Change Image Opacity
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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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