Press Pitch
The act of matching the printing press' output (or fingerprint) to the lens' pitch by performing a pitchtest on the same press that will run the actual product. This test will help determine the visual pitch number (or LPI) that will be used when interlacing the file that will go to press. < back >

Proofing Pitch
The act of matching the proofing device's output to the lens' pitch by performing a pitchtest. This test will help to find the pitch number (or LPI) that will be used to interlace the proofing file. < back >

Visual Pitch
The working pitch of a lens at the planned viewing distance. < back >

Pitchtest / Pitchtest Form
A series of graduated bars with an ascending LPI value that is used to determine the visual pitch of a lenticular lens sheet. This is generally used during proofing, platting, and on press. It is not uncommon for a lens to have a different visual pitch between the proofing device and the printing press. < back >

PPI
Pixels-per-Inch. < back >

Printers Proof
The proof that is generated by the printing company. These proofs are color calibrated to the printers system and presses. < back >

Radius
The degree of curvature of the lens. < back >

Refractive Index
The extent to which a lens focuses incoming light. < back >

Registration:
Alignment and/or placement. < back >

Phasing Registration
The placement of the interlaced image to the lens. Phasing registration affects the angle by which the first frame of the interlaced image may be viewed. Due to many variables in the printing process, phasing registration may vary from piece to piece.
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Poor Registration
See Color Leakage. < back >

Press Registration
The alignment of colors to perfect fit. < back >

Proofing Registration
The alignment of the interlaced proof to the lens. < back >

Resolution
The sharpness of an image on film, paper, computer screen, disc, tape, or other medium. In regards to DPI and Printing: The higher the resolution of your printer or image setter, the greater detail you can print and the better appearance of your output. < back >

Screen Angle
The angle(s) at which the halftone screens are placed with relation to one another in order to avoid an undesirable moire pattern. < back >