This method adjusts the contrast of a bitmap image.

HRESULT AdjustContrast(
  FLOAT shadow,
  FLOAT highlight
);

Parameters

shadow

[in] A FLOAT value that defines the value for pixels that are currently 0.

highlight

[in] A FLOAT value that defines the value for pixels that are currently 1.

Return Values

This method returns S_OK if successful.

This method returns E_INVALIDARG if shadow > highlight.

Remarks

This method adjusts the contrast of an image by rescaling the pixel values in the range from 0 to 1 to the new range from shadow to highlight.

The old pixel value 0 is mapped to the new pixel value of shadow and the old pixel value 1 is mapped to the new pixel value of highlight. All other old pixel values are mapped into the new range through linear interpolation.

Requirements

OS Versions: Windows CE 5.0 and later.
Header: Imaging.h.
Link Library: Imaging.lib.

See Also

IBasicBitmapOps

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