That directory is where your raw setting preferences are saved: sharpening, noise reduction etc. Start off with the default settings and see how you get on. I leave smart colour un-ticked. Make sure "Enable Custom Profiles" is ticked because one is available for your camera. NB. the T2i is also known as a EOS 550D. When you hover your mouse over a thumb, the exif hot bar at the bottom of the screen will show the profile associated with the image and you should see EOS 550D.icm. It's not embedded in the raw image; embedded profiles such as for jpeg's and tif will show * .... * indicating it's embedded.
Terry

i dont get that data on the screen bottom.

I looked directly into the profile directory and there are lotsa .icm files but non
t for either REBEL T2i or 550D.

I made a change to the settings and saved it as EOS REBEL T2i. This made
a qsn file. But when i reloaded it the settings did not change.

I dont quite get it.

Also whats the difference between .icm and .qsm files?

Two more points to note.
The exif hot bar needs be on in Edit preferences, 2nd from bottom in drop down list.
When you change raw preference, you are asked if you want to re-build thumbs - if there are many, don't bother, just right click on ones you are currently dealing with and select rebuild thumbs.
Terry

PS. Check this Challenge post with the video again:
http://ddisoftware.com/tech/qimage-ultimate-challenges/challenge-80-the-mystery-of-the-qsn-file/

Hi again,
In Raw preferences, in the Working Color Space section you need to have Enable Custom Profile ticked. The default is Adobe. See attached screenshot.
NB. The 550D and other Canon dslr's have multiple names, T2i is one but I think the exif is always (for US & Europe) the 550D version. Just be aware of that. See second screen shot.
I think I said before, raw files do not have a profile embedded so there'll be no asterisks around the profile name in the exif hot bar.
Terry

Im ready to scream. Is 256K the total for four?
The last try

Terry must be out so I'll try to help.
Aside from the camera distortion list, there are two lists pertaining to your new camera.
One list that terry showed was to let the user know that your T2i is covered for decoding and Qimage use.
The second list (from Website) shows the cameras for which camera profiles were generated .
Your T2i is not included on that list.
That means that so far no one has taken target shots to create the profile.
There is no stored camera profiles until someone takes the trouble to shoot the targets.

See Terry on specifics. He got a camera about 2 years ago (Canon 600D). I seem to recall Terry creating a profile, but luckily he had his IT-8 target from his Profiler, Profile Prism.

So summarizing, the qsn file where you adjust presets does not need a camera profile so that works fine. Just remember to rebuild the thumbs in question after making changes.
The Adobe colorspace is excellent and you aren't missing a great deal between it and the camera profile.

Fred

Good questions actually!

That only applies to camera jpeg images not raw images - they are not processed by the camera, hence "raw".
When there is no camera profile, Adobe RGB colour space is used.
When a raw image is loaded into QU it uses the qsn file parameters to process the raw file, noise reduction and sharpening are probably the most significant. Next set smart exposure, auto fill and black point so QU produces the best initial result. Raw refine can then be used to tweak.
You will not see any real changes from the thumbnail. You'd have to look at the image in detail (Image examiner right click on thumb) so see difference, ideally using 2 copies of same image, converted to a good quality jpeg or a tif.
I suggest you leave the noise reduction and sharpening at default but have smart exposure etc. (as above) set.
Have you watched the Learning Videos for raw images? The QU GUI has changes since these were made but the principles are the same.
https://www.youtube.com/embed/JBQPJw-ana8
https://www.youtube.com/embed/88jb-__8cmo
https://www.youtube.com/embed/qjkASfTzfFA
There may be some later videos than these - I'll ask Fred.
Terry