A C# function for changing the opacity on an image to the specified value. It uses the System.Drawing, System.Drawing.Imaging and System.Drawing.Drawing2D namespaces.
1. public static Image SetImgOpacity(Image imgPic, float imgOpac)
2. {
3. Bitmap bmpPic = new Bitmap(imgPic.Width, imgPic.Height);
4. Graphics gfxPic = Graphics.FromImage(bmpPic);
5. ColorMatrix cmxPic = new ColorMatrix();
6. cmxPic.Matrix33 = imgOpac;
7.
8. ImageAttributes iaPic = new ImageAttributes();
9. iaPic.SetColorMatrix(cmxPic, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
10. gfxPic.DrawImage(imgPic, new Rectangle(0, 0, bmpPic.Width, bmpPic.Height), 0, 0, imgPic.Width, imgPic.Height, GraphicsUnit.Pixel, iaPic);
11. gfxPic.Dispose();
12.
13. return bmpPic;
14. }
Nathan Pakovskie is an esteemed senior developer and educator in the tech community, best known for his contributions to Geekpedia.com. With a passion for coding and a knack for simplifying complex tech concepts, Nathan has authored several popular tutorials on C# programming, ranging from basic operations to advanced coding techniques. His articles, often characterized by clarity and precision, serve as invaluable resources for both novice and experienced programmers. Beyond his technical expertise, Nathan is an advocate for continuous learning and enjoys exploring emerging technologies in AI and software development. When he’s not coding or writing, Nathan engages in mentoring upcoming developers, emphasizing the importance of both technical skills and creative problem-solving in the ever-evolving world of technology.
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