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2 Glossary
Floating selectionFloating selection
A selected area that can be deleted or moved without
affecting the underlying image. Like a sticky note, it can
be moved around without changing the image.
GIFGIF
Graphics Interchange Format. A standard file format for
color and grayscale images, originally designed by
CompuServe.
GrayscaleGrayscale
An image with 256 gray shades.
HalftoneHalftone
An image composed of evenly spaced color or gray dots,
of varying size. Halftone images are prepared—usually
through a photographic process—for printing purposes.
HighlightsHighlights
The brightest parts of an image.
HistogramHistogram
A special type of line chart that shows the color
distribution of images by representing the number of
pixels with given brightness values.
HSVHSV
A color model that defines these color elements: hue,
saturation, and brightness. Also called HSB.
HueHue
The color characteristic that determines what part of
the spectrum a color belongs to.
Image data typeImage data type
Describes the pixel and color information of an image.
Usually in two parts: bit depth (“24-bit”) and color
model type (“RGB”).
Indexed color imageIndexed color image
An image that is converted to 16 or 256 colors.
JPG (JPEG) JPG (JPEG)
Joint Photographic Experts Group. A file format that
encodes color or grayscale images into compressed form.
Line artLine art
Black and white image with no gray.
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