ACR 4.4.1 opening 8-bit TIFFs as 16-bit TIFFs

I have a number of 8-bit sRGB TIFFs produced from scans of 35mm colour slides by the Epson Perfection 4990 Photo scanner. Am using Win XP Pro SP3.
If I open these images from Bridge 2.1.1.9 directly in Ps CS3 10.0.1 they are correctly shown in File Info and at the top of the Ps file view window as being 8-bit sRGB TIFFs.
However, if I open these from Bridge into ACR 4.4.1 (using either CTRL+R or File/Open in Camera Raw) they are shown (in the blue text at the bottom of the view window) as being 16-bit sRGB TIFFs.
Further, if, whilst in ACR, I choose Open Image to open any one of these images in Ps, Ps then says that the image is 16-bit - that is, it now agrees with ACR. If I then save the image as a TIFF (whether or not any adjustments were made in ACR), Ps saves it as 16-bit which nearly trebles the file size (18 to 47 MB).
Anyone have any idea as to why this might be happening?

Andrew,
You are severely confused.
>Seems like ACR should be able to tell the bit depth of a file
RAW files are neither 8-bit nor 16-bit by themselves. It is the conversion in ACR that produces a non-raw (cooked) file in whatever bit depth you define in ACR.
>and the image is then opened in Ps from ACR, and you then choose immediately to close the image without making any edits in Ps, Ps still asks you if you want to save the changes to the document be
The instant you click on Open in the ACR dialog box, a brand new image is
created in RAM with whatever parameters you define in ACR. You no longer are looking at your raw image {or TIFF] but at a converted image that exists only in RAM. If you do not save it, that image is lost forever --meaning that you need to go back and open the raw image {or TIFF] in ACR all over again.
You need to do your homework, Andrew. Read the white papers linked in the FAQs of this forum to understand what a raw image is (essentially a very, very dark linear grayscale image) and read Jeff Schewe's book on ACR to learn how to use it.

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I hope you had a great weekend!
I see you are looking to change the boot order on your computer. Here is a link to 'Configuring the Boot Order in the System Bios" click here. Please let me know if you require further assistance.
Sparkles1
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BOILERPLATE TEXT:
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such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
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machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
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etc.,
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http://forums.adobe.com/thread/419981?tstart=0
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Ann - thanks for the response.
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How do I convince Camera Raw to do its job?
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You set the bitdepth in your work options dialog box, which you access by clicking on the line that looks like a link right under the ACR preview:
Don't be afraid to read the Help files or other documentation that came with Photoshop (otherwise known as Read The Fine Manual).

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I have a folder of tiffs that were recovered from an sd card out of a Canon T3i. The only recovery software that worked saved them as Tiff files. I can view the thumbnail, I can even view the full res version in Windows Picture Viewer, but the files cannot be opened by Lightroom, Photoshop, Infranview or Gimp. The all spit out a message to the tune of "unsupported tiff format".
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JJMack wrote:
Noel
Conroy is correct for the OP in this case. But does not work on my machine.
You and your machine are not the centre of the universe. In fact, dare I suggest that they are completely irrelevant and of no interest to all except yourself.
Chris's infomation I feel is also correct and important.
Nobody has disputed the correctness or importance of Chris's information. However, Chris's informative post was not an answer to the OP's actual question. My post that was marked correct by the OP should not have been unmarked as correct in order for Chris's post to be marked correct.
If I was having the same problem as the OP and downloaded his tiff and saw I had the same problem with his as with mine.
For heaven's sake, man! Please consider someone other than yourself for a moment!
When I saw conroy's append I would have tried it and found it did not work on my machine.
Who cares?! You and your machine are irrelevant to all except yourself.
I would then see that it worked on the Op machine and I would also have seen Chris append.
I would now be asking the Op which version of Windows and Photoshop he is using and what image Codecs he had installed on his system and I would be searching the net for codec to decode type 6 Tiff file. So I feel both appends are important a relative.
Nothing you write can excuse my post being unmarked as correct by a member of staff after the OP marked it as correct because it did correctly answer his question.
I was trying to tell conroy Chris was not writing he was wrong or incorrect. Because of the emotion conroy's append seem to convey to me.
There was no need for you to try to tell me anything of the sort. Again, I am asking you to read the thread carefully for once. I had never claimed that Chris wrote that I was correct or incorrect. I complained that my post had been unmarked as correct in favour of his post being marked as correct when my post, not Chris's, was the actual correct answer to the specific question posed by the OP.
What's to like or not like?
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To like or not to like the fact that Photoshop fails to read certain files that other graphics apps do read.

ACR 4.1 defaults to 8 bit

Using Photoshop CS3 under Windows XP...
Just spotted that when I open a RAW (Canon) file with CS3 (and Camera RAW 4.1), it defaults to 8-bit workflow settings (and I have to change the bit depth via the drop down box). CS2 defaulted to 16-bit
At the bottom of the Camera Raw 4.1 screen it states (for a RAW file I just opened) : Adobe RGB (1998); 8 bit; 2592 by 3888 (10.1MP); 240 ppi
Is there anyway to get it to default to 16 bit? I know it's only one extra step, but wasn't an issue with CS2
Thanks

>At the bottom of the Camera Raw 4.1 screen it states (for a RAW file I just opened) : Adobe RGB (1998); 8 bit; 2592 by 3888 (10.1MP); 240 ppi
>Is there anyway to get it to default to 16 bit? I know it's only one extra step, but wasn't an issue with CS2
The workflow settings at the bottom of the ACR screen are stick. If you choose 16 bit, the next time you use ACR it will be set to 16 bit. The same applies to the working color space

ACR 4.4.1 opening 8-bit TIFFs as 16-bit TIFFs

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