Pre Press

Halftone Dots

Pre Press

Rather than printing a solid image, all offset printed images (and many other kinds of printing) is composed of tiny dots called “halftone dots.”

To show shading or gradation, the dots can be printed larger or smaller. Larger dots make for darker, denser colors, while smaller dots make for lighter, less dense colors.

Halftone dots are expressed as a percentage. For example in a given area on a page or Clear File printed at 50%, ink would cover 50% of the area, while 50% of the area would have no ink coverage.

Printing on the Front and Printing on the Back

Pre Press

Typically, when printing on paper for example, designs are printed on the front. However since Clear Files are printed on clear material, we actually print the designs onto the back of the material, allowing the design to “show through” to the other side. (Think of it like looking at the design from the other side of a window.)

Printing on the reverse side allows us to prevent the ink from getting scratched or damaged, thus making the file more durable. It also allows us to preserve the natural sheen and transparency of the plastic.

White Ink on Clear Files

Pre Press

Clear Files are printed on clear plastic, and the ink used is also clear. This means that when printing a design, it will generally be transparent, and sometimes difficult to see. To make the final image opaque (and easier to see), we use white ink.

clear file-Zodiac-4C-W

 

We can also print designs using white ink. Covering an entire file or half a file with white ink, using white as a spot color and printing letters and text with white ink are all possible.

 

clear file-Mahfood-4C-W

 

 

Full-Color Printing (4 Color Process)

Pre Press

Full color printing is only made up of four colors, Cyan, Magenta, Yellow, Black. In printing jargon, this is called CMYK.
CMY (Cyan, Magenta and Yellow) are printed in tiny dots, and depending on the density and composition of these dots.
Layering CMY does make black, but for printing purposes it is not a very “pure” black. In order to create a more beautiful image, we also use black ink.

clea file-CMYK
For our clear files and other products, we print each color separately on our offset presses. The finished product is composed of all four colors layered over each other.