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ColorLUTParams structure (gdipluseffects.h)

  • Article

A ColorLUTParams structure contains members (color lookup tables) that specify color adjustments to a bitmap.

You can apply a custom adjustment to a bitmap by following these steps.

  1. Create a ColorLUTParams structure.
  2. Each member of the ColorLUTParams structure is a color lookup table (array of 256 bytes) for a particular color channel, alpha, red, green, or blue. Assign values of your choice to the four lookup tables.
  3. Pass the address of the ColorLUTParams structure to the ColorLUT::SetParameters method of a ColorLUT object.
  4. Pass the address of the ColorLUT object to the Graphics::DrawImage method or to the Bitmap::ApplyEffect method.

Syntax

struct ColorLUTParams {
  ColorChannelLUT lutB;
  ColorChannelLUT lutG;
  ColorChannelLUT lutR;
  ColorChannelLUT lutA;
};

Members

lutB

Type: ColorChannelLUT

Array of 256 bytes that specifies the adjustment for the blue channel.

lutG

Type: ColorChannelLUT

Array of 256 bytes that specifies the adjustment for the green channel.

lutR

Type: ColorChannelLUT

Array of 256 bytes that specifies the adjustment for the red channel.

lutA

Type: ColorChannelLUT

Array of 256 bytes that specifies the adjustment for the alpha channel.

Remarks

A lookup table specifies how existing color channel values should be replaced by new values. A color channel value of j is replaced by the jth entry in the lookup table for that channel. For example, an existing blue channel value of 25 would be replaced by the value of lutB[25].

The ColorChannelLUT data type is defined in GdiplusColorMatrix.h as follows:

typedef BYTE ColorChannelLUT[256];

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header gdipluseffects.h (include Gdiplus.h)