
UltravioletPhotography.com

quality of ColorMunki measurements

Submitted by deejjjaaaa on

Forums: 

I can use a friend's ColorMunki spectrophotometer, but I was wondering if it is decent enough to measure a target, so for example, I made a fresh .cie today for QP 202 and compared vs .cie supplied with makeinputicc = http://postimg.org/gallery/2lny8xm86/

so - shall I try procure something better elsewhere and redo all my measurements or those results look normal (nothing out of the ordinary) ?

Crash

Submitted by JDługosz on

Forums: 

I got an invalid memory write when I went into Preferences and checked Masked Pixels and then Apply.
I saved a minidump w/ Stack, and the file is 412 megabytes. If I send that to you then you can view the crash in the Windows debugger (I suppose you are using Visual Studio 2010).

For completeness, note that I'm using RawDigger.exe 1.1.1.382, signed on October 13, size 1,670,936 bytes.

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