LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

New image pixel cropping feature

Submitted by pocruadhlaoich on

Hi,
the company that I work for has now paid for and received a patch from Dave Coffin for new image pixel cropping functionality. We are C++ programmers and are eager to get this new code integrated into LibRaw as soon as possible, so if we can be of any help please let us know. Also, we may be available to assist in the future development of LibRaw. Can someone please reply back as soon as possible please as to how we may move these plans forward?
Thanks,
Patrick

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Crash when freeing a libraw_processd_image_i

Submitted by Joe on

I am using libraw in a project (Windows, Visual Studio). My program crashes, when I free the memory allocated by dcraw_make_mem_image:

libraw_processed_image_t *image = rawProcessor.dcraw_make_mem_image(&error);
free(image);

This does not occur, when I make the free-function defined in the libraw class public and use it to free the memory. What is the cause and solution to this problem?

Thank you in advance.

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OpenMP problems compiling

Submitted by hajma on

Hi,
when building kdegraphics 4.4.3 on OpenSolaris with the Sun Studio 12U1 compiler, the code inherited from LibRaw fails to build saying:
...
"/.../srcdir/libs/libkdcraw/libraw/libraw/libraw_types.h", line 109: Error: "}" expected instead of "start of omp pragma".
"/.../srcdir/libs/libkdcraw/libraw/libraw/libraw_types.h", line 109: Error: A declaration does not specify a tag or an identifier.
"/.../srcdir/libs/libkdcraw/libraw/libraw/libraw_types.h", line 109: Error: Use ";" to terminate declarations.

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Installing to /usr not /usr/local

Submitted by mattjones on

On Linux, why does the makefile install everything to /usr/local? It would be better to install to /usr. Can you add a proper configure script, or just change all the /usr/local to /user?

The reason for this, is that various programs that use libraw (such as shotwell: http://yorba.org/shotwell/) would be much easier to install if all we had to do was make, sudo make install.

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Implementing custom demosaic algorithm - any examples?

Submitted by murp on

As the title says I am working on implementing a custom demosaic algorithm. I am having some trouble writing intermediate results to file. I have been trying to use dcraw_ppm_tiff_writer() but I seem to be missing G2 in the output. I have the same problem trying to write the raw (opened and unpacked file) to a TIFF. Does anyone have a suitable example?

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cin / stdin

Submitted by dh on

Hello,

I'm not much of a c++ programmer but want to play around with libraw. I was wondering if any here could give some advice on getting dcraw_emu to read from stdin / cin. In the workflow I'm testing I would like to pass the image data this way rather than reading from a file.

Thanks,
dh

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Limit on number of images in file?

Submitted by mkarliner on

First, thanks very much for LibRaw, it is really helping me.

I'm pulling images out of files with many (many!) images,
and I've reached a strange limit. After exactly 486 frames (images),
I get a corrupted data exception. I've tried starting at the 400th
frame and I still get stopped at frame 486. The source file is
a cine file with frames of 2048 * 1080 16bit * RBG images in it.
I don't think that this creates any problem with an lseek, but I could be
wrong.
I've tried to see where the corrupted data exception is thrown,
but the code is err, somewhat opaque :-).

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Out of order call to libraw function

Submitted by mkarliner on

While attempting to get more than one image from a file which contains several, using

OUT.shot_select, I'm getting the error

'Out of order call to libraw function'.

I assume that I have to release some resource or reset the image processor in
some way, but I can't see how to from the documentation. Perhaps you could
englighten me...

Thanks in advance

Mike

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