Re: Acrobat 8 Color questions
Re: Acrobat 8 Color questions
On Jun 26, 2007, at 12:08 PM, Peter MacLeod wrote:
RI is a graphics state attribute, meaning that there is an operator
in a content stream that can change the current RI. The initial
graphics
state is defined to be Relative Colorimetric by the PDF Spec. That
means
that once a PDF is created, the rendering intent is fully defined for
each
object.
Some applications allow you to specify the rendering intent on a
per-object
basis. Those are usually reflected in a PDF content stream as a
graphics
state save operator, followed by the rendering intent-changing
operator,
followed by the operator that draws the object, followed by a graphics
state
restore operator.
You lost me.
I think the documentation you cited confuses "device-independent"
with "calibrated." A device-independent space like CIEXYZ is
colorimetric by definition. When we say color in a
colorspace is "calibrated" that means we know how to interpret
device-dependent values (RGB, CMYK, Gray, etc.) colorimetrically,
i.e. convert them to CIEXYZ or CIELAB, because the color is tagged
with a profile that tells us how to make that conversion. An
ICCBased CMYK space is both device-dependent and calibrated.
The documentation you cited talks about CalRGB being a
"device-independent"
color space, and I don't think that's an accurate description.
Well, then is "Calibrated" tagged and "Device" untagged?
Rich Apollo
G7 Certified Expert
Adobe Certified Expert, Photoshop
314-344-1144
email@hidden
www.prioritylitho.com
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