How to C#: Imaging
Using Imaging SDK for C#.NET
Winforms Controls
Image Load
Image Access and Modify
Alpha Channel Edit
Alpha Channel Edit
Home ›› XImage.Raster ›› C# Raster: Modify Alpha Channel

How to C#: Modify Alpha Channel

Overview for How to Modify Alpha Channel


By using the XImage.Raster SDK, you can add alpha channel to 24bpp image and convert it to 32bpp image. Conversely, you can remove 32bpp image's depth channel and convert it to 24bpp image.

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Steps to Modify Alpha Channel

Load an image with RasterImage object.

Create an image processor with ImageProcess object.

Call the AddAlphaChannel method of ImageProcess object to complete the task flopping image.

Save the modified image to an image file on the disk.

In order to acheive the work, please refer to the following steps.

Install XImage.Raster in C# Project

Add necessary references to your C#.NET project. Right-click the project and select "Add Reference..." to locate and add the following DLLs as project references;




Use corresponding namespaces;

  using RasterEdge.XImage.Raster;

Note: When you get the error "Could not load file or assembly 'RasterEdge.Imaging.Basic' or any other assembly or one of its dependencies. An attempt to load a program with an incorrect format", please check your configure as follows:


       If you are using x64 libraries/dlls, Right click the project -> Properties -> Build -> Platform target: x64.


       If using x86, the platform target should be x86.

Modify Alpha Channel

Sample Code (modify alpha channel):

RasterImage img = new RasterImage(@"F:\input.png");
ImageProcess process = new ImageProcess(img);
//add alpha channel to 24bpp image.