Originally posted by Jim Royal Neither DNG or PEF has a colour gamut associated with them. JPEG files do. But the control for colour space on your camera has no effect on raw files.
There is no difference in image quality when shooting DNG or PEF. The choice is provided merely as a convenience, depending on the software you prefer to use.
The real difference between one raw image and another comes from the software used to convert the raw images to raster images. Difference versions of Adobe Camera Raw can have marked effects on the resulting raster images.
And WheresWaldo is quite correct: Any compression in raw files is lossless, and does not affect image quality at all.
Thanks, Jim. It is obvious that flyer just doesn't get it. Whether the raw data is saved as PEF or DNG makes absolutely zero difference. There is no gamut associated with RAW data. If he doesn't want to believe us then he should just download the DNG spec from Adobe and see for himself. So, what that really means is that if you take a PEF and while working with the file you apply CYMK you will have exactly the same output if you did that with DNG.
Flyer, you are correct I answered it, you simply didn't understand the question! Look at it this way, no printer in the world, that includes personal printers, Photolab printers or offset printers can print a raw file directly. This also applies to monitors, no monitor can display RAW data directly without being "processed." They simply do not know what to do with them. All RAW files have to be processed. During that "processing" you apply a working colorspace, anything from aRGB to Working CYMK. You either print or display directly from the application, in which case it converts to a format the printer understands on the fly (usually TIFF) or that the video driver understands or you save it as such for use in a page layout application. Once there it is no longer a RAW file.
Now the source data, picture it this way, I have a file that has any combination of 26 letters. In one case I store them all in shorthand, if there are 5
a's in a row I store it as
5a,
bbb becomes
3b, when I expand them nothing is lost, it is the exact data. Now I take the same data except I substitute
z for every
a,
y for every
b, etc. When I process the file I reverse the substitutions. That is a simplified way of explaining the difference between DNG and PEF. The data is still the same, there is no wider gamut nor is there a difference in the actual numbers. Like Jim and I both told you, the difference is what
YOU do with the data afterward, how
YOU process the data, what
YOU use to work on the file.
Of course different gamuts have the ability to display or print different amounts of color, within the limits of the sensor, but the RAW data doesn't know anything about what gamut
YOU will apply, nor does it care. The sensor will record what the sensor records, period!
So please reread what you wrote and realize that practically all of it was incorrect and therefore misleading.
If the OP wants to shoot all their RAW shots in PEF or chooses DNG, he/she can rest assured that all the data is there for them to use any way they see fit. No worrying if one will print or display different than any other, it does not work that way.
On a side note. I use Adobe LR and I would rather work with DNG than PEF, but I shoot only PEF. Reason is the
lossless compression. I can get twice as many, or more, images on a card during a shoot using PEF. During downloading from the card I convert them automagically to DNG. Hard drive space is cheap, but that doesn't really matter either as LR will convert and compress it's DNG files. The best of one world!