Re: scanners ,gamuts, and urban myths
Re: scanners ,gamuts, and urban myths
- Subject: Re: scanners ,gamuts, and urban myths
- From: "Cris Daniels" <email@hidden>
- Date: Tue, 26 Nov 2002 13:00:28 -0400
>
"The problems start to enter the situation when we try to calibrate these
devices colorimetrically. In those cases, there can most definitely be
clipping and "gamut" limiting. If we calibrate these devices to an IT8
target, they are by definition, gamut limited."<
Personally I think that there are better ways to deal with camera profiling
than we currently have at our disposal. If a camera vendor like Nikon could
provide their own way to accurately calibrate their camera, and simply output
the file in any desired RGB workspace, this would help significantly. They
would need to include some sort of target ( perhaps a modified colorchecker
type target with custom TDF) and all you do is simply white balance the
camera(optional step I suppose), shoot a raw file of the target, shoot the
balance of images that you intend to photograph. When you get back to the
computer you simply download the proprietary "calibration file" that was
created from photographing the custom target, and it is applied to all of the
images as they are processed in raw mode. The user would also have the option
to convert from the raw data to a wide range of RGB workspaces. The main
advantage is that the camera vendor knows how specifically to best calibrate
their chipset in the camera, and know best how their cameras work. This also
allows a camera vendor to skirt ICC spec and create their own way to color
manage (or should I say color correct) raw files without some of the current
limitations. This will also prevent numerous conversions to the raw file,
and the resultant file will be in a positive, normal RGB workspace, not some
unknown off the wall space that we are left to determine. The camera vendors
could also create their own workspace that is optimized for the camera model,
and this could be loaded into most RIPs and Photoshop. If you want to convert
to AdobeRGB, knock yourself out, for straight output to a large gamut device
I'll leave the image in the RGB workspace best suited to the camera and let
the RIP do conversions using the same space. Correcting digital camera files
with ICC profiles as it stands now is kind of a crappy scenario, we are using
different profilers which have differing levels of quality and accuracy,
different targets (of varying quality ), batch TDF files, its amazing that it
works at all with all of these variables. This is all just generic profiling
and it is obvious that the vendors know how to best calibrate their equipment
and unfortunately they are leaving us in the weeds.
My 2 cents....
Cris Daniels
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