LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

RAW data processing

Submitted by davideanastasia on

I wonder whether there is a way using LibRAW to process the RAW data (I think I read thru the manual how to do that) and to store that back in the RAW file (a NEF, for instance). To simplify, is it possible with LibRAW to *modify* a RAW file, instead than unpacking it for storage in a different format.

All the best for 2013, still 2 hours to go in Italy :)
David

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dcraw_make_mem_thumb

Submitted by amandra on

You note that this will return either JPEG or RGB. Why not leave this in PPM format like dcraw_thumb_writer?

Additionally there's a typo in the documentation as it states that the type will be LIBRAW_IMAGE_JPEG, regardless. I checked the code and it appears to correctly type LIBRAW_IMAGE_BITMAP for RGB output.

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dcraw_make_mem_thumb

Submitted by amandra on

It states that the output is either JPEG or RGB bitmap. What is it in the case of a PPM thumb model? The output does not appear to be either a JPEG, bitmap, or PPM.

I've checked the header and it's certainly not PPM.
I've tried loading the buffer into a bitmap in Java and it fails.

I can however dump the PPM thumbnail via dcraw_thumb_writer, so it can be processed.

Thanks!

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Skipped lines in Raw-Processing

Submitted by DragonTEC on

Hi everybody,

i've got a strange issue:

When i load a raw file (dng, converted via Lightroom from canon cr2), process it and try to save it into jpg, every like 175-200 lines are skipped, so the overall image has less height and the rest is filled with black.

A sample of what I'm talking about: http://art.untested.de/private/blub.jpg

what i'm basically doing is (error checking and other stuff ommitted for readability):

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Segmentation fault when called subtract_black() version LibRaw-0.15.0-Beta1

Submitted by juanmafont on

Probed with .CR2 file from canon 350d.

Segmentation fault launch at line 2204 of libraw_cxx.cpp

 
2202           for(i=0; i< size*4; i++)
2203              {
2204               int val = imgdata.image[0][i];
2205                val -= cblk[i & 3];
2205                imgdata.image[0][i] = CLIP(val);
2205                if(C.data_maximum < val) C.data_maximum = val;
2205              }

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Cannot figure out correct color conversion

Submitted by SAn on

I trying to get correct color after iProcessor.unpack(), but was puzzled by contents of libraw_colordata_t structure. Suppose that I have already done demosaicing but still have color in camera color space. What formulas do I need to use to convert (R,G,B) -> (X,Y,Z)? I tried these without success:

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