24 A-61506 September 2006
Appendix A Color Concepts
What is a color
image?
A digital color image contains information about a scanned document
subdivided into many small regions called pixels (picture elements).
Each pixel is represented as a 24-bit value. These 24 bits are used to
indicate the amount of red, green and blue for each pixel. Pixels are
arranged in a matrix to collectively represent the image. Each pixel
represents a single color, present at that location in the image.
What is a color table? The color cameras in a scanner typically deliver three channels of data
to the image processing system, representing the Red, Green, and
Blue content of the image.
This raw data can then be fine-tuned to more closely represent the
original document by mapping raw input colors to the desired output
colors. This is usually done with a color table. The color table is simply
a list of input values matched to the desired output colors.
What is the
Brightness and
Contrast Control?
The purpose of the Brightness and Contrast Control is to provide a tool
whereby a user can adapt or develop a custom color table for a Kodak
Innovation Series Scanner, to suit the needs of a particular application.
The Brightness and Contrast Control provides a graphical user
interface which allows the user to preview the effect a color table will
have on a representative customer image. It can acquire a
representative image from the Kodak Innovation Series Scanner or
load it from a file. The utility provides tools which permit creating,
modifying and saving custom color tables.
