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## hrant's ink trap page

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• hrant, thanks for posting your website to the list. i didn t understand the discussion til i saw your page. what is the purpose of the control points? in
Message 1 of 2 , Jun 5, 2002
hrant, thanks for posting your website to the list. i didn't understand the
discussion til i saw your page. what is the purpose of the control points? in illustration
#3, the lines from the aperture to the new corner are straight, while in #4 they are slightly
convex. is that curving related to the control points? thanks, brian

hrant wrote:

There are different constructions for traps, but the
principal one I've tried to "quantify" into a method
which can be applied with consistency and speed.

Here is the "first installment" explaining my method:
http://www.themicrofoundry.com/ss_trapping1.html
• ... So you mean the ones at the very end that turn the straight segements into curvy ones, right? Well, you could see them as only having an aesthetic role. A
Message 2 of 2 , Jun 5, 2002
--- In PPLetterpress@y..., Brian Molanphy <bmolanphy@c...> wrote:
> what is the purpose of the control points?

So you mean the ones at the very end that turn
the straight segements into curvy ones, right?

Well, you could see them as only having an aesthetic role.
A [digital] text face can in fact be used for display work,
and it's good to account for that by reducing the jarring
effect of a trap.

I guess you could leave the segments flat (which would
in fact increase the trap's "ink capacity"), and usually
it won't matter (it might even look more appropriate in
some designs, such as Petr van Blokland's Proforma), but
continuity of curves is generally a good thing, at least
in mainstream bezier philosophy.

Also note that from a purist perspective the trap has to
curve in as an arc because ink gain is radial, and the
opposite of that is what might be called a "cleavage",
for lack of a more docile term.

hhp
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