Tack In printing inks, the property of cohesion between particles; the separation force of ink needed for proper transfer and trapping on multicolor printing presses. A tacky ink has high separation forces and can cause surface picking or splitting of weak papers.

Tagged image file format (TIFF) A file format for graphics suited for representing scanned images and other large bitmaps. TIFF is a neutral format designed for compatibility with all applications. TIFF was created specifically for storing grayscale images, and it is the standard format for scanned images such as photographs - now called TIFF/IT.

Terabyte (TB) One trillion bytes.

Text The body matter of a page or book, as distinguished from the headings.

The Internet A network of networks that links workstations over telecommunication lines to share files and exchange e-mail internationally.

Thermal dye sublimation Like thermal printers, except pigments are vaporized and float to desired proofing stock. Similar to Thermal Dye Diffusion Transfer, or D2T2.

Thermal transfer printer These printers use a transfer sheet that carries ink and is placed in contact with the paper or plastic transparency, and a heated printhead driven by digital data touches the transfer sheet to transfer images to the right positions on the page.

Thermo-mechanical pulp In papermaking, made by steaming wood chips prior to and during refining, producing a higher yield and stronger pulp than regular groundwood.

TIFF See tagged image file format.

Tints Various even tone areas (strengths) of a solid color.

Tolerances The specification of acceptable variations in register, density, dot size, plate or paper thickness, concentration of chemicals, and other printing parameters.

Toner In digital printing, imaging material also called digital inks, used in plateless printing systems such as electrophotography, magnetography, ion or electron deposition, and laser printers. Toner must hold or conduct an electrical charge. In inks, dye used to tone printing inks, especially black.

Tone reproduction The tonal relationship between all the elements of a reproduction.

Toning See scum.

Tooth A characteristic of paper, a slightly rough finish, that permits it to take ink readily.

Trade printers (as in "we print for the trade) - they serve other printers, not you or me.

Transparency Color positive film. In digital imaging, a computer capability to make graphics and images transparent so that underlying graphics and images show through.

Transparent copy In photography, illustrative copy such as a color transparency or positive film through which light must pass in order for it to be seen or reproduced.

Transparent ink A printing ink that does not conceal the color beneath. Process inks are transparent so that they will blend to form other colors.

Transpose To exchange the position of a letter, word, or line with another letter, word or line.

Trapping In printing, the ability to print a wet ink film over previously printed ink. Dry trapping is printing wet ink over dry ink. Wet trapping is printing wet ink over previously printed wet ink. In prepress, refers to how much overprinting colors overlap to eliminate white lines between colors in printing. See spreads and chokes.

Transpromo A document that is the marriage of a piece of transactional printing with promotional or marketing content - all in the same document.

Trim marks Marks placed on the copy to indicate the edge of the page.

Twin-wire machine In papermaking, a fourdrinier paper machine with two wires instead of one producing paper with less two-sidedness.

Two-sidedness The property denoting difference in appearance and printability between its top (felt) and bottom (wire) sides.

Type gauge A printer's tool calibrated in picas and points used for type measurement. Rarely seen nowadays.

Type high is a letterpress term. It refers to the depth from top to bottom of the letterpress slug of type. I think the measurement is .914" and it also is used as a measurement in embossing depth.