Re: untagged RGB data
Re: untagged RGB data
- Subject: Re: untagged RGB data
- From: Chris Murphy <email@hidden>
- Date: Fri, 19 Dec 2003 16:37:18 -0700
On Dec 19, 2003, at 4:10 PM, John Zimmerer wrote:
The Generic CMYK Profile is based on SWOP TR001, probably the CMYK
equivalent to sRGB, so it's not such a bad default.
It's not at all a bad default. But there are other spaces, and assuming
source profile for CMYK is something we will be living with for a
while. And many regularly used CMYK spaces exist that are nothing like
TR 001. Assumed profile workflows for CMYK is something we will have to
live with for years to come, and because of this a user selectable
option for what to assume as the source profile I think is a good idea,
even though TR001 as a default is also a good idea. And vastly superior
to the situation we had on OS 9.
I'm not sure I buy the need for "OS working spaces", since I truly
believe all data should be tagged. And ultimately, this is the domain
of the user space applications (including AppleScript and sips), since
they manipulate color directly. The OS should simply render source
color accurately, and have a single definition (across workflows and
continents) of how untagged source data is treated, per color space.
There are numerous problems with tagging CMYK images because it's too
easy for tagged images to get repurposed by today's applications when
going to a destination with imperfect registration. Black only text and
drop shadows turn into four color. Two color 9pt text becomes 3 or 4
color. It's a disaster on these kinds of devices.
CMYK profiles are much larger than RGB tags. For people to have to tag
hundreds or thousands of images is an unnecessary workflow in the vast
majority of cases. It unnecessarily makes for larger files and rapidly
gets to the point where you are pushing gigabytes of redundant and
impertinent data over networks, and onto storage. Apple is in a unique
position, technologically, to address this problem with metadata and
networking - but that's a whole separate discussion.
The bottom line is that saying all CMYK data should be tagged is not at
all realistic.
I agree that all RGB data needs to be tagged. And even grayscale data
should be tagged. But CMYK is different, and it needs to be treated
differently too.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6)
_______________________________________________
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.