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- LibRaw can decode most common DNG formats (Bayer/Linear, 16-bit integer and
- floating point) by itself (you need to use zlib for deflate decompression
- support and libjpeg for lossy compressed DNGs).
- Some rare flavours of DNG files (e.g. for 8-bit files) are not implemented in
- LibRaw. These files never come from camera or DNG files created by
- Adobe DNG Converter, but created by some processing software that uses DNG as
- intermediate format.
- To decode such files you need to compile LibRaw with Adobe DNG SDK. This SDK
- to be used internally, standard LibRaw API remains untouched (you may specify
- what kinds of DNG files you want to decode via Adobe code, see below).
- To build LibRaw with DNG SDK specify USE_DNGSDK in defines and adjust
- include/linker path settings to point to DNG SDK's include and library folders.
- DNG SDK Version compatibility:
- - Since LibRaw 0.20, DNG SDK 1.4 is required (DNG SDK 1.5 may work too, but
- have not tested w/ LibRaw).
- - There are several DNG SDK 1.4 versions circulated, the oldest known is
- dated May 2012, you'll need the last one (dated June 2015).
- - This version is available from Adobe site:
- http://download.adobe.com/pub/adobe/dng/dng_sdk_1_4.zip
- In your application
-
- * create dng_host object (or derived object, e.g. with multithreaded) entity in your program;
- * pass it to LibRaw via LibRaw::set_dng_host(dng_host *) call to enable DNG SDK use on runtime
- * adjust imgdata.rawparams.use_dngsdk parameter with one of this values
- (ORed bitwise):
- LIBRAW_DNG_NONE - do not use DNG SDK for DNG processing
- LIBRAW_DNG_FLOAT - process floating point DNGs via Adobe DNG SDK
- LIBRAW_DNG_LINEAR - process 'linear DNG' (i.e. demosaiced)
- LIBRAW_DNG_DEFLATE - process DNGs compressed with deflate (gzip)
- LIBRAW_DNG_XTRANS - process Fuji X-Trans DNGs (6x6 CFA)
- LIBRAW_DNG_OTHER - process other files (so usual 2x2 bayer)
- LIBRAW_DNG_8BIT - process 8bit DNGs (e.g. JPEG compressed ones)
- Default value for this field:
- LIBRAW_DNG_DEFAULT=LIBRAW_DNG_FLOAT|LIBRAW_DNG_LINEAR|LIBRAW_DNG_DEFLATE | LIBRAW_DNG_8BIT
- You also may use this macro to pass all supported DNGs to Adobe SDK:
- LIBRAW_DNG_ALL = LIBRAW_DNG_FLOAT|LIBRAW_DNG_LINEAR|LIBRAW_DNG_XTRANS|LIBRAW_DNG_OTHER | LIBRAW_DNG_8BIT
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