3-Heights™ PDF Optimizer - compress your PDF and reduce the file size

In this sample, we use the pre-defined "web" optimization profile, which configures the optimizer optimally for this purpose. In order to reduce the file size even more, we adjust the color threshold DPI and color resolution DPI such that all color images with a resolution higher than 150 DPI are downsampled to 96 DPI.

In general:

1. Configure the PDF Optimizer using the pre-defined "web" optimization profile (see manual for detailed description).
2. Adjust specific settings that you want to configure different to the profile.

In the manual you can find a detailed description of all the settings and optimization profiles.

using System;
using Pdftools.Pdf;
using Pdftools.PdfOptimize;

namespace PdfOptimizerSamples
{
    class OptimizeForWebSample
    {
        /// <summary>
        /// Optimizes a given PDF document for the web and saves the result to a new file
        /// </summary>
        /// <param name="inFilePath">Path to input PDF document</param>
        /// <param name="outFilePath">Path to resulting PDF document</param>
        public static void OptimizeForWeb(string inFilePath, string outFilePath)
        {
            // 1. Create new PDF optimizer
            using (Optimizer opt = new Optimizer())
            {
                // 2. Open input document
                if (!opt.Open(inFilePath, String.Empty))
                {
                    Console.WriteLine("Unable to open input file (" + opt.ErrorCode + ")");
                    return;
                }

                // 3. Configure the optimizer for web viewing

                // Using the web profile configures the optimizer with the optimal settings for web viewing
                opt.Profile = PDFOptimizationProfile.eOptimizationProfileWeb;

                // Adjust individual values. 
                // The web profile e.g. compresses all color images with a resolution higher than 210 DPI to 150 DPI.
                // For a higher compression, this example overrides the profile settings as follows:
                opt.ColorThresholdDPI = 150;
                opt.ColorResolutionDPI = 96;

                // 4. Optimize document according to optimizer settings and save as new document
                if (!opt.SaveAs(outFilePath, String.Empty, String.Empty, PDFPermission.ePermNoEncryption))
                {
                    Console.WriteLine("Error while optimizing (" + opt.ErrorCode + ")");
                    return;
                }

                // 5. Close the currently open input files
                opt.Close();
            }
        }
    }
}

pdfoptimize -pr web -dct 150 -dcr 96 in.pdf out.pdf
# -pr web: use web optimization profile as a starting point
# -dct 150: set threshold for color images to 150 DPI
# -dcr 96: color images higher than the above threshold will be resampled to 96 DPI