LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Using only green pixels to create final image (discard red and blue)

Hi,

I was hoping for some advice on how to have libraw completely discard the red and blue pixels and only use the green pixels to interpolate for the final image. This is for a scientific application. I have done a fair amount of research and I believe there is no way for me to do this without modifying the source code. That is fine with me.

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Gamma correction in Libraw

For the life of me, I cannot clarify my mind about how gamma correction/expansion is managed in libraw/dcraw and in general in a color management chain. Or maybe, I have an idea that has to be confirmed/rejected.

I assume human eyes introduce a gamma compression of about 0.45 and that this is canceled out by the viewer who observe an lcd screen with the same law.

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Compile once for i386 and x86_64

Hi, I am using libraw in one of my projects on Mac OS X.
I want to build my mac app in Xcode with architecture set to "Stand(32/64-bit Intel)", so that I need to compile libraw that can be linked in both 32 and 64 bits environment. But at this moment, I can compile either i386 version or x86_64 version, i can not make it compile once for both architectures.
Can anyone help me? Many thanks!

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Do libraw manipulate the colors when loading? possible histogram normalize?

I created a little program that loads our .NEF images into OpenCV Mat objects. I also tried to use the samples coming with the source for converting to tiff or ppm. All 3 gave the same results, that the image looks like its been normalized in some way.

The image can be seen at https://04o62a.dm1.livefilestore.com/y2p7TPrRkirmyRkqZWfcwKZCK0Htr9OwJMe...

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libraw .Net assembly

Might anyone have a .Net assembly (dll) of libraw that I can reference in Visual Studio projects? I attempted to compile the libraw source in VS 2005, but ran into many errors and I don't think I am experienced enough to pull it off.

I can in principle use libraw.dll in my VB.net applications, but I found that translating the header files is quite a lot of work.

Thanks. Nathan

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