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Crearting human readable image in C

Posted on 2004-08-26
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Last Modified: 2010-04-15
Dear All,

    I would like to develop a C program which should do the following things.

  1.  The given text should be displayed in human readable format ......

         For example: Whenever  we create user account in some server(like yahoo mail server) they will provide a human readable image.

  Let me know if anybody have idea how to do this.

Thanks & Regards,
Priyashree
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Question by:priyashree
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Expert Comment

by:Jaime Olivares
ID: 11902643
Have to be in pure C? Which Operating system? Images are highly system dependent if you want to make it in an easy way.
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Expert Comment

by:Jaime Olivares
ID: 11902661
By example, in Windows OS you can choose an ugly font (.TTF), paint over a bitmap and draw some random vertical lines on (like a bar code).
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Author Comment

by:priyashree
ID: 11902696
yes of course the program should be purely in C and the platform is linux......
is it possible
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Expert Comment

by:Jaime Olivares
ID: 11902850
Well, now you have to choose a graphics format and then a graphics library to generate it. How do you will present your bitmap, in a Web page, in a window, no need to display?
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Author Comment

by:priyashree
ID: 11903488
i going to display it in a webpage
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Expert Comment

by:Jaime Olivares
ID: 11904340
OK, I guess GIF format will be the best suited for your OS/Language.
Take a look to this uncompressed GIF library:
http://sourceforge.net/projects/libungif/
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Expert Comment

by:Jaime Olivares
ID: 11904396
Also you can use GD library, it is very popular in unix/web environment:
http://www.boutell.com/gd/
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Author Comment

by:priyashree
ID: 11911496
if you don't mind can u give me one sample program

thanks a lot
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Author Comment

by:priyashree
ID: 11940289
Dear jaime_olivers,

   I got one solution for the problem i have posted in this thread. Kindly walk through the code and give me your suggestions.

 Now i want to store the entire image in database in form of bytes....

  I am working with that..........

  Thanks for your support in this regard...........

  How to insert some filters to this image

  /* File : gd-eg1.c */
#include <gd.h>
#include <stdio.h>
#include <gdfontl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
char *generateRandomText(); //forward declaration
int main() {
      gdImagePtr im; //declaration of the image
      FILE *out; //output file
      int black,white;
        char *s = "Welcome";
       im = gdImageCreate(100,100); //create an image, 100 by 100 pixels
      black = gdImageColorAllocate(im, 0, 0, 0); //allocate black color
      white = gdImageColorAllocate(im, 255, 255, 255);      //allocate white color      
        gdImageString(im, gdFontLarge,      100 / 2 - (strlen(s) * gdFontLarge->w / 2),      100 / 2 - gdFontLarge->h / 2,      generateRandomText(), white);        
        out = fopen("test1.jpg", "w"); //open a file
            gdImageJpeg(im, out, -1); //write the image to thefile using the default quality setting
      /* be good, clean up stuff */
      fclose(out);
      gdImageDestroy(im);
}
char* generateRandomText() // To generate text in random order
   {
 
       unsigned int x,seed;
       char *k;
       int i,mix;
       int len;
       k = (char *) malloc (8 *sizeof(char));
       seed = (unsigned int) time(NULL);
       srand(seed);
       for( i = 0;   i < 8;i++ ) {
         mix= rand()%2;
         if (mix==0)
           k[i]= rand()%26 +'a';
         else
           k[i]= rand()%26 +'A';
       }
       printf("k is %s\n\n",k);
       len = strlen(k);
       printf("the length of s is %d \n\n" ,len);
       return k;
   }

Regards,
Priya.M



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Accepted Solution

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Jaime Olivares earned 60 total points
ID: 11940361
Hi, about your hidden text, you can do something like this:
http://www.micrologicaperu.com/imagenes/sample.html
by simply drawing lines of different colors.

To insert data into your database, that will depend on your specific database implementation.
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