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COLORADJUSTMENT structure (wingdi.h)

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The COLORADJUSTMENT structure defines the color adjustment values used by the StretchBlt and StretchDIBits functions when the stretch mode is HALFTONE. You can set the color adjustment values by calling the SetColorAdjustment function.

Syntax

typedef struct tagCOLORADJUSTMENT {
  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, *PCOLORADJUSTMENT, *LPCOLORADJUSTMENT;

Members

caSize

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

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

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

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

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

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

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

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 toward red and negative numbers adjust toward green. Zero means no tint adjustment.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Header wingdi.h (include Windows.h)

See also

Bitmap Structures

Bitmaps Overview

GetColorAdjustment

SetColorAdjustment

SetStretchBltMode

StretchBlt

StretchDIBits