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Using the ColorChecker color rendition chart
The ultimate goal of any process of photography, electronic publishing, printing, or television is to reproduce
all colors perfectly. However, color rendition is a very subjective matter.
To help make meaningful judgments about color rendition, a totally non-subjective standard of comparison is
needed. The ColorChecker chart provides the needed standard with which to compare, measure and
analyze differences in color reproduction in various processes.
The ColorChecker is a checkerboard array of 24 scientifically prepared colored squares in a wide range of
colors. Many of these squares represent natural objects of special interest, such as human skin, foliage and
blue sky. These squares are not only the same color as their counterparts, but also reflect light the same
way in all parts of the visible spectrum. Because of this unique feature, the squares will match the colors of
natural objects under any illumination and with any color reproduction process.
The ColorChecker chart provides an easy way to recognize and evaluate the many factors that can affect
color reproduction. To evaluate the effect of varying any given factor, simply compare the chart´s color image
as it appears on the photograph, television picture, computer monitor, or printed sample - with the actual
ColorChecker. This comparison may be made visually or through optical density measurements.
The ColorChecker is proportioned so inpidual squares are large enough to be measured with a
densitometer. Many variables may influence the kind of light reflected by the ColorChecker. These include
the spectral nature of the light sources and of nearby objects that may reflect light toward the chart or
otherwise affect the illumination. Also, camera lenses may be slightly colored, or may gather stray light from
outside the ColorChecker. The type of film, equipment, processing, and (in graphic arts reproduction) printing
ink may likewise affect color rendition. Even the very appearance of the ColorChecker and its imaged copy
may be influenced by viewing conditions.
We mention these variables so that when you use the ColorChecker, you will be aware of them and take
steps to control them. In this way, you will be able to know which differences in color rendition can be
ascribed to which parts of your system. Clearly, you may need to make a number of controlled test to
account for the unintentional variations in process.
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