General discussion

OT? Is Canon's HTP (highlight tone priority) just digital or really changes RAW values?

Submitted by l_d_allan on

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My understanding is that Canon's HTP (highlight tone priority) really does change RAW values, and I've also read that it is just digital, so leave it off.

IIRC, the DPReviews of Canon DSLR's over the years have indicated that HTP does what it is supposed to do ... change the sensor's RAW response curve to increase RAW dynamic range at the cost of some noise (ISO 100 vs ISO 200).

I wrote to Canon tech support, and their reply was that HTP changed the sensor response curve for RAW, not just JPEG.

What is "best practice" for using RawDigger with MagicLantern's Dual-ISO?

Submitted by l_d_allan on

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Do you have one or more Canon DSLR's and installed the MagicLantern (ML) firmware? If so, have you used the Dual-ISO capability that merges different ISO's together for greater dynamic range? (my impression is there is a cost of some resolution for this).

I've taken series of images with a progression of shutter speeds, like ML's enhanced Auto-Bracket with 12 steps of 0.5 EV to start from under-exposed, and going past over-exposed. Then I've looked at the files with RawDigger.

HowTo? Add Ratings or EXIF info or Stars or Keywords to RAW file?

Submitted by l_d_allan on

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Is it possible to add Ratings to RAW files directly while using RawDigger? I'd like to add the equivalent of Stars rating, or some other for of EXIF or Keywords.

If this isn't currently possible, perhaps it could be a "Feature Request"? Thanks.

There is a work-around now ... view the same file in Bridge, and do the Star rating after leaving the file in RD. My experience is that when RD is viewing the file, it is locked to other applications (which is good).

DNG's containing floating point data

Submitted by anauta on

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Hi,

For a special application I am creating DNG's with IEEE 32 bit float data instead of (normal) integer data.

Rawdigger does not know how to handle these, unfortunately.

The content of my files are OK.
They are read by Photoshop as well as Lightroom.
Also using 'dng_validate.exe' shows no errors.

Thanks for the wonderful program and greetings,
Auke Nauta

P.S.
I can make a floating point DNG available if you like (dropbox)...

Nikon WB preconditioning

Submitted by anauta on

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Hi,

I would like to undo (as fas as possible) the WB preconditioning of my Nikon D600 raw files.
However, I do not know where to find the red and blue scale factors used for digital mutiplication (I am using Libraw to read the files).

Would you know where to find, or how to derive, these values?

And what about black compensation?
Are the NEF raw values black corrected? And if so, by which black value(s)?

I appreciate any help on the subjects!

Greetings,
Auke Nauta

Comparing Rawdigger to Nikon Capture NX2

Submitted by jthomas03 on

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I am studying an image I made with a Nikon D600, comparing histograms and under/overexposure between Rawdigger and Nikon Capture NX2.

Rawdigger shows no overexposure and 9.2% underexposure in the blue channel. NX2 shows no underexposure but significant overexposure in the red channel. Can you help me to understand this? I was using auto white balance in the camera.

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