BitmapDataExtensionsAdjustContrast(IReadWriteBitmapData, Single, IDitherer, ColorChannels, ParallelConfig) Method

public static bool AdjustContrast(
	this IReadWriteBitmapData bitmapData,
	float contrast,
	IDitherer? ditherer,
	ColorChannels channels,
	ParallelConfig? parallelConfig
)

<ExtensionAttribute>
Public Shared Function AdjustContrast ( 
	bitmapData As IReadWriteBitmapData,
	contrast As Single,
	ditherer As IDitherer,
	channels As ColorChannels,
	parallelConfig As ParallelConfig
) As Boolean

public:
[ExtensionAttribute]
static bool AdjustContrast(
	IReadWriteBitmapData^ bitmapData, 
	float contrast, 
	IDitherer^ ditherer, 
	ColorChannels channels, 
	ParallelConfig^ parallelConfig
)

[<ExtensionAttribute>]
static member AdjustContrast : 
        bitmapData : IReadWriteBitmapData * 
        contrast : float32 * 
        ditherer : IDitherer * 
        channels : ColorChannels * 
        parallelConfig : ParallelConfig -> bool 

Parameters

bitmapData  IReadWriteBitmapData

The IReadWriteBitmapData to be transformed.

contrast  Single

A float value between -1 and 1, inclusive bounds. Positive values increase the contrast, while negative values decrease it.

ditherer  IDitherer

An optional IDitherer instance to dither the result of the transformation if the transformed colors are not compatible with the PixelFormat of the specified bitmapData.

channels  ColorChannels

The ColorChannels, on which the adjustment has to be performed.

parallelConfig  ParallelConfig

The configuration of the operation such as parallelization, cancellation, reporting progress, etc. When Progress is set in this parameter, then this library always passes a DrawingOperation instance to the generic methods of the IAsyncProgress interface. If , then the degree of parallelization is configured automatically.

Return Value

Usage Note

If bitmapData has an indexed PixelFormat and ditherer is , then its palette entries are tried to be transformed instead of the actual pixels in the first place (if it is supported by bitmapData). To transform the colors of an indexed IBitmapData without changing the palette specify a non- ditherer. Transforming the palette is both faster and provides a better result.

If ditherer is , this method attempts to preserve the original color depth, including wide pixel formats.

The ditherer may have no effect for KnownPixelFormats with more than 16 bits-per-pixel and for grayscale formats.

Reference