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Trapping Density

PDFRender: Trap Density Reduction
At A Glance

If you use trap density reduction, it will no longer be applied to 100% color values.

Applies To:

Automate, Manage, Control, Render

How It Works

The trapping parameter set allows you to reduce the color value of the trap stroke applied by the PDFRenderer. Since Apogee Prepress 6, the PDFRender will no longer apply a density reduction when the color being spread is at 100% tint value. It will continue to reduce the trap color's density for all other color values in the page.

Trap Density Trap Density 2

In the example above, you can see the gold color spreading into the blue. On the left, the gold color is applied at 100%. On the right, the gold color is applied at less than 100%. The trap density reduction is set to 30%.

The gold spread on the left is still at 100%. However, the trap stroke on the right is a bit more open than the original tint block.

Trap Density 3

If you look carefully at the dots, you'll see the pattern is different, the gold dots in the non trap area are BIGGER and the gold created by the trap stroke is smaller, reflecting the trap color density reduction from the parameter set. The creation of the trap parameter set has not changed. Values for trap color density reduction range from 0-100.

Why is this Important?
it's only important if you use trap color density. Typically, you don't apply density reduction unless There's a really good reason, for example, trapping pale colors to one another to reduce that "brown" line that occurs.

The idea behind eliminating density reduction on solids is because when you knock back something that's supposed to be 100%, you've created a possibility for contamination where one color can bleed into another when it's actually supposed to be solid.

So when you really want density reduction, we've taken care to address solids for you automatically, they will trap as solids!