LibRaw technical support

Stable LibRaw versions: technical support, errors, API questions

Orientation of some Canon files wrong in LibRaw 0.19-Snapshot-20170212

Submitted by asdiele on

Hello!

Using dcraw_emu.exe compiled from the LibRaw 0.19-Snapshot-20170212.

Some Canon files are being displayed with the wrong orientation, they show as landscape when they should be portrait.

Looking at the code I found a place in dcraw_common.cpp with a note saying :

#if 0 /* Canon rotation data is handled by EXIF.Orientation */

If I re-enable that piece of code then the images show correctly. I tried to look around for "EXIF.Orientation" or something like it but couldn't find it.

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Nikon Coolpix P330 - wrong black and white levels

Submitted by netgeek on

Hi guys,

There seems to be a bug in LibRaw 0.19-Snapshot-20170212. To reproduce:

1. Download a Nikon Coolpix P330 raw sample. Here is one website to download from:

http://www.photographyblog.com/reviews/nikon_coolpix_p330_review/sample_...

2. Use dcraw_emu to convert the raw file to TIFF (or some other format). The TIFF image will appear almost completely white.

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dcraw_emu - Brightness Level

Submitted by chris_s on

First, thanks for creating this version of DCRaw. I have been using the original DCRAW as part of a utility I have developed to make it easy to run the NIK Collection standalone. One of the added features is the ability to input RAW files. I needed a way to support Fuji X compressed files and this is probably the best and easiest way to do that. It also seems to be quicker than the original DCRaw.

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0 width and height after processing

Submitted by adsamcik on

Before I run
LibRaw::raw2image() or LibRaw::dcraw_process()

LibRaw::imgdata.sizes contain proper dimensions but after running one or the other the values are 0. Both functions return LIBRAW_SUCCESS (0)

I have no idea how to debug this. All images tested are cr2 and open just fine in other programs including "dcraw_emu.exe".

everything I did is below.

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Fuji X-E2s White Level

Submitted by netgeek on

Hello,

I'm noticing that LibRaw reports a different white level from Adobe's DNG for this camera (and possibly other Fuji cameras too).

Here is one publicly available test image.

http://img.photographyblog.com/reviews/fujifilm_x_e2s/sample_images/fuji...

I converted this image to a DNG using Adobe's DNG converter. The white level stored in the DNG is 16383.

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CR2 to Tiff conversion produces darker image

Submitted by shawnathan007 on

I have a .CR2 image taken by a Canon 80D camera. I'm using LibRaw to convert it to a .TIF. The .TIF which is created is darker than the original .CR2 file (when viewed using Canon's Digital Photo Professional or Irfan View)

I read the contents of the .CR2 file to a buffer, then pass the buffer to this method to convert and save to .TIF:

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Problem with Samsung NX300 files with LibRaw+RawSpeed

Submitted by asdiele on

Hello,

If you compile LibRaw with RawSpeed and extract a tiff for a NX300 file you will see that the developed image is different as compared to the developed image with LibRaw without RawSpeed. By different I mean very different, blues become orange, yellows become blue etc. You can see this problem in the NX300 sample in the rawsamples website

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Problem with LibRaw using RawSpeed and Samsung NX300 files

Submitted by asdiele on

Hello,

If you compile LibRaw with RawSpeed and extract a tiff for a NX300 file you will see that the developed image is different as compared to the developed image with LibRaw without RawSpeed. By different I mean very different, blues become orange, yellows become blue etc. You can see this problem in the NX300 sample in www.rawsamples.ch.

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