How can I process a linearly converted raw file while preserving color?

Hi,
I want to convert my raw files in a linear format (to preserve all the dynamic range and detail and prevent unnecessary clipping). My question is "how can I modify the brightness or luminance while preserving the hue and saturation of every color?"
As for applying the gamma curve, I guess the best and only way in Photoshop is to create a Levels adjustment and place a 2.2 in the middle (gray) input box. However, I read in http://www.luminous-landscape.com/tutorials/hybrid-conversion.shtml that a 4.75 value should be used... Why? Is the number placed there not correspond to the gamma being applied?
Thanks in advance.
Juan Dent
P.S.: getting colorimetrically accurate color from the camera, through all the manipulations in Photoshop is for me crucial. Any pointers as to what to do and what to avoid?

First of all, you should have used the Adobe DNG Converter 8.6, not an old, obsolete version. Always use the very latest version. 8.3 was simply the first ACR version to support your camera model, that's all.
Note that the DNG Converter works only on folders, not on individual raw files. Put all your Sony raw files in a folder and run the Converter on that folder containing the raw files.
I have absolutely no clue as to what on Earth you mean by : "upon reading the memory chip from Photoshop CS5".
You also need to make sure that CS5 is fully updated. You cannot rely on the highly and notoriously unreliable Adobe auto updater to tell whether you have the latest update installed or not.
I still have no idea what platform you are on, Mac or Windows. Please read the following for next time:
BOILERPLATE TEXT:
If you give complete and detailed information about your setup and the issue at hand,
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,
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,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them, etc.,
someone may be able to help you (not necessarily this poster).
A screen shot could be very helpful too.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
Thanks!

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