DNG vs. RAW owner files sizes

I was told that the dng files are compressed lossless files and would be physically smaller than files gross owners and started to use them in my workflow.  And this seems to be true with most Canon CR2 raw files.  However, I discovered a camera when this is not true and I am looking for a confirmation and an answer as to why.  I have both a Canon 5 d Mark III and a Canon 5 d camera.  On the Canon 5 d Mark III dng files are all smaller than the corresponding raw CR2 file.  About 17% smaller.  However on the 5 d dng files are as much as 50% more according to the raw settings.  The 5 d is a 50mp camera.  Fixed at the maximum 50 mp the dng file is smaller.  On the smallest setting, 12 mp, the file sizes are much the same.  On the medium setting 28mp file sizes can be 50% larger.  Someone knows why?  28 mp is the setting I use most of the time.

Sparky

This happens because the raw files not full resolution are not of the actual raw files. They are already demosaiced. The unit also uses a different compression algorithm for those who is not completely without loss if I remember correctly, like the color rendition is cooked in raw/sraw. It is a very bad idea. So the advantage of size compression lossless dng only works for normal files, full resolution, raw. In general, if you shoot in raw, you really do not want to use lower resolution settings, some of these cameras offer as you get all the benefits of the raw files of this way.

Tags: Photoshop Lightroom

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