Re: [PanoToolsNG] I was reading about Adobe's DNG spec...
- DNG is based on the Tiff / EP spec.. It's actually a great spec and it is lossy compression but as I said it's based on the Tiff format so if you modify the file you've forever lost the files original status..Raw more specifically Nikons Raw Nef format captures the raw data from your sensor.. but the file includes an instruction set .. This instruction set thru software modifies the characteristics of the original files but you never loose the original capture.. Primarily for these reasons RAW I think is far superior.. Nikon also has RAW compression which is claimed to be loss less ..It is visually pure but not mathmatically pure... Once you have made adjustments to your RAW file and it's where you want it .. Typically it has to be output to another format to be usable.. DNG , Tiff , JPG etc are all useable.. formats. From that aspect DNG is just fine.. Maybe some day RAW will be directly useable by teh entire industry but today it's not..jimbo----- Original Message -----From: Ken WarnerSent: Sunday, October 07, 2012 7:33 PMSubject: [PanoToolsNG] I was reading about Adobe's DNG spec...
...that is said to include lossy compression capabilities.
I wouldn't want to use lossy compression to save a raw image. Is there a way to compress raw images? Seems like there should be some way. LZW can compress tiff -- why not raw?
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> From: Ken WarnerLossless JPEG compression is supported as well as the more common DCT-based
> ...that is said to include lossy compression capabilities.
> I wouldn't want to use lossy compression to save a raw image.
> Is there a way to compress raw images? Seems like there
> should be some way. LZW can compress tiff -- why not raw?
lossy JPEG compression.
I don't know why people are so obsessive about lossless compression, though.
It's possible to do lossy compression lightly enough that no one could ever
tell what was the the original and what was the copy that went through the
Ciao, Paul D. DeRocco