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abe238/ChangeOpacity

Created Jun 29, 2015
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Change Image Opacity
public static Bitmap ChangeOpacity(Image img, float opacityvalue)
{
Bitmap bmp = new Bitmap(img.Width, img.Height);
Graphics graphics = Graphics.FromImage(bmp);
ColorMatrix colormatrix = new ColorMatrix();
colormatrix.Matrix33 = opacityvalue;
ImageAttributes imgAttribute = new ImageAttributes();
imgAttribute.SetColorMatrix(colormatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
graphics.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttribute);
graphics.Dispose();
return bmp;
}
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