This class enables you to set alpha values of pixels with specified colors (and tolerant ones) to transparent.

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

Syntax

Visual Basic

Public NotInheritable Class Transparentize _
	Inherits BitmapTransform

C#

public sealed class Transparentize : BitmapTransform

Remarks

This transform is very useful when you need to blend two images and "upper" image does not have alpha channel, but it has a background color. For example, you draw a logo placed in the center of the image on white background. In this case you set TransparentColor to white color. You can also adjust a Tolerance parameter to make colors close to white color be semi-transparent (to get smooth colors). Besides of that Tolerance is useful when background color is not completely uniform (for example, you loaded JPEG file with low quality).

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
Format1bppIndexed1 bit per pixel. Indexed.
Format4bppIndexed4 bits per pixel. Indexed.
Format8bppIndexed8 bits per pixel. Indexed.
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).