ImagePASS C1

PrincessVT124 · #1 03-20-2007, 01:59 PM

I have been searching for a site to give me details about many of the following imposition software topics.
Relative Colorimetic
RGB Sources
Gamma
Simulation Profiles and Methods
Output Profiles
Color Line Control

Where do I get this information?

Jeff · #2 03-21-2007, 02:54 AM

I'm a bit of a simpleton when it comes to color profiles, etc. because we print 98% in-house start to finish, so I can live in my own little color world where it only matters if my screen matches my output.

If you're in the fiery print driver under colorwise -> expert color, the RGB Source Profile is simply the colorspace of the RGB application you're working in. So if you're printing a microsoft office file or working in RGB in corel for example on a windows computer, you'd choose sRGB. (I sometimes do web layouts in corel which are done in sRGB so I leave this to sRGB so I can print without having to do a color conversion in corel first when I print these to tack on the wall; more often I use this to print a batch of images from my nikon camera which is set to sRGB, but can also be set to adobe rgb, which if I did so, I would change this parameter to correspond.)

CMYK Simulation Profile I leave set to SWOP coated with the idea that this is the output profile that will most likely be used if I send a job or a part of a job out to another printer or outsource rack cards and similar from components of the same job (or if I give the file to a client.)

Do you have the Color.pdf FieryColorRef.pdf that comes on the imagepass reference CD? It's not awfully intuitive, but it's the only help file I've found and once you wrap your head around it, it makes sense.

Quote:

CMYK Simulation Method
The CMYK Simulation Method allows you to define your preferred CMYK-to-CMYK conversion technique.

• Quick applies one-dimensional transfer curves to adjust output densities in the cyan, magenta, yellow, and black channels. This technique leads to eye-pleasing color output from your copier/printer because pure primary colors are not “contaminated” by other colorants. While it is the fastest simulation method and perfect for drafts, avoid using it for final documents that are used as press proofs. Other techniques offer the color simulation accuracy required by proofing applications.

• Full (Source GCR) provides a complete and accurate simulation based on colorimetric transformations. Hues are preserved, even for primary colors. The Gray Component Replacement (GCR) level that was specified in the original (source) document is also preserved for K-only text and graphics. Processed black expressed in CMY is reproduced using CMY toner. Full (Source GCR) is recommended for the highest quality press proofing applications.

• Full (Output GCR) is a complete and accurate simulation method based on colorimetric transformations. Hues are preserved, even for primary colors. With this method, the Gray Component Replacement (GCR) level that was specified in the original document is not
preserved. Instead, all CMYK data is reseparated using the GCR level specified by the output profile. This simulation technique is similar to traditional ICC color matching
methods and is more appropriate than Full (Source GCR) for full color printing designed for the press, but reproduced on your copier/printer.

Quote:

How color management works
Before you can print a color document, the color data in it must be converted to the gamut of the printer. Whether performed by the Color Server or a host-based CMS, the process of converting color data for a printer is the same: the CMS interprets RGB image data according to a specified source profile and adjusts both RGB and CMYK data according to a specified output profile, also called a destination profile by some color management systems.

The source profile defines the RGB color space of the image’s source: characteristics such as the white point, gamma, and the type of phosphors used. The output profile defines the gamut of an output device, such as a printer. The Color Server (or the host-based CMS) uses a device-independent color space to translate between the source color space and the color space of the output device. The Color Server allows you to specify default and override settings for the source color space information and the output profile information (see Color Printing). When you use these settings, there is no need to use the features of other color management systems. Your Color Server software includes ICC profiles for use with other color management systems, although conflicts may arise when the Color Server CMS is used in conjunction with a host CMS.

You can also use color management systems to adjust color data to the gamut of an output device other than the one to which you are printing. This process of simulating anotheroutput device is commonly used for proofing jobs that are printed on an offset press.

I'm not sure about color line control though. I don't believe I've used that option -- where is it in the driver???

PrincessVT124 · #3 03-21-2007, 12:58 PM

Jeff,
Thank you, I have a student who has produced a beautiful comic book. The problem led us to investigate all those "extra" buttons. What I found was this great site, so I signed up yesterday. I did not expect such a quick response. I never did think to check the CD, as it was installed by a professional that was part of the printer install process.
I read your response to the class - It was the first forum question ever.
This should be a great way for all of my students to ask questions that I do not have an immediate answer too.
Thanks Again
PrincessVT124


2-Color Offset	4+ Color Offset	Direct Imaging	Digital Press	Color Copiers	Finishing	Inkjet & Fine Art

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