Image sizes of GIF, PNG, and JPEG after compression ⋆ Tedds blog

When working with storage and network it is sometimes useful to know the estimated size of image. Should it be stored in SQL/NoSQL, locally, to CDN? Quite a few times have I tried to get a quick answer by Google, but its not that easy. So today I figured I’d write up a quick app, convert an image to some formats and post the results.

Image format and compression level impacts the size of an image.

The original image is a 16384×16384 332MB PNG image. I’m converting it to thumbnails of exponential starting at 8×8, 16×16, 32×32, .. up to 8192×8192. Once we hit 512 I keep thumbnails to this size so the table is readable. Once we hit 1024 I reuse the images from 1024 because there is little visible change. The image link is however linked to the resulting image.

Link to the result

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net.Mime;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using Microsoft.Win32;

namespace Tedd.ImageResizeSizeGenerator
{
    class ImageResizeTest
    {

        private string _htmlFile;

        public void Do()
        {
            var InputImageFile = "TestImage.png";
            var OutDir = "Converted";
            var Sizes = new List<Size>();
            Sizes.Clear();
            //const int startSize = 8, endSize = 16384;
            const int startSize = 8, endSize = 8192;
            int addSize = startSize;
            while (addSize <= endSize)
            {
                Sizes.Add(new Size(addSize, addSize));
                addSize *= 2;
            }
            //Sizes.Reverse();

            var jpegQualities = new List<int>() { 1, 30, 60, 90, 100 };

            if (!Directory.Exists(OutDir))
                Directory.CreateDirectory(OutDir);

            var log = new StringBuilder();
            var resultFile = Path.Combine(OutDir, "Result.txt");
            _htmlFile = Path.Combine(OutDir, "Result.html");
            var headerList = new List<string>() { "MegaPixels", "Width*Height", "Gif size", "PngSize" };
            headerList.AddRange(jpegQualities.Select((q) => "Jpeg " + q + " size"));

            File.WriteAllText(resultFile, string.Join(",", headerList) + Environment.NewLine);
            File.WriteAllText(_htmlFile, "<body><head><title>Image sizes</title></head><body>");
            File.AppendAllText(_htmlFile, "<table><tr><td>" + string.Join("</td><td>", headerList));
            File.AppendAllText(_htmlFile, "</td></tr>");


            foreach (var size in Sizes)
            {
                File.AppendAllText(_htmlFile, "<tr>");
                var data = new List<string>();

                var mp = (size.Width * size.Height) / 1024 / 1024;
                var filename = string.Format("{0}x{1}", (int)size.Width, (int)size.Height);
                filename = Path.Combine(OutDir, filename);

                data.Add(mp.ToString().Replace(",", "."));
                data.Add(((int)size.Width).ToString());
                data.Add(((int)size.Height).ToString());
                File.AppendAllText(_htmlFile, string.Format("<td>{0:00.00}</td><td>{1}x{2}</td>", mp, size.Width, size.Height));

                Debug.WriteLine(filename);

                var inputImage = new BitmapImage();
                inputImage.BeginInit();
                inputImage.UriSource = new Uri(InputImageFile, UriKind.Relative);
                inputImage.DecodePixelHeight = (int)size.Height;
                inputImage.DecodePixelWidth = (int)size.Width;
                inputImage.EndInit();

                { // GIF
                    var fn = filename + ".gif";
                    var fileSize = SaveImage(inputImage, fn, new GifBitmapEncoder(), size);
                    data.Add(fileSize.ToString());
                }
                { // PNG
                    var fn = filename + ".png";
                    var fileSize = SaveImage(inputImage, fn, new PngBitmapEncoder(), size);
                    data.Add(fileSize.ToString());
                }
                // JPEG
                foreach (var quality in jpegQualities)
                {
                    var fileSize = SaveImage(inputImage, filename + string.Format("_Q{0:000}", quality) + ".jpg",
                        new JpegBitmapEncoder() { QualityLevel = quality }, size);
                    data.Add(fileSize.ToString());
                }

                inputImage = null;

                GC.Collect(10);

                File.AppendAllText(resultFile, string.Join(",", data) + Environment.NewLine);
                File.AppendAllText(_htmlFile, "<td></td></tr>\r\n");
            }
            File.AppendAllText(_htmlFile, "</table></body></html>");



        }

        private object SaveImage(BitmapImage inputImage, string filename, BitmapEncoder encoder, Size size)
        {
            Debug.WriteLine(filename);
            encoder.Frames.Add(BitmapFrame.Create(inputImage));
            using (var filestream = new FileStream(filename, FileMode.Create))
                encoder.Save(filestream);

            var fileInfo = new FileInfo(filename);
            var sizeStr = "";
            // Above this size images become difficult to see
            if (size.Width > 128 || size.Height > 128)
                sizeStr = "width='128' height='128'";
            var file = Path.GetFileName(filename);
            // Thumbs from this size and up looks the same so no point in forcing in huge pictures
            if (size.Width > 1024)
                filename.Replace(size.Width.ToString(), "1024");
            File.AppendAllText(_htmlFile,
                string.Format("<td style='text-align: center; vertical-align: middle;'><a href='{0}' target='_blank'><img " + sizeStr + " src='{0}' /></a><br />{1}</td>", file, GetSizeReadable(fileInfo.Length)));
            return fileInfo.Length;
        }

        // Borowed from http://www.somacon.com/p576.php
        // Returns the human-readable file size for an arbitrary, 64-bit file size
        //  The default format is "0.### XB", e.g. "4.2 KB" or "1.434 GB"
        public static string GetSizeReadable(long i)
        {
            string sign = (i < 0 ? "-" : "");
            double readable = (i < 0 ? -i : i);
            string suffix;
            if (i >= 0x1000000000000000) // Exabyte
            {
                suffix = "EB";
                readable = (double)(i >> 50);
            }
            else if (i >= 0x4000000000000) // Petabyte
            {
                suffix = "PB";
                readable = (double)(i >> 40);
            }
            else if (i >= 0x10000000000) // Terabyte
            {
                suffix = "TB";
                readable = (double)(i >> 30);
            }
            else if (i >= 0x40000000) // Gigabyte
            {
                suffix = "GB";
                readable = (double)(i >> 20);
            }
            else if (i >= 0x100000) // Megabyte
            {
                suffix = "MB";
                readable = (double)(i >> 10);
            }
            else if (i >= 0x400) // Kilobyte
            {
                suffix = "KB";
                readable = (double)i;
            }
            else
            {
                return i.ToString(sign + "0 B"); // Byte
            }
            readable = readable / 1024;

            return sign + readable.ToString("0.### ") + suffix;
        }
    }
}

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Net.Mime;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using Microsoft.Win32;

namespace Tedd.ImageResizeSizeGenerator

{

class ImageResizeTest

{

private string _htmlFile;

public void Do()

{

var InputImageFile = "TestImage.png";

var OutDir = "Converted";

var Sizes = new List<Size>();

Sizes.Clear();

//const int startSize = 8, endSize = 16384;

const int startSize = 8, endSize = 8192;

int addSize = startSize;

while (addSize <= endSize)

{

Sizes.Add(new Size(addSize, addSize));

addSize *= 2;

}

//Sizes.Reverse();

var jpegQualities = new List<int>() { 1, 30, 60, 90, 100 };

if (!Directory.Exists(OutDir))

Directory.CreateDirectory(OutDir);

var log = new StringBuilder();

var resultFile = Path.Combine(OutDir, "Result.txt");

_htmlFile = Path.Combine(OutDir, "Result.html");

var headerList = new List<string>() { "MegaPixels", "Width*Height", "Gif size", "PngSize" };

headerList.AddRange(jpegQualities.Select((q) => "Jpeg " + q + " size"));

File.WriteAllText(resultFile, string.Join(",", headerList) + Environment.NewLine);

File.WriteAllText(_htmlFile, "<body><head><title>Image sizes</title></head><body>");

File.AppendAllText(_htmlFile, "<table><tr><td>" + string.Join("</td><td>", headerList));

File.AppendAllText(_htmlFile, "</td></tr>");

foreach (var size in Sizes)

{

File.AppendAllText(_htmlFile, "<tr>");

var data = new List<string>();

var mp = (size.Width * size.Height) / 1024 / 1024;

var filename = string.Format("{0}x{1}", (int)size.Width, (int)size.Height);

filename = Path.Combine(OutDir, filename);

data.Add(mp.ToString().Replace(",", "."));

data.Add(((int)size.Width).ToString());

data.Add(((int)size.Height).ToString());

File.AppendAllText(_htmlFile, string.Format("<td>{0:00.00}</td><td>{1}x{2}</td>", mp, size.Width, size.Height));

Debug.WriteLine(filename);

var inputImage = new BitmapImage();

inputImage.BeginInit();

inputImage.UriSource = new Uri(InputImageFile, UriKind.Relative);

inputImage.DecodePixelHeight = (int)size.Height;

inputImage.DecodePixelWidth = (int)size.Width;

inputImage.EndInit();

{ // GIF

var fn = filename + ".gif";

var fileSize = SaveImage(inputImage, fn, new GifBitmapEncoder(), size);

data.Add(fileSize.ToString());

}

{ // PNG

var fn = filename + ".png";

var fileSize = SaveImage(inputImage, fn, new PngBitmapEncoder(), size);

data.Add(fileSize.ToString());

}

// JPEG

foreach (var quality in jpegQualities)

{

var fileSize = SaveImage(inputImage, filename + string.Format("_Q{0:000}", quality) + ".jpg",

new JpegBitmapEncoder() { QualityLevel = quality }, size);

data.Add(fileSize.ToString());

}

inputImage = null;

GC.Collect(10);

File.AppendAllText(resultFile, string.Join(",", data) + Environment.NewLine);

File.AppendAllText(_htmlFile, "<td></td></tr>\r\n");

}

File.AppendAllText(_htmlFile, "</table></body></html>");

}

private object SaveImage(BitmapImage inputImage, string filename, BitmapEncoder encoder, Size size)

{

Debug.WriteLine(filename);

encoder.Frames.Add(BitmapFrame.Create(inputImage));

using (var filestream = new FileStream(filename, FileMode.Create))

encoder.Save(filestream);

var fileInfo = new FileInfo(filename);

var sizeStr = "";

// Above this size images become difficult to see

if (size.Width > 128 || size.Height > 128)

sizeStr = "width='128' height='128'";

var file = Path.GetFileName(filename);

// Thumbs from this size and up looks the same so no point in forcing in huge pictures

if (size.Width > 1024)

filename.Replace(size.Width.ToString(), "1024");

File.AppendAllText(_htmlFile,

string.Format("<td style='text-align: center; vertical-align: middle;'><a href='{0}' target='_blank'><img " + sizeStr + " src='{0}' /></a><br />{1}</td>", file, GetSizeReadable(fileInfo.Length)));

return fileInfo.Length;

}

// Borowed from http://www.somacon.com/p576.php

// Returns the human-readable file size for an arbitrary, 64-bit file size

// The default format is "0.### XB", e.g. "4.2 KB" or "1.434 GB"

public static string GetSizeReadable(long i)

{

string sign = (i < 0 ? "-" : "");

double readable = (i < 0 ? -i : i);

string suffix;

if (i >= 0x1000000000000000) // Exabyte

{

suffix = "EB";

readable = (double)(i >> 50);

}

else if (i >= 0x4000000000000) // Petabyte

{

suffix = "PB";

readable = (double)(i >> 40);

}

else if (i >= 0x10000000000) // Terabyte

{

suffix = "TB";

readable = (double)(i >> 30);

}

else if (i >= 0x40000000) // Gigabyte

{

suffix = "GB";

readable = (double)(i >> 20);

}

else if (i >= 0x100000) // Megabyte

{

suffix = "MB";

readable = (double)(i >> 10);

}

else if (i >= 0x400) // Kilobyte

{

suffix = "KB";

readable = (double)i;

}

else

{

return i.ToString(sign + "0 B"); // Byte

}

readable = readable / 1024;

return sign + readable.ToString("0.### ") + suffix;

}

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