Halation:
A spreading or reflection of light, a halo-like effect that occurs in reverse reading letters, where the background is significantly darker than the illuminated letters.
Halftone:
The process of converting images into a regular array of dots of various sizes with equal spacing between centers. Also the process of reproducing an image as a series of dots of various sizes within a fixed grid.
Halation:
A spreading or reflection of light, a halo-like effect that occurs in reverse reading letters, where the background is significantly darker than the illuminated letters.
Halftone:
The process of converting images into a regular array of dots of various sizes with equal spacing between centers. Also the process of reproducing an image as a series of dots of various sizes within a fixed grid
Halftone:
The pr within a fixed grid.
Halo:
A ring of light, the effect achieved by reverse channel letters, which appear to be ringed by light because the light source is reflecting on the background from which the letters are pinned out.
Halo Lighting:
Typically used for back-lit letters (reverse-pan channel letters) to create a glow of light around the letter by illuminating the wall surface from within the letterform.
Hand-Cut:
A method for making a screen-printing stencil where a knife is used to manually cut a design into a film temporarily affixed to a support sheet.
Handicapped:
This word is no longer used and is considered offensive. See disabled access..
Hanging Sign:
A double-face sign that hangs from a bracket or support and projects from a wall, building or pole. See also projecting sign.
Header:
A separate board above the rest of a sign that gives it a headline or contains a different advertising message for the same product. Most often seen in point-of-purchase advertising.
Heat-Activated:
A type of adhesive that isn't sticky at room temperature but undergoes a chemical transformation when heated.
Heat-Bending:
The process of heating any thermoform plastic, such as PVC boards, acrylics, laminates, etc., and then bending them to desired shapes.
Height:
The vertical distance from the grade to the highest point of the sign face. Sign codes often limit allowable height of signs.
Height Above Grade:
See clearance.
High-Pressure Laminates:
Papers impregnated with thermosetting melamine and phenolic resins bonded at high temperatures (some well-known brands are Formica, Wilson Art, and Nevamar, for example) which are available in sheet sizes up to 48" x 144" x 1/16" and come in dozens of standard colors and patterns. Now available with custom digital artwork embedment suitable for outdoor use as well.
Hinged Side:
The face on a double-face sign that swings open for service.
Hinging:
A vinyl installation process where a cut vinyl image, the carrier liner and the transfer tape are placed on the target surface; a piece of masking tape is then attached to the top edge of the transfer tape. The liner is then slowly rolled off from the top edge and then the transfer tape (and vinyl image) are slowly smoothed onto the surface. A variation of this is to leave an exposed strip of transfer tape above the top edge of the liner, instead of separate piece of masking tape, to act as a hinge.
Histogram:
A graphic display that represents the distribution of tones within an image.
Housing:
Made from porcelain or Pyrex glass, a housing is mounted in the sign and provides the contact between the electrode and the lead-in wire.
Hue:
A particular variety of a color, such as a tint or shade. One of the components of color that can be specified by particular wavelengths.
Hydro Cutting:
See water jet cutting.
