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Merge 2 Images with transparency

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User-1103495211 posted

I've got 2 images.
1 image with size (205x187) and 1 image with a different size, but this one is smaller then the first one.

I try to merge this images. The first 1 is a PNG 32, but i think ASP saw it as 8 bits?
But if i run my script i get:

My Script is:

public void mergePNG(typePNG type)
        {
            System.Drawing.Graphics myGraphic = null;

            string png= null;
            if (type == typePNG.Actie)
            {
                png = ConfigurationManager.AppSettings["localPath"] + "images\actie.png";
            }

            System.Drawing.Image imgB;
            imgB = byteArrayToImage(this.Image);
            System.Drawing.Image imgF;
            imgF = System.Drawing.Image.FromFile(@"C:\websites\HV tweewielers\images\actie.png");//png);
            System.Drawing.Image m;
            m = imgB;

            myGraphic = System.Drawing.Graphics.FromImage(m);
            //myGraphic.DpiX = 205;
            //myGraphic.DpiY = 187;
            myGraphic.DrawImageUnscaled(imgF, 0, 0);
            myGraphic.DrawImageUnscaled(imgB, 0, 0);
            myGraphic.DrawImageUnscaled(imgB, 0, 0);

            myGraphic.Save();

            this.Image = ConvertImageToByteArray(m, System.Drawing.Imaging.ImageFormat.Jpeg);
        }

So i thought mabye if i change this:  m = imgB; in m = imgF; then i should at least get an bigger image... , thats true, but the other image is very small:

Quite strange, but i take a look at the 2 images, 1 of them is in code:

imgB (HorizontalResolution = 182, verticalResulition = 182)
imgF (HorizontalResolution = 71.111, verticalresolution, 71.1111)

But i cant change resolutions ore something, i think there is a better way to do this.
also if i right klick on the image and save as, then i get the imgB image! on both images! quite strange... [:|]

Friday, August 8, 2008 9:20 AM

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User-1103495211 posted

I searched for some Alpha Transperenacy on the internet, and found some code wich should do it.
Right below the working version

string png = null;
            if (type == typePNG.Actie)
            {
                png = ConfigurationManager.AppSettings["localPath"] + @"images\actie.png";
            }          
            System.Drawing.Image fImg = System.Drawing.Image.FromFile(png);


            System.Drawing.Image img = new Bitmap(205, 187);
            Graphics g = Graphics.FromImage(img);
            g.DrawImage(bImg, 12, 35, bImg.Width, bImg.Height);
            ImageAttributes imgattr = new ImageAttributes();
            ColorMatrix colormatrix = new ColorMatrix();
            colormatrix.Matrix00 = 1.0F;
            colormatrix.Matrix11 = 1.0F;
            colormatrix.Matrix22 = 1.0F;
            colormatrix.Matrix33 = (float)1.0F; //Opancy, 0.5F is 50%
            colormatrix.Matrix44 = 1.0F;
            imgattr.SetColorMatrix(colormatrix);
            Rectangle destRect = new Rectangle(0, 0, fImg.Width, fImg.Height);             
            g.DrawImage(fImg,
                    destRect,
                    0,
                    0,
                    fImg.Width,
                    fImg.Height,
                    System.Drawing.GraphicsUnit.Pixel,
                    imgattr);
            //Add text:
            System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(System.Drawing.Color.White);
            g.DrawString("HV Motor sport", new Font("Verdana",17),brush, new Point(90, 136));
            g.Save();

string png = null;
            if (type == typePNG.Actie)
            {
                png = ConfigurationManager.AppSettings["localPath"] + @"images\actie.png";
            }
            System.Drawing.Image fImg = System.Drawing.Image.FromFile(png);

            System.Drawing.Image img = new Bitmap(205, 187);
            Graphics g = Graphics.FromImage(img);
            g.DrawImage(bImg, 12, 35, bImg.Width, bImg.Height);
            ImageAttributes imgattr = new ImageAttributes();
            ColorMatrix colormatrix = new ColorMatrix();
            colormatrix.Matrix00 = 1.0F;
            colormatrix.Matrix11 = 1.0F;
            colormatrix.Matrix22 = 1.0F;
            colormatrix.Matrix33 = (float)1.0F; //Opancy, 0.5F is 50%
            colormatrix.Matrix44 = 1.0F;
            imgattr.SetColorMatrix(colormatrix);
            Rectangle destRect = new Rectangle(0, 0, fImg.Width, fImg.Height);
            g.DrawImage(fImg,
                    destRect,
                    0,
                    0,
                    fImg.Width,
                    fImg.Height,
                    System.Drawing.GraphicsUnit.Pixel,
                    imgattr);
            //Add text:
            System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(System.Drawing.Color.White);
            g.DrawString("text", new Font("Verdana",17),brush, new Point(90, 136));
            g.Save();

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Saturday, August 9, 2008 8:39 AM

Answered by:

Merge 2 Images with transparency

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