This class enables you to correct brightness and contrast of the image.

Namespace: Aurigma.GraphicsMill.Transforms
Assembly: Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)

Syntax

Visual Basic

Public NotInheritable Class BrightnessContrast _
	Inherits PerChannelBitmapTransform

C#

public sealed class BrightnessContrast : PerChannelBitmapTransform

Remarks

This class provides simple brightness and contrast adjustment functionality. Being extremely easy-to-use for end user, it is used by professional retouchers very seldom (because as usual it leads to losses of details in highlights and/or shadows).

It provides two parameters - brightness modifier (BrightnessAmount property) and contrast modifier (ContrastAmount property).

If you want to modify only brightness or contrast, you can use Brightness or Contrast transform. It will work slightly faster.

Examples

Visual Basic

Dim brightnessContrast As New Aurigma.GraphicsMill.Transforms.BrightnessContrast
brightnessContrast.BrightnessAmount = 0.2F
brightnessContrast.ContrastAmount = -0.1F
brightnessContrast.ApplyTransform(bitmap)

C#

Aurigma.GraphicsMill.Transforms.BrightnessContrast brightnessContrast = 
    new Aurigma.GraphicsMill.Transforms.BrightnessContrast();
brightnessContrast.BrightnessAmount = 0.2f;
brightnessContrast.ContrastAmount = -0.1f;
brightnessContrast.ApplyTransform(bitmap);

Thread Safety

Static members of this type are safe for multi-threaded operations. Instance members of this type are safe for multi-threaded operations.

Supported Pixel Formats

Member NameDescription
Format8bppGrayScale8 bits per pixel. Grayscale. 8 bits are used for luminosity level.
Format16bppGrayScale16 bits per pixel. Grayscale. All 16 bits are used for luminosity level (extended pixel format).
Format16bppAGrayScale16 bits per pixel. Grayscale with alpha channel. 8 bits are used for alpha channel and other 8 bits are used for luminosity level.
Format32bppAGrayScale32 bits per pixel. Grayscale with alpha channel. 16 bits are used for alpha channel and other 16 bits are used for luminosity level (extended pixel format).
Format24bppRgb24 bits per pixel. RGB. 8 bits each are used for the red, green, and blue components.
Format32bppRgb32 bits per pixel. RGB. 8 bits each are used for the red, green, and blue components. The rest 8 bits are unused.
Format32bppArgb32 bits per pixel. RGB with alpha channel. 8 bits each are used for the alpha, red, green, and blue components.
Format48bppRgb48 bits per pixel. RGB. 16 bits each are used for the red, green, and blue components (extended pixel format).
Format64bppArgb64 bits per pixel. RGB with alpha channel. 16 bits each are used for the alpha, red, green, and blue components (extended pixel format).
Format32bppCmyk32 bits per pixel. CMYK. 8 bits each are used for the cyan, magenta, yellow, and black components.
Format64bppCmyk64 bits per pixel. CMYK. 16 bits each are used for the cyan, magenta, yellow, and black components (extended pixel format).
Format80bppAcmyk80 bits per pixel. CMYK with alpha channel. 16 bits each are used for the alpha, cyan, magenta, yellow, and black components (extended pixel format).