LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

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!

Forums: 

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):

Forums: 

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              }

Forums: 

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:

Forums: 

Crash with NEF file in scale_colors

Submitted by william on

Hi,
I'm trying out Libraw 14.6 and many images seem to work fine, but an old Nikon D70 NEF is causing crashes that seem to occur in scale_colors.

Can someone please test this file with the latest version and let me know if the crash is real or I am doing something wrong when using the library?
http://saar.se/temp/_DSC0178.NEF

Regards,
William

Forums: 

Problem with precompiled libraw 0.14.7

Submitted by PFindMichael on 

// typedefinition: somewhere in another h file:
 
typedef libraw_data_t *           (*libraw_init_dll_def)(int v);
typedef void                      (*libraw_set_progress_handler_dll_def)(libraw_data_t*,progress_callback cb,void *datap);
typedef int                       (*libraw_open_file_dll_def)(libraw_data_t*, const char *);
typedef int                       (*libraw_adjust_sizes_info_only_dll_def)(libraw_data_t*);
typedef void                      (*libraw_close_dll_def)(libraw_data_t*);
typedef int                       (*libraw_unpack_dll_def)(libraw_data_t*);

Forums: 

Pages

Subscribe to RSS - LibRaw technical support