//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using GrapeCity.Documents.Imaging;
namespace DsImagingWeb.Demos{    // This sample takes a color JPEG, converts it to different image types    // (such as b/w and grayscale) and creates a multi-frame TIFF from those    // images.    public class ImageTypesInTiff    {        public string DefaultMime { get => Common.Util.MimeTypes.TIFF; }
        public Stream GenerateImageStream(string targetMime, Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            if (targetMime != Common.Util.MimeTypes.TIFF)                throw new Exception("This sample only supports TIFF output format.");
            var path = Path.Combine("Resources", "Images", "minerva.jpg");
            var ms = new MemoryStream();            using (var tw = new GcTiffWriter(ms))            using (var bmp = new GcBitmap(path))            {                // Using the green channel produces a marginally better result for this photo.                // For a much better bi-level image produced by dithering, see DitheringInTiff.                using (var f = bmp.ToBilevelBitmap(ColorChannel.Green))                    tw.AppendFrame(f);                using (var f = bmp.ToGrayscaleBitmap())                    tw.AppendFrame(f);                // 4bpp allows from 8 to 16 colors, we use max (16):                using (var f = bmp.ToIndexed4bppBitmap(16))                    tw.AppendFrame(f);                // 8bpp allows from 8 to 256 colors, we use max (256):                using (var f = bmp.ToIndexed8bppBitmap(256))                    tw.AppendFrame(f);                tw.AppendFrame(bmp);            }            ms.Seek(0, SeekOrigin.Begin);            return ms;        }    }}