Re: untagged RGB data
Re: untagged RGB data
- Subject: Re: untagged RGB data
- From: Andrew Rodney <email@hidden>
- Date: Fri, 19 Dec 2003 13:31:17 -0700
on 12/19/03 1:07 PM, Chris Murphy wrote:
>
1. Why are they untagged?
The camera manufacturers just don9t do it. They supply some EXIF data (if
sRGB). I can't tell you why they don't but it's a drag and the colorspace is
known (you the user have to set it) but not carried with the file (excluding
EXIF data which can be set to "none" which isn't helpful).
>
2. What application is being used to initially read these files? And
>
why can't that application have an interface to allow for assigning an
>
appropriate profile to it?
In most cases, the first application will be Photoshop. It depends. The data
is coming from RAW files straight into TIFF or JPEG using some method to
produce "roughly" "Adobe RGB" or one or more flavors of what they like to
call "sRGB". At this point, the files are on a card and the user will
perhaps start directly in Photoshop or produce a catalog (iView Media Pro or
iPhoto).
>
3. Again why is the ONLY correct way to do this through assumption?
In such a case, there really is no assumption IF the user understands how
they set the camera (what colorspace) and more importantly how to setup
Photoshop to deal with the untagged files.
>
How many people use
>
DSLR's are sticking their untagged, uncorrected, un-Photoshop'd images
>
directly into any of these applications?
Not many I'd hope. But there are a number of applications for cataloging
files that may act this way.
>
What application is the first point of contact for these files?
Photoshop, maybe Elements or the host software from the camera.
>
It is a perversion that I'm not inclined to encourage by having three
>
different sRGB settings in the ColorSync preferences window! They can
>
either embed them in their images, or too frigging bad.
I don't want three sRGB settings (I don't even think we should have three
sRGB's). What I'm suggesting is that there are situations where you might
want to tell whatever system is making an assumption about the untagged
files that these are in X or Y colorspace, not necessarily assume it's sRGB.
I think your suggestion of doing this WILL help in many cases but there are
cases where hard wiring sRGB with no way to alter that could cause further
problems for some.
>
That should be up to the camera to do, or the image capture software.
I don't disagree but that's not what is happening so we have an issue where
a lot of untagged data is being created that's not in sRGB.
>
Assumption should be discouraged when it comes to initial point of
>
contact with images from a digital camera.
We are not assuming as in most cases, the user tells the camera "I want
sRGB". That you end up with a slew of untagged files is the problem and the
EXIF data has been as much harm as good. So while we are not always
assuming, we do have untagged files being created and I'm not sure we'll
ever see the camera manufacturers change (at least anytime soon).
>
You are talking about a capture issue, and wanting to solve that
>
problem with a really blunt object through brute force - the OS.
Yes to a degree. That would be somewhat of a feather in Apple's cap. There
certainly are other utilities that could take this slew of untagged files
and tag em (even AppleScript). I'm just saying that this could also work if
we could open that back door and tell the OS, "This isn't sRGB, it's Adobe
RGB".
>
That's why I keep saying we need more options in the applications to
>
TAG our images. Not use RGB Default pop-up menu as a hammer. That's a
>
very crude hack and it does nothing to solve the underlying problem of
>
untagged images. It just brings users the power to have random
>
assumptions. Seems like a bad idea to me.
You're getting close to convincing me. For the user who knows the meaning of
the file AND has Photoshop, the solution is easy to fix. With iPhoto?
Andrew Rodney
http://www.imagingrevue.com/
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.