//// 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 GrayscaleBitmap.AutoContrast()    // to automatically adjust the contrast of a black and white image.    public class AutoContrast    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            opaque = true;            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", "ImagesBis", "tremblant.png");                GrayscaleBitmap grayBmp;                using (var stm = new FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                {                    origBmp.Load(stm);                    origBmp.Opaque = opaque;                    grayBmp = origBmp.ToGrayscaleBitmap();                }
                // Resize the original photo to fit two versions on the resulting bitmap:                int w = pixelSize.Width;                int h = pixelSize.Height / 2;                using (var sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic))                {                    // Copy the resized original into the upper half of the resulting bitmap:                    bmp.BitBlt(sizedBmp, 0, 0);                    // Auto adjust the contrast of the original image and copy the result into the lower half:                    grayBmp.AutoContrast();                    using (var tbmp = grayBmp.ToGcBitmap())                        bmp.BitBlt(tbmp, 0, h);                }
                // Add captions (original and adjusted images):                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(0, h, w * 2, h, new GCDRAW.Pen(Color.Gray, lineh * 2));                    var tf = new TextFormat() { Font = font, FontSize = 18, ForeColor = foreColor, BackColor = backColor, FontBold = true };                    var th = g.MeasureString("QWERTY", tf).Height;                    g.DrawString(" Original image ", tf, new PointF(0, h - th + lineh));                    g.DrawString(" Auto contrast applied ", tf, new PointF(0, h * 2 + lineh - th + lineh));                }            }            return bmp;        }    }}