Gold resolution
Gold resolution
- Subject: Gold resolution
- From: "Adriano Von Markendorf" <email@hidden>
- Date: Fri, 8 Mar 2002 08:50:32 -0300
Hi folks,
Greetings from Greatest-beach's-beautiful-people-Land...!
I'm wondering about a well-knowed subject, I just receive the Bruce Fraser
book and I read about good rules of image quality and resolution.
Well, in my country the gold rule always was:
best dpi = target lpi x 2 in a plane offset.
eg. if you want 150 lpi target print the best resolution are 150 x 2 = 300
dpi.
So, about a year ago I read a extense article in the "Publish" brasilian
version ( I'm still trying to recover the author or sources!) talking about a
wasting of time, storage and quality using above rule. In this text the author
claim that the true scientific rule would be a: lpi x 1,46 / eg. 150 x 1,46 =
222 dpi and if you use more than that will got a "interpolation" effect that
create a new color pixel taking the average of excess of pixels. For sure the
article author give the links and explain in a good way. But, I have a strange
situation, because in fact, I can't get best results with 300 dpis image than
222 dpis in my offset 4 colors printers and I look very close the 133 lpi
samples images from the Bruce book and I CAN see best details using the X 2
rule.
Almost forgot ! Our offset system use positive films,the TIL for plane offset
are 320% using coated couche paper.
The average dot gain are 50 /64 CMY - 50/69 K.
Somebody hear about this article?
Bruce, I missing something?
How can I made a real "scientific" test to julge the best rule?
Thank's for any advance,
Adriano von Markendorf email@hidden
"I-C-Cm vitamin's inside" Rio de Janeiro - Brazil
ps:Bruce, congratulations for your book, I really liked your aproach.
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