You can override the document wide screening parameters on a block by block basis.
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Select the block whose screening parameters you want to change.
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Choose Specifications from the Object menu. The specifications dialog box appears. The Pen Screen option lets you change the screens that create the percentages of color you specified for rules and borders. The Fill Screen option lets you change the screens that create the percentages of color with which you filled objects. The Text Screen option lets you change the screens that create the percentages of color which you applied to text If you selected a picture block or rule, the specification sheet contains only the Pen Screen button. If you selected a rectangle, a round-cornered rectangle, an oval, or a polygon, the specification sheet contains only the Pen Screen and the Fill Screen buttons.
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Click Pen Screen or Fill Screen or Text Screen. The Pen Screen or Fill Screen or Text Screen dialog box appears.
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Deselect Use Document Default, and select Line Screen if you want to change the way the dots are organized. A dot screen prints as evenly distributed dots. A line screen creates the effects of parallel lines that create the picture, as in an engraving or on a television screen.
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Type a different number of dots or lines per inch, and type a new angle. You can specify from 20 to 200 dots or lines and from 0 to 360 degrees. Use 0 (or 360) to print a line screen horizontally. If you used both a 100% solid pen pattern and fill pattern as part of an object, changing the halftone screens has no effect.
TIP! For printing on an imagesetter at 2540 dpi, you can use up to 150 lines per inch and print up to 256 shades of grey for very high resolution. Check with your commercial printer to find out the recommendations for the types of pictures and graphics you plan to print on an imagesetter. Remember that the more lines per inch and shades of grey that you use, the longer it takes to print.
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Click OK to return to the Specifications dialog box, and click OK again.
