C # watermark Transparency picture

Source: Internet
Author: User

/// <summary>        ///add a picture with a watermark effect at the specified position in a picture/// </summary>        /// <param name= "Sourceimage" >Specify the absolute path to the source picture</param>        /// <param name= "Watermarkimage" >Specify the absolute path to the watermark picture</param>        /// <param name= "SaveImage" >absolute path to save picture</param>         Public Static voidMakewatermark (stringSourceimage,stringWatermarkimage,stringsaveimage) {            //create an object to manipulate the source picture that needs to be watermarkedImage Imgphoto =Image.FromFile (sourceimage); //Gets the width and height of the source picture            intPhwidth =Imgphoto.width; intPhheight =Imgphoto.height; //create a blank image in BMP format (width and height consistent with the source picture)Bitmap Bmphoto =NewBitmap (Phwidth, Phheight, Pixelformat.format24bpprgb); //set the resolution of the new blank BMP picturebmphoto.setresolution (imgphoto.horizontalresolution, imgphoto.verticalresolution); //set the BMP picture as a drawing objectGraphics Grphoto =graphics.fromimage (Bmphoto); //set the quality of the generated pictureGrphoto.smoothingmode =Smoothingmode.antialias; //load the source picture into the new BMP picturegrphoto.drawimage (Imgphoto,//Photo Image Object                NewRectangle (0,0, Phwidth, Phheight),//Rectangle Structure                0,//X-coordinate of the portion of the source image to draw.                0,//Y-coordinate of the portion of the source image to draw.Phwidth,//Width of the portion of the source image to draw.Phheight,//Height of the portion of the source image to draw.GraphicsUnit.Pixel);//Units of Measure//Image object that creates a watermark pictureImage Imgwatermark =NewBitmap (watermarkimage); //get the width and height of a watermark picture            intWmwidth =Imgwatermark.width; intWmheight =Imgwatermark.height; //------------------------------------------------------------            //First step: Insert watermark Picture//------------------------------------------------------------            //Create a Bitmap based on the previously modified photograph BitmapBitmap Bmwatermark =NewBitmap (Bmphoto);            Bmwatermark.setresolution (Imgphoto.horizontalresolution, imgphoto.verticalresolution); //Load This Bitmap into a new Graphic ObjectGraphics Grwatermark =graphics.fromimage (Bmwatermark); //To achieve a transulcent watermark we'll apply (2) Color//manipulations by defineing a ImageAttributes object and//seting (2) of its properties.ImageAttributes ImageAttributes =NewImageAttributes (); //The first step in manipulating the watermark image was to replace//the background color with one which is trasparent (alpha=0, r=0, g=0, b=0)//To does this we'll use a Colormap and use this to define a remaptableColorMap ColorMap =NewColorMap (); //My watermark is defined with a background of 100% Green this would//Is the color we search for and replace with transparencyColormap.oldcolor = Color.FromArgb (255,0,255,0); Colormap.newcolor= Color.FromArgb (0,0,0,0); Colormap[] Remaptable={COLORMAP};            Imageattributes.setremaptable (remaptable, Coloradjusttype.bitmap); //The second color manipulation is used to change the opacity of the//Watermark. This is do by applying a 5x5 matrix that contains the//coordinates for the RGBA space. By setting the 3rd row and 3rd column//To 0.3f we achive a level of opacity            float[] colormatrixelements = {                                                 New float[] {1.0f,0.0f,0.0f,0.0f,0.0f},                                                       New float[] {0.0f,1.0f,0.0f,0.0f,0.0f},                                                        New float[] {0.0f,0.0f,1.0f,0.0f,0.0f},                                                        New float[] {0.0f,0.0f,0.0f,0.3f,0.0f},                                                        New float[] {0.0f,0.0f,0.0f,0.0f,1.0f}                                            }; ColorMatrix Wmcolormatrix=NewColorMatrix (colormatrixelements);            Imageattributes.setcolormatrix (Wmcolormatrix, Colormatrixflag.default, Coloradjusttype.bitmap); //For this example we 'll place the watermark in the upper right//hand corner of the photograph. Offset down, pixels and to the//Left ten pixles            intXPOSOFWM = ((phwidth-wmwidth)-Ten); intYPOSOFWM =Ten; Grwatermark.drawimage (Imgwatermark,NewRectangle (XPOSOFWM, YPOSOFWM, Wmwidth, Wmheight),//Set the detination Position                0,//X-coordinate of the portion of the source image to draw.                0,//Y-coordinate of the portion of the source image to draw.Wmwidth,//Watermark WidthWmheight,//Watermark HeightGraphicsUnit.Pixel,//Unit of MeasurmentImageAttributes);//ImageAttributes Object//Replace the original photgraphs bitmap with the new bitmapImgphoto.dispose (); Imgphoto=Bmwatermark;            Grphoto.dispose ();            Grwatermark.dispose ();            Bmphoto.dispose (); //------------------------------------------------------------            //Step Three: Save the picture//------------------------------------------------------------Imgphoto.save (SaveImage, imageformat.jpeg); //releasing resources in useImgphoto.dispose ();            Imgwatermark.dispose ();        Bmwatermark.dispose (); }

C # watermark Transparency picture

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.