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