Originally posted by molarade So, I've begun using Adobe Camera Raw (in CS2) for my RAW processing and I have a question for those familiar with it. There's an area of the ACR window in the lower left pertaining to workflow. One of the items has me a bit (pun intended) stumped. Bit depth lists 2 options: 8-bit and 16-bit.
My question is, given that RAW images come out of my K10D with a bit depth of 12-bit, what should I be using? If I select 8-bit, will I be losing information in the image? I would tend toward choosing 16-bit, as it's higher than the bit depth of my image, but would that mean there's some extrapolation done to the image?
Or am I not understanding something about the bit depth of a RAW image and how it fits in the workflow? Any feedback from you kind folks would be greatly appreciated.
A few things. Adobe really only works in 15bit in 16 bit mode. That sounds weird but that's what I've been told.
In case your wondering Abobe is not my editor, preferring to use Corel Photopaint.
One of the reasons:
Adobe Math
Hope I didn't mis-understand my source...
another fun reference:
Clarkvision: Raw Converter Shadow Detail Photoshop does 15-bit processing and I believe that is causing some issues with the "16-bit" processed data. I've been experimenting doing more and more processing in ImagesPlus as it does scientifically correct math (64-bit processing, but I don't believe that 64 or even 32 bits are really warranted-it's more the math).
I think this experiment shows that the main reason people have been having trouble with Margulis' challenge is not that 16-bits is not better, but the unusual way photoshop processes data.
funny thing about Mr. Clark is he basically states 8 bit is fine, but later states he does all his editing in 16bit. Go figure...
However, few of my images require high precision over a large dynamic range. So the vast majority only need 8-bit processing, or photoshop 15-bit processing, or even 8-bit jpegs. For example, the Kissing Herons image, above, produces a similarly great print when processed as an 8-bit tif with all processing in Photoshop (from raw conversion to final output). Clarkvision: Digital Workflow In the photo editor
* 1) I only do 16-bit editing. If the starting file is 8-bit (e.g. jpeg), the first step is to convert to 16-bits/channel.
With that statement I see no reason to shoot jpg only to expand compressed and truncated data ...
Next your RAW files are 12 bit. As you work on them the math will expand them to 15bit.
So your files aren't extrapolated at all but will be expanded when editing.
8 bit will lose information but w/ little photoshopping not real crucial BUT it is like the raw vs jpg arguement. My humble opinion is always work in the highest bit depth till finished.
If you save as jpg it will be truncated to 8 bit and compressed.