Pentax *istD Operating Manual page 162

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TIFF
A format for saving image data in a non-compressed format. Image data
using this format has a large file size and is not suited for attaching to e-
mail, but is suited for processing on your PC.
Color Temperature
This numerically expresses the color of the light source illuminating the
subject. This is indicated in absolute temperature, using Kelvin (K) units.
The color of light shifts to a bluish color as the color temperature rises, and
to a reddish color as the color temperature falls.
Color space
A system that organizes colors. Colors displayed on displays for PCs and
televisions are rendered with combinations of RGB (red, green, blue), and
those for color printed materials, such as pamphlets, are rendered with
combinations of CMYK (cyan, magenta, yellow, black). Color space is the
method in which specific colors are rendered through a certain method.
Quality Level
This refers to the image compression ratio. The lower the compression,
the more detailed the image. The image becomes rougher as the
compression rate rises.
Recorded Pixels
Indicates the size of the image by the number of pixels. The more pixels
8
that compose a picture, the larger the image size.
Histogram
Graphed presentation of a gradation sequence that shows the darkest
point in an image to the brightest. The horizontal axis represents the
brightness and the vertical axis represents the number of pixels. This is
useful when you wish to refer to the exposure status of an image.