LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Gamma correction in Libraw

Submitted by desertglow on

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.

Forums: 

Compile once for i386 and x86_64

Submitted by xiaocong on

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!

Forums: 

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

Submitted by pksorensen on

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...

Forums: 

libraw .Net assembly

Submitted by towne56 on

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

Forums: 

serial id

Submitted by pocruadhlaoich on

Hi,
is it possible to get the serial id of a Nikon camera? I used:

LibRaw libRaw;
libRaw.open_file( "c:\\temp\\d800.nef" );

to gain access to the exif information but did not notice a camera serial id. Irfanview also uses dcraw and it is able to detect the serial id.
Thanks for any help,
Patrick

Forums: 

What is the format of GPS Data?

Submitted by lordloh on

What is contained in the unsigned gpsdata[32];?

How do I interpret the numbers? Is there any documentation related to this?

Here is an example - 

GPS:32
GPS:1
GPS:112393
GPS:10000
GPS:0
GPS:1
GPS:104
GPS:1
GPS:253126
GPS:10000
GPS:0
GPS:1
GPS:18
GPS:1
GPS:35
GPS:1
GPS:4800
GPS:100
GPS:1204
GPS:1
GPS:538976288
GPS:538976288
GPS:32
GPS:875638834
GPS:976302138
GPS:13361
GPS:0
GPS:0
GPS:0
GPS:78
GPS:87
GPS:0

Forums: 

Pages

Subscribe to RSS - LibRaw technical support