The site for prepress & print devotees

Prepressure covers design techniques, PDF, PostScript, fonts, JDF and numerous other prepress topics that have to do with printed communication and graphic arts. This site teams up with B4Print.com, the favorite stake-out of many prepress professionals who regularly visit its forums.

How JPEG compression works

Computerphile published two great videos about JPEG compression. The first one discusses compressing color data, the second one is for techies as it dives into DCT and how high frequency image data are compressed.jpeg compression color artefacts

Some packaging statistics

I don’t know that much about packaging printing so the graphs below which cover packaging in general, not printing specifically, were interesting and new to me. They were published in an Ernst & Young study. The most interesting one shows which materials are used. No surprises there, I guess.
Packaging printing on paper, board, plastic, glass, and cans
Of course food and beverages need to be packaged but I am surprised that packaging for appliances, toys, etc only constitutes 20% of the market. Five percent of all packaging is for cosmetics, seriously?
Packaging printing for food, beverages, healthcare and cosmetics
I am surprised at the small size of the market in Latin America. I was once told that this is because many people buy their food on the local markets where it doesn’t need to be packaged. There is also serious room for growth for Asia and Afrika. 75% of the world population consumes only 34% of all its packaging.

Packaging printing in Europe, USA and Asia

Poll about preflighting

It has been five years since I published a poll about preflighting. This time the question is which tool everyone uses to check incoming files. Please participate in the questionnaire to the right.

Pressporn

Top 10 lists can be found all over the web, usually covering things like the 10 most stunning natural blondes or the 10 worst dresses at the Oscars. Now there is also a Top 10 list of the largest sheetfed offset presses. You know you want to see them, just admit it!

7B size VVLF sheetfed offset press

Follow us on Twitter

The local village idiot, also known as Prepress Pete, has been on Twitter for quite some time now. Since he cannot be relied on for any serious messaging, there is now an official prepressure.com Twitter account. If you’re serious about prepress and would like to know when new content appears on this site, please follow us. If you are somewhat less serious, consider following Pete.

New terms in the dictionary

Scratch off printing – the process of applying a foil to specific areas of a document. The foil can be removed with the edge of a coin or a fingernail to reveal the information printed beneath it. The process is often used on giveaway and contest printed materials, such as lottery tickets.
Short grain web press – A web press that uses printing plates whose long dimension is along the cylinders.
Ghost bar
– A ghost bar of take-off bar is a rectangular solid line or pattern that is added to a press sheet and trimmed away after printing. It helps equalize ink-laydown on the sheet by extending and evening out the printed area, thus avoiding ink starvation in any one place.
American Quarto
– Outside of North America the ‘Letter‘ page size is known as ‘American Quarto’.

What’s new?

New or reworked pages on 2014 prepress news, Xiaomi Mi2s, RAID, drupa, A8, abstracts, 2012, thermography, printing in the 18th century, photochrome prints and various dictionary terms.

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25 May 2015

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