The example image 20130220-5160 turns out to have a size of 99 MB, which is close to the 94 MB of the linear compressed file written by Adobe DNG Converter but still about three times the size of the original.

DNG output with DNGC set to custom (version 1.4) setting, linear, compressedĭNG output files can be smaller than the original file or considerably larger.ĭPL 4 (current release) accepted+processed all DNG files without hesitation.ĭPR 1 (current release) accepted+processed all except the linear DNG files (expected)ĭPR Output size per file is the same, no matter what type and size the file image had,.

DNG output with DNGC set to custom (version 1.4) setting, linear, uncompressed.

DNG output with DNGC set to custom (version 1.4) setting, compressed.

DNG output with DNGC set to custom (version 1.4) setting, uncompressed.

DNG output with DNGC set to default conversion settings.

Original file (white background vs blue background of DNG files).

If so, I wonder why I had to shoot in RAW?Įach of the four blocks of images go along with the following rule:

So what I would think that if the DNG file is not much bigger as the raw file, then either 8 bits has been used or a JPG compression has been used or both. Under the tag compression I read that if compression has been used, it will be a JPG compression. This doesn’t have any influence on the amount of pixels. Lineair DNG means no corrections to the demosaiced image has been done. The 16 bit DNG/TIFF takes 2 byte per channel. For simplicity the sensor has the same elements. RAW files do contain R,G,B values: 1 channel per pixel. They both contain RGB values: 3 channels per pixel.

Darktable export dimensions