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Camera Raw, Photoshop and Image Quality
If the image opened by Camera Raw is imported to Photoshop as a 16-bit, doesn't that mean that the image manipulation done in PS gives the same results (quality-wise) as the one done in Camera Raw?.

In other words, isn't it the same thing whether one makes a curves adjustment in Camera Raw and opens the file, or, alternatively the file is opened as a 16-bit in PS and the curves adjustment is done there?.

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Http://www.flickr.com/photos/96953368@N00/..

Comments (12)

Excellent point. Martin Evening (author of Adobe Photoshop for photographers) mentions this specifically on the DVD that comes with the book. I will have a look and report back...

Comment #1

On the first point about quality, you are right it will be the same whether you make the correction in Camera RAW or PS..

From what I've read in the Martin Evening book; the set of image correction tools in camera RAW are more varied and useful in terms of making changes to the basic image (no layers in Camera RAW).

He says "Camera RAW provides a powerful and compelling alternative to the usual Photoshop editing tools".

Best if you grab a copy and read the rest of what he says on page 225..

As I see it, Camera RAW does all those things to image files that we used to do in the darkroom with chemicals to film and transparencies...

Comment #2

They are pretty much the same. I prefer doing most of my manipulations in PS rather than ACR since I can switch preview on and off to examine each manipulation. ACR does not have the preview switch capability.Leonhttp://homepage.mac.com/leonwittwer/landscapes.htm..

Comment #3

The before and after views are very useful. Adobe Lightroom does this brilliantly, it uses the the same engine as ACR, and has a very neat before and after view toggle...

Comment #4

Actually, there is a difference..

Camera Raw performs it's actions in a Nondestructive mode. In other words, all edits made NEVER alter the actual raw file itself. The edit information is stored in a sidecar XMP file or in an internal library. You can always go back and completely redo the raw file from scratch..

Once you save the raw file as a Tiff for instance, any edits done in Photoshop will now cause permanent changes; even if saved and opened as a 16 bit file. Edits done on a 16 bit file will not harm the file as much as an 8 bit file, but you can still damage the photo if too many edits are performed. The only way to ensure that changes are not made permanent in PS is to use Adjustment Layers and save the files with these layers intact..

Ancient_Mariner wrote:.

If the image opened by Camera Raw is imported to Photoshop as a16-bit, doesn't that mean that the image manipulation done in PSgives the same results (quality-wise) as the one done in Camera Raw?.

In other words, isn't it the same thing whether one makes a curvesadjustment in Camera Raw and opens the file, or, alternatively thefile is opened as a 16-bit in PS and the curves adjustment is donethere?.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

Http://www.flickr.com/photos/96953368@N00/..

Comment #5

Is PS's DNG along the same lines as Nikon's NEF??..

Comment #6

Actually ACR in CS2 and CS3 does have preview capability! You can see the adjustments/changes you do to the RAW file from ACR..

If you read Ben Wilmore's Photoshop CS3, pg 247, para 3 & 4 he talks about 16-Bit and 8-bit files and brings out some interesting points. The "seeable" differences to the human eye, file size and what monitors and printers can or can't do with the "information" Just some food for thought!..

Comment #7

One thing that I think is different is that in the Camera RAW window, you can adjust the sliders to get the Shadow and Highlights to be correct..

This can be seen by moving the sliders until the arrows in the top left and right corners turn black. Then you know that you don't have blown highlights and blocked shadows. Once in Photoshop you can then make other changes to suit your neeeds...

Comment #8

Changes made in ACR are non-destructive and are stored in an .XMP side car file. For changes to be non-destructive with a 16 bit file it would have to be saved as a PSD file with numerous layers..

The storgae room required for a 16 bit layered file is SIGNIFICANTLY larger than that of the sidecar file...

Comment #9

Please excuse the novice, is ACR include in elements 6 or is it just CS and lightroom, plus does it read different manufacture raws (nikon D50, ricoh grdII, sigma DP1).thanksmarc..

Comment #10

ACR Its a plugin that you add to PSEACR4.4 is the newest version..

Http://www.adobe.com/support/downloads/detail.jsp?ftpID=3894.

EnglishAdobe Photoshop Camera Raw 4.4 Read MeInstallation.

This new version of the Camera Raw plug-in replaces the original Camera Raw plug-in that was installed with Photoshop CS3, Photoshop Elements 6.0 and Premiere Elements 4.0. The Camera Raw 4.4 plug-in is not compatible with versions of Photoshop earlier than Photoshop CS3 or versions of Photoshop Elements earlier than Photoshop Elements 5.0 for Windows and Photoshop Elements 4.01 for Mac..

The latest version of the Camera Raw plug-in available for Photoshop Elements 3.0 customers is Camera Raw 3.6. The latest version of the Camera Raw plug-in available for Photoshop Elements 4.0 (Windows) is Camera Raw 3.7.gooner74 wrote:.

Please excuse the novice, is ACR include in elements 6 or is it justCS and lightroom, plus does it read different manufacture raws (nikonD50, ricoh grdII, sigma DP1).thanksmarc..

Comment #11

One thing that is confusing to me is the file size increases the more changes as layers are done to an image after saving, however when image is reopened, the past layers are no longer showing as if the image has been flattened. Question is if image is only one layer, why is file size so large (sometimes over 100MB) compared to size if changes are done in ACR?Will..

Comment #12

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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