uncalibrated colour space in XP. why?

[dave_bass5]

After converting my RAW files to jpg using either AdobeRGB or sRGB using either RSE or C1 WinXP reports that the colour space in uncalibrated but if i output jpgs from my 350d XP reports the correct colour space.
The clour space is corrct according to PSCS2.
I know winXP doesnt use colour profiles but it reports the out of camera jpg's ok.
any ideas why?

Dave.

[lancea]

Can you please clarify what you mean by "WinXP reports that the colour space is uncalibrated". I don't think the operating system itself ever does that.

[dave_bass5]

yes. if you right click on an image file and go to properties/summary/advanced XP shows you some of the exif data including colour representaion. this would normaly be sRGB for my jpg,s if thats how i shot them but it will show uncalibrated if they are shot in AdobeRGB or as i said output from RAW.

Dave.

[lancea]

Okay. That's only because the converter you're using isn't putting the colour space information into the EXIF. For example, I've converted my RAW files into sRGB JPEGs using BreezeBrowser Pro, and the Advanced Properties of the file show "Color representation" as "sRGB". If I had set BreezeBrowser Pro to create the JPEGs using "Adobe RGB" colour space. The XP properties would show that. Note that XP does indeed make use of profiles. However profiles are not the same thing as colour space.

The most important thing to note though is that your RAW files do not contain any colour space. If you set the camera to save images as either Adobe RGB or sRGB that information is written to the metadata of both RAW and JPEG files BUT IT ONLY AFFECTS THE JPEG FILES. Your RAW converter can make use of this information to set the default colour space, but that's all.

[dave_bass5]

Ian, yes i realise that.
What i was asking (and you have answered it) was why the info is not showing up.
It happens with a couple of programs but the colours are different in XP if i output at different colour spaces.
Thanks for clearing it up. ill give breezbrowser a try tonight.

Dave.

[lancea]

It's usually an option with raw converters whether the "ICC Profile" is attached to a saved JPEG. For example, with Photoshop CS2 the "Save for web" preview has a checkbox for it. Most of what I've read says you should leave it unchecked as (when you post on the web) the majority of your viewers won't make use of the profile.

[dave_bass5]

So am i correct in thinking that my 350d attaches a profile to jpg's for sRGB but not AdobeRGB?
Thanks

Dave.

[lancea]

Just going back for a minute - the EXIF information you referred to in your first posts is just a tag to say that the photo was shot in sRGB or Adobe RGB colour space. It doesn't mean the file has an included profile. I'm fairly sure that the answer is no for both. The camera just fills in the EXIF tag.

Both sRGB and Adobe RGB are standard colour spaces. An ideal camera should output colours that accurately meet those standards. But note that you can create (or buy) a profile for a particular camera just as you can create a profile for a monitor. The profile would tell your computer how the camera maps to the colour space. Canon however doesn't create individualised profiles for each camera which are then embedded in JPEGs.

[dave_bass5]

Ok. going back to my first post all i was asking is why after conversion the colour space was not reported in XP but jpg's out of the camera are.
Thats all. if its a case of the output programs not putting a note of it in the exif that XP can read as you have explained then thats the answer to my question.
i sort of understand about the different colour spaces but this was just a question about why XP only reports sRGB
Thanks for you time and help

Dave.

[lancea]

I was just trying to answer your last question about whether the camera attaches profiles. Glad I could be of some help anyway.

[dave_bass5]

sorry for the confusion. It was from you saying about the raw convertors attaching a profile (as can PSCS2) so i wrongly assumed you meant that this is what was needed for XP to report the colour space. therfore i wasnt sure if that was the case with camera jpg's as XP reports them if i use sRGB
thanks again

Dave.

[lancea]

Not a problem. I'm rather glad there was a bit of confusion as it got me thinking more about the way things work!
Cheers,
Lancea