Rag Paper
Papers with a complete or partial content of cotton fibers.

Ragged Left
The term given to right-justified type that is uneven on the left.

Ragged Right
The term given to left-justified type that is uneven on the right.

Raster
To convert mathematical and digital information into a series of dots by an imagesetter as digital data that will be used for output.

Raster Image Processor (RIP)
Also called RIP, a device that translates data into pixels for print. Used to convert the output of a pre-press computer system into a format usable by an imagesetter.

Readers Spreads
Mechanicals made as they appear in printed piece, as compared to being imposed for printing.

Ream
500 sheets of paper.

Recto
The odd numbered pages (right hand side) of books.

Registration
The arrangement of one color of artwork with another. Multi color prints require the different colors of the artwork to line up correctly in relation to one another.

Register Marks
Any crossmarks or other symbols used on layout to assure proper registration.

Resolution
Sharpness of an image on film, paper, computer screen, disc, tape, or other medium.

Reverse
Type, graphic or illustration reproduced by printing ink around its outline, thus allowing the underlying color or paper to show through and form the image. The image 'reverses out' of the ink color. Also called knockout and liftout.

RGB
The color space of Red, Green and Blue. These are the primary colors of light, which computers use to display images on your screen. An RGB computer file must be translated into the CMYK (the primary colors of pigment) color space in order to be printed on a printing press.

Rich Black
A deep and dark color of black created by combining other process colors with black.

Right Angle Fold
A term that denotes folds that are 90 degrees to each other.

Rub Proof
That stage of printed ink where the maximum dryness is achieved, and the ink will not smudge.

Rule
Line used as a graphic element to separate or organize copy.

Run-Around
A term given to copy that accommodates the lines of a picture or other image or copy.

Running Head
A title at the top of a page that appears on all pages of a book or chapter of a book.