GDI+ Extensions

Contains extension methods to deal with Image classes.

PM> Install-Package Zavolokas.GdiExtensions -Version 1.0.0

Contents

1. Scaling
2. Opacity
3. Channels copy

Scaling

Clones an original image to a new one with changed size.

using (var bitmap = new Bitmap(pathToImageFile))
using (var scaled = bitmap.CloneWithScaleTo(300, 80))
{
    scaled
        .SaveTo(resultPath, ImageFormat.Png)
        .ShowFile();
}

Input image	Result

Opacity

Clones an original image to a new one with the opacity set to the specidied.

using (var image = new Bitmap(pathToImageFile))
using (var semiTransparent = image.CloneWithOpacity(0.3f))
{
    semiTransparent
        .SaveTo(resultPath, ImageFormat.Png)
        .ShowFile();
}

Input image	Result

Channels copy

Replaces channel values from a source RGBA image.

Note: The dest and source images should be of the same size.

using (var source = new Bitmap(pathToSrcImage))
using (var dest = new Bitmap(pathToDestImage))
{
    const int dstChannelIndex = 2;
    const int srcChannelIndex = 3;

    dest.CopyChannel(dstChannelIndex, source, srcChannelIndex)
        .SaveTo(resultPath, ImageFormat.Png)
        .ShowFile();
}

Dest	Src

Replace Red with Alpha	Replace Green with Alpha	Replace Blue with Alpha