YE0188 Color Rendition Chart (X-Rite ColorChecker) 24 color cheker
chart photograph color test chart passport charts
The YE0188 was designed with respect of the well- known
'ColorChecker'. Used in photography, film and TV, the chart
consists of 18 color patches and a 6-step gray scale.
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 individual 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.
1. Photograph the ColorChecker chart using color print film under
two different types of illumination to produce color prints.
Compare the images (or the measured reflection densities of
corresponding areas on the prints) to evaluate the effect of
changing illumination. Repeat the process using various filters.
2. Do the same as in # 1 above, but use two different types of
transparency film. Compare the slides visually or use a
densitometer to compare the transmission densities of corresponding
3. Photograph the ColorChecker chart using two different types of
color film. Then compare the slides or prints to the ColorChecker.
For critical comparison, standardized lighting, as found in X-Rite
lighting products, should be used. Slides should be viewed on a
standard transparency viewer and prints should be illuminated by a
5000K light source. The slides and prints can also be compared by
using a densitometer.
1. Make color separations and plates of the ColorChecker chart.
Print ink-on-paper copy of the ColorChecker chart. Compare the copy
to the original chart under standard viewing conditions, or compare
the measured reflection densities using a densitometer.
2. With this information, you can now make the necessary
adjustments for your color separation and/ or printing process.
1. Make a scan of the ColorChecker using the default settings of
your scanning software. Open scanned image in your image editing or
scan utility software, then measure and record the RGB values for
each patch in the ColorChecker image.
2. Compare these readings with those from a “pure” digital TIFF
file of the ColorChecker or from the table below. Calculate and
record the differences.
3. With this information, you can create a characterization profile
in either your image editing software or scan utility software.
This can be used to adjust all future scans to compensate for the
characteristics of your scanner.
1. Frame the ColorChecker chart with a video camera and adjust
several control monitors to display the chart identically.
2. View the ColorChecker chart with several video cameras (making
sure the lighting is always the same). Display the pictures on the
balanced monitors and adjust the cameras to make all of the
monitors match as closely as possible. The residual differences in
color rendition will be displayed on the monitors.
Color names and specifications are given in the table below. The
Munsell notations (which describe color in terms of hue, value, and
chroma) are widely used by artists, designers and color
technologists. The ISCC-NBS names are designated by a method
established by the Inter-Society Color Council and the National
Bureau of Standards of the USA. The assigned names are either names
of natural objects spectrally simulated, names of additive
primaries (red, green, and blue) and subtractive primaries (cyan,
magenta, and yellow), Munsell names (for the gray series), or
abbreviated ISCC-NBS names. A more in-depth technical description
of the chart can be found in the article “A Color Rendition Chart”
by C. S. McCamy, H. Marcus and J. G. Davidson, Journal of Applied
Photographic Engineering, Summer Issue 1976, Vol. 2, No. 3, pg.
Note: The user should be careful to avoid touching the colored
squares of the ColorChecker chart with fingers or objects that
might mar or soil the colors. Avoid exposing the ColorChecker chart
to light, except when it is in use. Also avoid exposing it to high
temperature, high humidity and chemical fumes. Depending on use, it
is recommended that you replace your ColorChecker chart every two
years to ensure correct color identification.
The values of the 11-graduated gray scale are as follows:
|Step||Density||Reflectance in %|
The density values are based on BaSo4 = 0. Two black fields and a
white field are located between the gray scales, the density of the
black filed is D > 2.4 (reflectance < 0.5 %). The density of
the white filed is D = 0.05 (reflectance = 89.9 %).