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The two images below will be used throughout this part of the web site.
The first is a color chart as shown in Figure 1. There are eight rows
labeled A through H. Row A is the color red. Row B is green.
Row C is blue. Row D is cyan. Row E is magenta. Row F is
yellow. Row G is grayscale. Row H is a series of mixed colors.

The columns for rows A through G approximate the Zone System. Column X,
all rows, has the same Curves value of 255. Column IX, rows A through G,
has the same Curves value of 230. Column VIII, rows A through G, has the
same Curves value of 204. Column VII, rows A through G, has the same
Curves value of 179. Column VI, rows A through G, has the same Curves
value of 153. Column V, rows A through G, has the same Curves value of
127. Column IV, rows A through G, has the same Curves value of 102.
Column III, rows A through G, has the same Curves value of 77. Column II,
rows A through G, has the same Curves value of 51. Column I, rows A
through G, has the same Curves value of 26. Column 0, all rows, has the
same Curves value of 0.

The second image, Figure 2, is of flowering shrubs and trees. I chose
this image because it contains the primary colors and their complements.
The sky is blue and cyan. The pine trees and grass are green. The
smallest flowering shrub has red flowers. The redbud tree flowers are
magenta. The flowering forsythia is yellow.

To show what these images look like in black and white, they were converted
using one of the Tone Management System methods that retains
measured luminance. The result is in Figure 3. As we can see in
the chart, since column IX, rows A - G had the same Curves tone, they were
converted to the same black and white tone, which is as expected. The same
is true for columns VIII to 0. As a reminder, the column title, X to 0 is
the Zone System number. Row H contains selected colors and the tones are
not the same as in the rest of the columns. To recap, Figure 3 is an
accurate conversion of tone as measured by the Curves control.

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