Regarding screen colour using 'screen-color'

As per my client's requirement I have developed Tabstrip in the module pool progarmming. The requirement is to change the screen colour.
My question is can we change the screen colour ?
What is the use of 'SCREEN-COLOR' Parameter ?
If using 'SCREEN-COLOR' how one can change the colour of the screen ?
Code I have employed is as follows
In the PBO of screen to be called
LOOP AT SCREEN.
SCREEN-COLOR = 2.
MODIFY SCREEN.
ENDLOOP .

Hi Mahesh,
Please let me know where have you found this parameter.
Thanks,
Sai
ok got it
Edited by: Sai Krishna Kowluri on Jun 15, 2009 1:06 PM

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I'm struggling to create gradients for screen printing purposes. The artwork will be printed on 12oz canvas using 3-4 pantone spot colors.
1) if I fill an object with a single Pantone color, create a mesh gradient from it using a variety of different opacity settings, say 100%, 50% and 25%, then play around with the mesh handles to produce a pleasant, mixed background, will a gradient of this type work for screen printing? I don't know if a gradient of this type will require halftones, as a linear or radial gradient would.
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Getting your head around a few age-old fundamental repro principles will clarify this stuff for you:
First and foremost: Think in terms of INKS, not "colors." Take off your designer hat and think like a mechanic. You're dealing with real-world substances: scoops of thick, gooey, solid-color ink that will be squished onto some object.
Line Art: Artwork designed to be reproducable using only areas of solid ink coverage. No graduations of any kind whatsoever. In other words, nothing but 100% "tint" (often called "solid") of the ink(s).
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Halftone: A photomechanical process used to distribute small dots (or lines, or some other pattern) of ink so as to SIMULATE tints and/or gradations. That's the important concept: There are no "graduated inks." Any given location on the final print either has ink or it has no ink on it. The ink is always a solid color. So anything other than the actual color of the solid (100%) ink is a mere SIMULATION. That simulation requires that the ink be laid down as a series of tiny dots (or array of lines, etc.) so as to suggest things other than the 100% color of the actual, physical ink that is loaded into the press (or silkscreen).
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I'm struggling to create gradients for screen printing purposes.
Grads are going to require halftoning. Have you asked your screen printer what halftone frequency (LPI) he is able to reliably hold?
The artwork will be printed on 12oz canvas using 3-4 pantone spot colors.
Understand: Pantone is a company. The Pantone company publishes its own standardized formulae for its own branded inks, which are offset lithography inks, not silkscreen inks. In other words, it's just a commonly-used color reference. You would be better off refering to actual color swatches of the actual screen printing inks your screen printer will be using. Set up your Spot Color Swatches in Illustrator corresponding to the actual inks.
1) if I fill an object with a single Pantone color, create a mesh gradient from it...
Always state WHAT VERSION of Illustrator you are using. Grad mesh did not always support spot colors. Blends still don't.
...using a variety of different opacity settings, say 100%, 50% and 25%...
Don't confuse "opacity" with "tints." What Illustrator calls "opacity" and "transparency" usually involves rasterization and/or conversion to process color.
... then play around with the mesh handles to produce a pleasant, mixed background, will a gradient of this type work for screen printing?
It will work for screen printing IF:
The particular screen printing setup adequately supports halftoning.
The mesh is built appropriately for the color separation model (spot, process, or process-plus-spot) that will be used to print it. Again, you have to be aware of the number of INKS that you are designing for, and make sure your design does not require more than that when it is color-separated (think "ink-separated").
Current version Illustrator provides a color-separation preview feature, which can save you alot of grief if you use it. If using an earlier version, but have Acrobat Pro, save the file as a PDF, open it in Acrobat, and use its Separation Preview feature. If using an earlier version and do not have Acrobat Pro, "print" as color-separations to a PDF virtual printer like Adobe PDF. Then open the PDF in Reader and study the separate pages. (Screen print jobs are, in fact, often delivered as such a pre-separated PDF.)
I don't know if a gradient of this type will require halftones, as a linear or radial gradient would.
Based on the above, you should now know that. Yes, ANYTHING that involves graduated color requires (at least a simulation of) "graduated ink". Since "graduated ink" does not exist, halftoning (or some other kind of tone screening--there are others) is required in order to simulate it.
2) it's my understanding that when you prepare artwork for screen printing using spot colors, each color should be on its own layer.
No. Absolute nonsense. (Don't believe everything you find written by self-proclaimed "experts" or "tutors" on the web, no matter how fancy you think their demonstrations are.) If that were true, then how, (for just one example) could you possibly screen print a rectangle with a spot-to-spot grad fill? The path containing that grad resides on one Layer, doesn't it?
In an attempt to add highlights or shadows to an object, if I copy an object and paste it in front of itself, then apply a gradient using another Pantone spot color, say Pantone Process Black(100% to 0% opacity), does it matter what the blending mode is?
Yes, it matters. Blending Modes has to do with so-called "transparency" effects. Again, anytime you muck around with "transparency" you increase the liklihood of rasterization and/or conversion to process at output. You would be safer setting that copied, pasted, grad-filled object to overprint. Halftoning will still be required, at least on the separation corresponding to the ink(s) for that grad.
Obviously you'll get different results based on the option you choose... I'm concerned here only with screen printing.
If you are designing for SPOT COLOR screen printing (as opposed to process color), stay away from transparency effects unless/until you understand what you're doing.
I can then place the gradient on the Black layer.
Again, forget Layers corresponding to ink separations. A total misconception. Utterly unnecessary.
The problem is that I'm familiar with off-set printing, and apparently gradients have to be converted into halftones when screen printing, so I'm trying to figure out the best way of creating shadows and highlights.
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Moderator message: not a proper question, please do more research before asking, study the entire dump text for hints, search for SAP notes.
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