141. The number of tone-contrasts—contrasts of value, of color, and of
color-intensity or neutralization—is, evidently, beyond calculation.
The method of describing any particular contrast or contrasts is easy
to understand. We have only to define the tones and to indicate how
they cross one another.
RO, ½N
---------
VR
This formula means that a spot of Violet-Red (Dark, full intensity) is
put on a ground-tone of Middle Red-Orange, half neutralized.
RO½
----------
VR Wt
--
YG
This formula means that spots of Low Dark Violet-Red (full
intensity) and White are put on a ground-tone of Middle Red-Orange,
half intensity, and that on the spot of Low Dark Violet-Red (full
intensity), as a ground-tone, is put a spot of Light Yellow-Green
(full intensity). It is not necessary to name the value when the
color occurs in the value of its greatest intensity, and it is not
necessary to describe the intensity, in any value, when the greatest
intensity possible to that value is meant. In the first case the value
is understood, in the second case the intensity—the greatest for the
value—is understood.