//// 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.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos{    // This sample demonstrates how to use different grayscale effects.    // See also MatrixEffects1 and MatrixEffects2.    public class GrayscaleEffects    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            opaque = false;            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            using (var origBmp = new GcBitmap())            {                // Load a sample photo:                var imagePath = Path.Combine("Resources", "Images", "maple.jpg");                using (var stm = new FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                    origBmp.Load(stm);
                origBmp.SetAlphaTo255();                origBmp.Opaque = false;
                // Resize the original photo so we can place 4 samples of it                // on the resulting bitmap:                int w = pixelSize.Width / 2;                int h = pixelSize.Height / 2;                using (var sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic))                {                    // Copy the resized original into 4 quadrants of the resulting bitmap:                    bmp.BitBlt(sizedBmp, 0, 0);                    bmp.BitBlt(sizedBmp, w, 0);                    bmp.BitBlt(sizedBmp, 0, h);                    bmp.BitBlt(sizedBmp, w, h);                }
                // Moving the 3 lines with the "ApplyEffect" comment from below to here                // will apply the effects only to the photos but not to the texts.
                // Add borders between the quadrants, and captions for each:                var lineh = 2;                using (var g = bmp.CreateGraphics(null))                {                    var foreColor = Color.Yellow;                    var backColor = Color.Blue;                    var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));                    g.DrawLine(w, 0, w, h * 2, new GCDRAW.Pen(foreColor, lineh * 2));                    g.DrawLine(0, h, w * 2, h, new GCDRAW.Pen(foreColor, lineh * 2));                    var tf = new TextFormat() { Font = font, FontSize = 18, ForeColor = foreColor, BackColor = backColor, FontBold = true };                    g.DrawString(" Original image ", tf, new PointF(0, 0));                    g.DrawString(" GrayscaleStandard.BT601 ", tf, new PointF(w + lineh, 0));                    g.DrawString(" GrayscaleStandard.BT709 ", tf, new PointF(0, h + lineh));                    g.DrawString(" GrayscaleStandard.BT2100 ", tf, new PointF(w + lineh, h + lineh));                }                // ApplyEffect (move this code up to before drawing texts                // to limit it to photos only and not affect the captions).                //                // Keep the pixels in top left quadrant intact,                // apply effects to the other 3 quadrants:                bmp.ApplyEffect(GrayscaleEffect.Get(GrayscaleStandard.BT601), new Rectangle(w + lineh, 0, w - lineh, h - lineh));                bmp.ApplyEffect(GrayscaleEffect.Get(GrayscaleStandard.BT709), new Rectangle(0, h + lineh, w - lineh, h - lineh));                bmp.ApplyEffect(GrayscaleEffect.Get(GrayscaleStandard.BT2100), new Rectangle(w + lineh, h + lineh, w - lineh, h - lineh));            }            return bmp;        }    }}