Transcript Chapter 11

Chapter 11
Adjusting Colors
© 2011 Delmar, Cengage Learning
Chapter Lessons
• Correct and adjust color
• Enhance colors by altering
saturation
• Modify color channels using levels
• Create color samplers with the Info
panel
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Enhancing Color
• Use color-enhancing tools to change the
mood or personality of a color by changing
its tonal values
• Tonal values (also called color levels):
– Numeric values of an individual color
– Used to duplicate a color
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Reproducing Colors
• Use color adjustment tools to specify
exactly how colors should appear when
printed
• Colors levels are modified by making
adjustments to the input and output levels
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Correct and Adjust Color
• Balancing color:
– Add and subtract colors from those
already existing in a layer
– Correct oversaturated or undersaturated
color
– Remove color casts from an image
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Color Balance Dialog Box
• Contains three sliders:
– Cyan-Red
– Magenta-Green
– Yellow-Blue
• Adjust colors by dragging sliders or
typing values in the Color Levels
text boxes
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Modifying Curves
• Alter the output tonal value of any pixel
input
• Change as many as 16 points along the 0255 scale in the Curves Adjustments
panel
– Horizontal axis: original intensity
values (Input levels)
– Vertical axis: modified color values
(Output levels)
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Curves Settings
Active Setting
Values for
Active Setting
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Analyzing Colors
• Create an adjustment layer
• Experiment with color corrections:
– Adjust the color sliders and view
changes to the image
– Modify the curves
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Variations Dialog Box
• In the Variations
dialog box, view
thumbnails of
color variations
while making color
adjustments
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Enhance Colors by Altering
Saturation
• Purity of a particular color
• The higher the saturation level, the
more intense the color
• Modify color saturation using:
– The Hue/Saturation dialog box
– Sponge tool
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Using the Sponge Tool
• Use to increase or decrease the
color saturation of a specific area
within a layer
• Sponge tool settings include:
– Brush size
– Saturation or de-saturation levels
– Speed with which the color flows into
or from the Sponge tool
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Saturation Example
Reds
Saturated
After
Before
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Understanding Hue
• Hue is the amount of color that is
reflected from an object
– Assigned a measurement from 0 to
360 degrees
– Described in terms of tints or shades
(red, yellow-green, blue, gold, etc.)
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Adjusting Hue/Saturation
• In the Hue/Saturation dialog box
use the following sliders:
– Hue
– Saturation
– Lightness
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Converting to Grayscale
• Use the
Hue/Saturation
settings to apply
grayscale tones to
an object in an
image
Object in
Grayscale
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Modify Color Channels Using
Levels
• Use the Levels settings to make
adjustments across a tonal range:
– Uses the composite color channel or
individual channel
• The Levels feature uses a histogram
and displays light and dark color
values on a linear scale
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Histograms
• A graph that represents the frequency
distribution of colors in an image
• Adjustments are made to the input and
output levels
• Plotted data indicates the total number of
pixels for a given tonal value
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Levels Dialog Box
Histogram
showing
plotted data
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Using Sliders
•
Levels settings contains six sliders
that are used to make color
adjustments:
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•
•
•
•
Shadows slider
Midtones slider
Highlights slider
Output shadows slider
Output highlights slider
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Create Color Samples with the
Info Panel
• Use the Color Sampler tool to sample
and store up to four distinct color
samples
– Apply each of the four color samples to
an image
– Use the samples to make color
adjustments
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Color Samples
• Each sample represented by a
number
Sample 1
Sample 2
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Info Panel
• Displays the following information:
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–
–
–
Actual color values for current color mode
CMYK values
X & Y coordinates of the pointer location
Width and height of a selection
• Info panel expands to show color
measurement information when a color
sample is created
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Info Panel
RGB Color
Values
Pointer
Coordinates
CMYK Color
Values
Width &
Height
Color
Samplers
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Manipulating Color Samplers
• Move a color sampler by dragging
the sampler icon to a new
location:
– Color value information is updated in
the Info panel
• Delete any of the samplers
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