2.2.3.4 ColorCurveEffect Object
The ColorCurveEffect object specifies one of eight adjustments to the color curve of an image.
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CurveAdjustment |
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CurveChannel |
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AdjustmentIntensity |
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CurveAdjustment (4 bytes): An unsigned integer that specifies the curve adjustment to apply to the colors in bitmap. This value is defined in the CurveAdjustments enumeration (section 2.1.1.7).
CurveChannel (4 bytes): An unsigned integer that specifies the color channel to which the curve adjustment applies. This value is defined in the CurveChannel enumeration (section 2.1.1.8).
AdjustmentIntensity (4 bytes): A signed integer that specifies the intensity of the curve adjustment to the color channel specified by CurveChannel. The ranges of meaningful values for this field vary according to the CurveAdjustment value, as follows:
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Exposure adjustment range:
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Value
Meaning
-255 ≤ value < 0
As the value decreases, the exposure of the image SHOULD decrease.
0
A value of 0 specifies that the exposure MUST NOT change.
0 < value ≤ 255
As the value increases, the exposure of the image SHOULD increase.
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Density adjustment range:
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Value
Meaning
-255 ≤ value < 0
As the value decreases, the density of the image SHOULD decrease, resulting in a darker image.
0
A value of 0 specifies that the density MUST NOT change.
0 < value ≤ 255
As the value increases, the density of the image SHOULD increase.
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Contrast adjustment range:
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Value
Meaning
-100 ≤ value < 0
As the value decreases, the contrast of the image SHOULD decrease.
0
A value of 0 specifies that the contrast MUST NOT change.
0 < value ≤ 100
As the value increases, the contrast of the image SHOULD increase.
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Highlight adjustment range:
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Value
Meaning
-100 ≤ value < 0
As the value decreases, the light areas of the image SHOULD appear darker.
0
A value of 0 specifies that the highlight MUST NOT change.
0 < value ≤ 100
As the value increases, the light areas of the image SHOULD appear lighter.
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Shadow adjustment range:
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Value
Meaning
-100 ≤ value < 0
As the value decreases, the dark areas of the image SHOULD appear darker.
0
A value of 0 specifies that the shadow MUST NOT change.
0 < value ≤ 100
As the value increases, the dark areas of the image SHOULD appear lighter.
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Midtone adjustment range:
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Value
Meaning
-100 ≤ value < 0
As the value decreases, the midtones of the image SHOULD appear darker.
0
A value of 0 specifies that the midtone MUST NOT change.
0 < value ≤ 100
As the value increases, the midtones of the image SHOULD appear lighter.
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White saturation adjustment range:
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Value
Meaning
0 — 255
As the value increases, the upper limit of the range of color channel intensities increases.
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Black saturation adjustment range:
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Value
Meaning
0 — 255
As the value increases, the lower limit of the range of color channel intensities increases.
Bitmap images are specified by EmfPlusBitmap objects (section 2.2.2.2).
See section 2.2.3 for the specification of additional image effects parameter objects.