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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

CurveChannel

AdjustmentIntensity

CurveAdjustment (4 bytes): A 32-bit unsigned integer that specifies the curve adjustment to apply to the colors in bitmap. This value MUST be defined in the CurveAdjustments enumeration (section 2.1.1.7).

CurveChannel (4 bytes): A 32-bit unsigned integer that specifies the color channel to which the curve adjustment applies. This value MUST be defined in the CurveChannel enumeration (section 2.1.1.8).

AdjustmentIntensity (4 bytes): A 32-bit 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:

Exposure adjustment range:

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.

Density adjustment range:

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.

Contrast adjustment range:

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.

Highlight adjustment range:

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.

Shadow adjustment range:

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.

White saturation adjustment range:

Value Meaning

0 — 255

As the value increases, the upper limit of the range of color channel intensities increases.

Black saturation adjustment range:

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.

 
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