ImageGear for .NET
ConvertColorSpace(ImGearRasterPage,ImGearColorSpace,ImGearPixel) Method
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ImageGear21.Core Assembly > ImageGear.Processing Namespace > ImGearRasterProcessing Class > ConvertColorSpace Method : ConvertColorSpace(ImGearRasterPage,ImGearColorSpace,ImGearPixel) Method




page
Image to change color space.
newColorSpace
New color space.
backgroundColor
Background to composite the image over when removing alpha channel.

Glossary Item Box

Converts page to a new color space, using the specified background color for images that contain Alpha channel.

Syntax

 
Visual Basic
C#
Managed Extensions for C++
C++/CLI
 
 

Parameters

page
Image to change color space.
newColorSpace
New color space.
backgroundColor
Background to composite the image over when removing alpha channel.

Remarks

If conversion removes the alpha channel from the image, the image is composited over a solid background specified by BackColor. Background should be in the same color space as the original image, but without the Alpha channel. For example, if the original image is in RGBA color space and newColorSpace is CMYK, background should have an RGB color space. The method will first transform the image into RGB and then to CMYK.

The following formula is used to burn alpha (i.e., to convert from RGBA/P to RGB):

If Page is not pre-multiplied:

I = I * A + B (1-A)

If Page is pre-multiplied:

I = I + B (1-A)

If the image contains extra channels, and newColorSpace contains extra channels, the method does not change them.

Note: Conversion to Grayscale colorspace takes into account human eye's sensitivity to different parts of the light spectrum. ImageGear uses the following formula when converting from RGB to Grayscale: Gray = Red * 77 / 255 + Green * 151 / 255 + Blue * 28 / 255. If you need to convert an image to Grayscale using equal weights for Red, Green and Blue, or any other weights, use ConvertColorSpace(ImGearRasterPage,ImGearColorSpace,Double[,])

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