Acid-free paper
Paper which has had the acid removed from the pulp during production so that it has a neutral 7.0 pH.
Additive Color
The additive primary colors are red, blue and green. These three additive colors represent the three main components of white light in the additive color module. Black is produced by the absence of the primary colors. In theory, any color can be created by mixing these three colors.
Archival Paper
Archival paper is typically acid-free and has a quality lifetime of about 100 years or longer. This paper is used to keep critical records for many years.
Auto Trace
A function in graphic design software that automatically traces images. Paths are created along the edges of a scanned sketch. The paths are then cleaned up and the scanned file are discarded off. Now you have an outlined sketch of the image you scanned.
DPI (dots per inch)
DPI is the number of dots (or pixels - PPI) that fit horizontally and vertically into a one-inch measure. The more dots per inch, the more detail is captured and the sharper the image.
on-reproducible colors
Non-reproducible colors are colors present in an original photograph, that fall outside of the gamut.
true color system
A true color system is a 24-plane graphics subsystem which produces the entire range of 16.7 million colors.
YIQ
A color model sometimes used in television broadcast systems. Colors are separated into a luminance (Y) and 2 color values (I and Q).
value
With reference to color, the term is used to describe brightness.
HLS
A color space consisting of hue, lightness and saturation.
gamma
An adjustment that makes the tonal distribution lighter or darker. Gamma adjustments are made to monitors, scanners or during an image editing process.
quick mask
A screen display mode in Photoshop in which a translucent colored mask covers selected or unselected areas of an image.
resolution
The resolution of an image is an important factor in determining the attainable output quality. The higher the resolution of an image, the less pixilated it will be and the curves of the image will appear smoother.
LZW (Lemple-Zif-Welch)
A useful compression technique that compress images that contain large areas of single color, for example screenshots. This technique is supported by TIFF, GIF and PDF.
continuous tone
Black and white photographs often contain gradient tones from black to white which are called continuous tones.
gamut transformation
A function of Color Management Systems that converts out of gamut colors to colors within the gamut of the targeted printer.
filter
A filter is applied to images or art works to easily create special effects or to achieve a look that would be too difficult to create manually.
saturation
Saturation is the color intensity of an image. A color with high saturation will appear brighter and more vibrant than the same color with low saturation. Colors in grayscale images have no saturations (white, grays and black).
dither
The mixing of adjacent pixels to simulate additional colors to fill the gaps between two colors. For instance, if you want to display a full color graphic on a 256-color monitor, the computer will simulate the colors he cannot display. If there is a part in an image that displays incorrectly because a red and a yellow pixel are lying next to each other, creating a definite line from a distance, dithering would put an orange pixel in between to smooth out the line and the colors.
bevel
Bevel is a function in graphic design software that, when applied to an image, gives the image the appearance of being raised out of the surface. A common example is buttons on websites. The appearance of the bevel is created by the application of lighter and darker colors to the image.
control handle
The handle that extends from an anchor point that is used to create curved shapes in a path. Stretching the control handle will effect the depth of the curve.
Kerning
Adjusting the lateral (horizontal) space between letters.
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