//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using GrapeCity.Documents.Drawing;using GrapeCity.Documents.Imaging;
namespace DsImagingWeb.Demos{    // This sample demonstrates how to find and show pixels with clipped shadows.    // This sample is identical to ShowLoClippingTiff but uses a JPEG image    // rather than a TIFF created from the same source photo.    public class ShowLoClippingJpeg    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            using (var bmpSrc = new GcBitmap(Path.Combine("Resources", "ImagesBis", "clivia.jpg")))            {                // BitBlt requires the opacity of both images to be the same:                bmpSrc.Opaque = opaque;                // Render source image onto the target bitmap                // (generally we might want to resize the source image first,                // but in this case we just know that the source image has                // the same size as the target, so skip this step):                bmp.BitBlt(bmpSrc, 0, 0);
                using (var g = bmp.CreateGraphics())                {                    for (int i = 0; i < bmp.PixelWidth; ++i)                        for (int j = 0; j < bmp.PixelHeight; ++j)                        {                            // If all of the colors are 0x00, we change the pixel's color to magenta:                            if ((bmp[i, j] & 0x00FFFFFF) == 0)                                bmp[i, j] = 0xFFFF00FF;                        }                    // Draw the original image in the bottom right corner for reference:                    var rc = new RectangleF(0, 0, pixelSize.Width / 4, pixelSize.Height / 4);                    g.DrawImage(bmpSrc, rc, null, ImageAlign.StretchImage);                    g.DrawRectangle(rc, Color.LightGray);                }            }            return bmp;        }    }}