Click here to Skip to main content
11,492,523 members (60,786 online)
Click here to Skip to main content

ASCII art with C#

, 31 Jan 2005 353.2K 7K 178
Rate this:
Please Sign up or sign in to vote.
About writing an image to ASCII converter.

Sample Image - ascii_art_with_c_.jpg

Introduction

Behind the scenes: I like C# and I like ASCII art. So I asked myself if somebody has written some image to ASCII application in C#. I Googled but found nothing. I did image manipulation stuff for my company and so I decided to build a basic image-to-ASCII conversion library in C#.

You can see a running sample here.

Step 1: The Upload Form.

To keep it quite simple, I just check the content type and let my library do the rest.

if(File1.PostedFile.ContentType=="image/gif" ||
    File1.PostedFile.ContentType=="image/jpg" ||
    File1.PostedFile.ContentType=="image/jpeg" ||
    File1.PostedFile.ContentType=="image/pjpeg" ||
    File1.PostedFile.ContentType=="image/bmp")
   {
        Output.Text = "<xmp>" +
        StaticDust.AsciiArt.ConvertImage(
         File1.PostedFile.InputStream) +
        "</xmp>";
   }
   else
   {
        ...

Step 2: The Library

The first thing I do is of course load the image:

Image _img = Image.FromStream(stream);
Bitmap _image = 
 new Bitmap(_img, new Size(_img.Width, _img.Height));
_img.Dispose();

Next I grayscale the image - you'll see later why.

Rectangle bounds = 
 new Rectangle(0, 0, _image.Width, _image.Height);

ColorMatrix _matrix = new ColorMatrix();
_matrix[0,0] = 1/3f;
_matrix[0,1] = 1/3f;
_matrix[0,2] = 1/3f;
_matrix[1,0] = 1/3f;
_matrix[1,1] = 1/3f;
_matrix[1,2] = 1/3f;
_matrix[2,0] = 1/3f;
_matrix[2,1] = 1/3f;
_matrix[2,2] = 1/3f;

ImageAttributes _attributes = 
 new ImageAttributes();
_attributes.SetColorMatrix(_matrix);

Graphics gphGrey = Graphics.FromImage(_image);
gphGrey.DrawImage(_image, 
 bounds, 
 0, 
 0, 
 _image.Width, 
 _image.Height,
 GraphicsUnit.Pixel, 
 _attributes);

gphGrey.Dispose();

O.K. Now, we get to the interesting part.

for(int h=0; h<_image.Height/10; h++)
{
    int _startY = (h*10);

    for(int w=0; w<_image.Width/5; w++)
    {
         int _startX = (w*5);
         int _allBrightness = 0;
         ...

I loop through the image's pixels and because I don't want one ASCII character per pixel, I take one per 10/5. To let every pixel influence the resulting ASCII char, I loop them and calculate the brightness of the amount.

for(int y=0; y<10; y++)
{
    for(int x=0; x<10; x++)
    {
        int _cY = y + _startY;
        int _cX = x + _startX;
        try
        {
            Color _c = _image.GetPixel(_cX, _cY);
            int _b = (int)(_c.GetBrightness() * 10);
            _allBrightness = (_allBrightness + _b);
        }
        catch
        {
            _allBrightness = (_allBrightness + 10);
        }
        ...

Finally, I append different ASCII characters based on the calculated amount:

int _sb = (_allBrightness/10);
if(_sb<25)
{
    _asciiart.Append("#");
}
else if(_sb<30)
{
    ...

That's all

Thanks to The Code Project and Chris Maunder, newtelligence and greetings to all C# coders out there.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

Share

About the Author


Comments and Discussions

 
Questionhow to install it? Pin
Mr.Prakash27-Dec-04 22:48
memberMr.Prakash27-Dec-04 22:48 
AnswerRe: how to install it? Pin
Daniel Fisher (lennybacon)28-Dec-04 1:37
memberDaniel Fisher (lennybacon)28-Dec-04 1:37 
GeneralWhy not include the project file? Pin
Steven Fowler28-Dec-04 4:36
memberSteven Fowler28-Dec-04 4:36 
GeneralRe: Why not include the project file? Pin
Daniel Fisher (lennybacon)28-Dec-04 15:49
memberDaniel Fisher (lennybacon)28-Dec-04 15:49 
GeneralRe: Why not include the project file? Pin
Steven Fowler29-Dec-04 6:40
sussSteven Fowler29-Dec-04 6:40 
GeneralRe: Why not include the project file? Pin
Daniel Fisher (lennybacon)29-Dec-04 7:35
memberDaniel Fisher (lennybacon)29-Dec-04 7:35 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.150520.1 | Last Updated 31 Jan 2005
Article Copyright 2004 by Daniel Fisher (lennybacon)
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid