Whew...nothing like getting nitty-and-gritty on a Friday evening. I had someone mention stochastic and staccato printing today. So I thought I'd share the story.
The Definition
There are two primary rules to stochastic printing:
1.) The pattern of dots is randomized, and
2.) The dot is significantly smaller than the standard line-printed dot. Density is determined by a frequency of dots in stochastic printing.
Basically in regular (or AM) line screen printing, the size of the dot shrinks or grows to basically portray a change in percentage or lightness/darkness of an image. In stochastic (or FM) line screen, the size of the dot doesn’t change, but rather the frequency changes.
If you’ve heard the term staccato thrown around, this is basically an upgraded version of stochastic. The primary difference is that the size of the dot in the mid-tone range (40 – 60%) increases ever so slightly (FM 25 as opposed to FM 20…the 20 and 25 being a micron measurement). After much testing, it was discovered that the smaller dot made the image a little grainier than the rest of the tone percentages. This was a simple change that seemed to smooth the entire image out.
The Benefits
AM screening, or stochastic/staccato printing, is a great way to re-produce high-end, detailed photography. Additionally, it is a great way to give high-end jewelry (especially glass and clear gems) more life and curvature. Stochastic/staccato is also seen in: nature and human photography (staccato especially performs well with flesh tones), and detailed still life photography.
The Negatives
Many printers establish an upfront service fee for stochastic/staccato printing. On the other hand, many estimators estimate the increase of make ready time/material it will take after each plate change. Regardless however, there is some cost to this service. So as I recommend to all my customers, stochastic/staccato printing should be something that is planned appropriately prior to go to press.
That's it! Okay...more fun stuff after this post...I promise
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4 comments:
I know, it's bizarre to post a comment to my own blog, but I must admit it, I was busted with a HUGE typo. Under the "Benefits..." section of the blog I begin the section by mentioning how great AM line screen is...this was supposed to be "FM". That's what happens when you attempt to explain staccato printing on a Friday.
Erratum noted.
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