COLORADJUSTMENT

The COLORADJUSTMENT structure defines the color adjustment values used by the StretchBlt and StretchDIBits functions when the stretch mode is HALFTONE.

typedef struct tagCOLORADJUSTMENT { // ca

WORD caSize;

WORD caFlags;

WORD caIlluminantIndex;

WORD caRedGamma;

WORD caGreenGamma;

WORD caBlueGamma;

WORD caReferenceBlack;

WORD caReferenceWhite;

SHORT caContrast;

SHORT caBrightness;

SHORT caColorfulness;

SHORT caRedGreenTint;

} COLORADJUSTMENT;

Members

caSize

Specifies the size, in bytes, of the structure.

caFlags

Specifies how the output image should be prepared. This member may be set to NULL or any combination of the following values:

Value	Meaning
CA_NEGATIVE	Specifies that the negative of the original image should be displayed.
CA_LOG_FILTER	Specifies that a logarithmic function should be applied to the final density of the output colors. This will increase the color contrast when the luminance is low.

caIlluminantIndex

Specifies the type of standard light source under which the image is viewed. This member may be set to one of the following values:

Value	Meaning
ILLUMINANT_DEVICE_DEFAULT	Device's default. Standard used by output devices.
ILLUMINANT_A	Tungsten lamp.
ILLUMINANT_B	Noon sunlight.
ILLUMINANT_C	NTSC daylight.
ILLUMINANT_D50	Normal print.
ILLUMINANT_D55	Bond paper print.
ILLUMINANT_D65	Standard daylight. Standard for CRTs and pictures.
ILLUMINANT_D75	Northern daylight.
ILLUMINANT_F2	Cool white lamp
ILLUMINANT_TUNGSTEN	Same as ILLUMINANT_A.
ILLUMINANT_DAYLIGHT	Same as ILLUMINANT_C.
ILLUMINANT_FLUORESCENT	Same as ILLUMINANT_F2.
ILLUMINANT_NTSC	Same as ILLUMINANT_C.

caRedGamma

Specifies the nth power gamma-correction value for the red primary of the source colors. The value must be in the range from 2500 to 65,000. A value of 10,000 means no gamma-correction.

caGreenGamma

Specifies the nth power gamma-correction value for the green primary of the source colors. The value must be in the range from 2500 to 65,000. A value of 10,000 means no gamma-correction.

caBlueGamma

Specifies the nth power gamma-correction value for the blue primary of the source colors. The value must be in the range from 2500 to 65,000. A value of 10,000 means no gamma-correction.

caReferenceBlack

Specifies the black reference for the source colors. Any colors that are darker than this are treated as black. The value must be in the range from 0 to 4000.

caReferenceWhite

Specifies the white reference for the source colors. Any colors that are lighter than this are treated as white. The value must be in the range from 6000 to 10,000.

caContrast

Specifies the amount of contrast to be applied to the source object. The value must be in the range from 100 to 100. A value of 0 means no contrast adjustment.

caBrightness

Specifies the amount of brightness to be applied to the source object. The value must be in the range from 100 to 100. A value of 0 means no brightness adjustment.

caColorfulness

Specifies the amount of colorfulness to be applied to the source object. The value must be in the range from 100 to 100. A value of 0 means no colorfulness adjustment.

caRedGreenTint

Specifies the amount of red or green tint adjustment to be applied to the source object. The value must be in the range from 100 to 100. Positive numbers adjust towards red and negative numbers adjust towards green. Zero means no tint adjustment.

See Also

SetStretchBltMode, StretchBlt, StretchDIBits

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