Command-Line Image Format Conversion

Originally published on: Sat, 26 Sep 2009 14:44:24 +0000

I needed a quick-and-dirty command-line image format conversion utility. The .NET framework made the task pretty painless. I wrote the following utility that can convert between Windows Bitmap, JPEG, GIF, PNG, and TIFF images. ( TIFF may have a variety of subformats, so your mileage may vary when trying to convert to/from TIFF. )

imgconv.cs

// imgconv.cs - Simple command-line image file converter
//
// License: MIT / X11
// Copyright (c) 2009 by James K. Lawless
// jimbo@radiks.net http://www.radiks.net/~jimbo
// http://www.mailsend-online.com
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

using System ;
using System.Drawing;
using System.Drawing.Imaging;

namespace ImgConv
{
   public class ImgConv
   {
        [STAThread]
public static void Main(string[] args)
      {
         ImageFormat fmt;
         string inputFile="",outputFile="";
         int i;
         fmt=ImageFormat.Jpeg;
         Console.WriteLine("\nimgconv by Jim Lawless - jimbo@radiks.net\n");

         for(i=0;i<args.Length;i++)
         {
            if(args[i].ToLower().Equals("-in"))
            {
               inputFile=args[i+1];
               i++;
            }
            else
            if(args[i].ToLower().Equals("-out"))
            {
               outputFile=args[i+1];
               i++;
            }
            else
            if(args[i].ToLower().Equals("-gif"))
            {
               fmt=ImageFormat.Gif;
            }
            else
            if(args[i].ToLower().Equals("-jpg"))
            {
               fmt=ImageFormat.Jpeg;
            }
            else
            if(args[i].ToLower().Equals("-png"))
            {
               fmt=ImageFormat.Png;
            }
            else
            if(args[i].ToLower().Equals("-bmp"))
            {
               fmt=ImageFormat.Bmp;
            }
            else
            if(args[i].ToLower().Equals("-tiff"))
            {
               fmt=ImageFormat.Tiff;
            }
            else
            {
               Console.WriteLine("Unknown option " + args[i]);
               Syntax();
               return;
            }
         }
         if( (inputFile=="")||(outputFile=="")) {
            Syntax();
            return;
         }
Bitmap b=new Bitmap(inputFile);
         b.Save(outputFile,fmt);
      }
      public static void Syntax()
      {
         Console.WriteLine("Syntax:\timgconv.exe -in input_file_name -out output_file_name [ -gif -png -tiff -jpg -bmp ]\n");
         Console.WriteLine("The default output format is -jpg.\n");
      }
   }
}

imgconv by Jim Lawless - jimbo@radiks.net

Syntax: imgconv.exe -in input_file_name -out output_file_name [ -gif -png -tiff -jpg -bmp ]

The default output format is -jpg.

To load a BMP file and save as a JPEG, issue the following command. ( The default output format is JPEG. You may optionally specify the -jpg parameter. )

imgconv -in file.bmp -out file.jpg

To load a JPEG file and save as a PNG, issue the following command.

imgconv -in file.jpg -out file.png -png

I haven't tested this with Mono, yet.

The source and executable file for imgconv can be downloaded in a single archive at: http://www.mailsend-online.com/wp/imgconv.zip

Unless otherwise noted, all code and text entries are Copyright Š2009 by James K. Lawless

Views expressed in this blog are those of the author and do not necessary reflect those of the author's employer. Views expressed in the comments are those of the responding individual.

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