Sony UPX-DP10 Mode D'emploi page 75

Understanding the color adjustment
functions
The COLOR GUIDE function gives a rough direction
of color adjustment. The COLOR GUIDE function
becomes more useful when the user considers the
following points:
Complementary colors
A picture consists of data on three colors (R, G, and
B). On the station, colors are converted by changing
the balance of these three colors.
When the R parameter is to be changed, the LCD
shows CYN-RED (cyan and red). Similarly, the LCD
shows MAG-GRN (magenta and green) for the G
parameter and YEL-BLU (yellow and blue) for the B
parameter.
These combinations — cyan and red, magenta and
green, and yellow and blue — represent
complementary colors. For instance, increasing RED
means decreasing CYN, and decreasing RED means
increasing CYN.
Difference of + and - options
When COLOR GUIDE:1 is printed with all three RGB
parameters set to 0, seven images are printed. The
center picture is the reference picture with all three
RGB parameters set to 0, and each of the surrounding
six pictures has one of the three parameters set to +3 or
-3. This section explains what the + and - represent.
A picture consists of RGB data, which is a numeric
representation of the intensity of light of each color. A
+ sign means strengthening the light, while a - sign
means weakening the light. A notable phenomenon on
the + side is saturation of data (light). This
phenomenon is very useful when the background has
to be white, as white remains white even when the
value is increased to the + side.
1 Tips
Setting the R parameter to +3, for instance, means
strengthening the RED element of light. Therefore, the
picture looks reddish overall. In addition, the picture
becomes brighter because the total amount of light
increases.
However, some portions remain unchanged. These are
the portions that totally lack the RED element, for
instance, pure green, pure cyan, pure blue, neutral tints
in between, or total black, and the portions where the
RED element has saturated on the picture, for instance,
pure reddish purple (magenta), pure red, pure yellow,
neutral tints in between, or total white.
1 Tips
Setting the R parameter to -3, for instance, means
weakening the RED element of light. Therefore, the
picture looks tinged with cyan, which is the
complementary color of red. In addition, the picture
becomes darker because the total amount of light
decreases.
Unlike the + case, the overall picture is tinged with
cyan including those portions where the RED element
has saturated, for instance, pure reddish purple
(magenta), pure red, pure yellow, neutral tints in
between, or total white. A white background or clothes
look tinged, too.
Example 1: Taking yellowness
To take yellowness from the subject, COLOR
GUIDE:1 advises you to shift the B parameter to the +
side.
Example 2: Adding yellowness
To add yellowness to the subject, COLOR GUIDE:1
advises you to shift the B parameter to the - side.
However, it should be noted that even a white portion
becomes yellowish. To avoid this effect, shift the L
parameter to the + side as much as the shifting of the B
parameter to the - side. In effect, this is the same as
shifting the R and G parameters to the + side without
changing the B parameter. Here, it should be noted that
the overall brightness increases.
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