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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Graphics
mtdiff image differencer (useful for animate gifs etc...)
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technosaurus


Joined: 18 May 2008
Posts: 3845
PostPosted: Tue 09 Oct 2012, 04:54    Post subject:  mtdiff image differencer (useful for animate gifs etc...)  
This is a modification of Mark Tyler's micmp.c example program from the most recent mtcelledit package.

I recalled looking for something like this once and all I found was other people looking, so just in case I need it later, here is mtdiff

Basically all it does is take 2 images of the same size and outputs an image ("diff.png") that shows only the differences (all other pixels get the first color of image 1 which is typically a transparency color) ... nice for reducing the size of animations (this is how webp animations work iirc)

sorry, it only does a static file name, so you'll have to write some kind of script for renaming if you wish to batch process a large number of files.

Code:
/*   micmp.c
   Copyright (C) 2007-2008 Mark Tyler

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program in the file COPYING.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mtpixel.h>

static void compare_images( mtImage *ia, mtImage *ib ){
   mtImage *ic=ia;
   int      i, j, k, rgb[3][3] = { {0,0,0}, {0,0,0}, {0,0,0} };
   unsigned char   *a, *b, *c;
   a = ia->channel[MTPIXEL_CHANNEL_IMAGE];
   b = ib->channel[MTPIXEL_CHANNEL_IMAGE];
   c = ic->channel[MTPIXEL_CHANNEL_IMAGE];

   if ( ia->width == ib->width && ia->height == ib->height && ia->type == ib->type ){
      j = ia->width * ia->height;
      if ( ia->type == MTPIXEL_IMAGE_INDEXED ){
         for ( i=0; i<j; i++ ){
            if ( a[0] != b[0] ) c[0]=b[0];
            else c[0]=0;
            rgb[0][0] = abs( a[0] - b[0] );
            if ( rgb[0][0] > rgb[0][1] ) rgb[0][1] = rgb[0][0];
            rgb[0][2] += rgb[0][0];
            a ++; b ++; c ++;
         }
      }

      if ( ia->type == MTPIXEL_IMAGE_RGB ){
         for ( i=0; i<j; i++ ){
            for ( k=0; k<3; k++ ){
               rgb[k][0] = abs( a[k] - b[k] );
               if ( rgb[k][0] > rgb[k][1] ) rgb[k][1] = rgb[k][0];
               rgb[k][2] += rgb[k][0];
            }
            if ( a[0] == b[0] && a[1] == b[1] && a[2] == b[2] )
               {c[0]=0;c[1]=0;c[2]=0;}
            else
               {c[0]=b[0];c[1]=b[1];c[2]=b[2];}
            a += 3; b += 3; c += 3;
         }
      }
      ic->palette.trans=0;
      mtpixel_image_save( ic, "diff.png", MTPIXEL_FILE_TYPE_PNG, 5 );
   }
}

int main( int argc, char *argv[] ){
   mtImage   *ia, *ib;
   int   res = 0;

mtpixel_init();
if ( argc != 3 ){
   res = 2;
}else{
   ia = mtpixel_image_load( argv[1] );
   if ( !ia ){
      res = 1;
   }else{
      ib = mtpixel_image_load( argv[2] );
      if ( !ib ){
         res = 1;
      }else{
         compare_images( ia, ib );
         mtpixel_image_destroy( ib );
      }
      mtpixel_image_destroy( ia );
   }
}
mtpixel_quit();
return res;
}
mtdiff.tar.gz
Description 
gz

 Download 
Filename  mtdiff.tar.gz 
Filesize  11.83 KB 
Downloaded  216 Time(s) 

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Last edited by technosaurus on Tue 09 Oct 2012, 06:27; edited 3 times in total
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technosaurus


Joined: 18 May 2008
Posts: 3845
PostPosted: Tue 09 Oct 2012, 05:00    Post subject:  
here is an example:
two images that were compared on the left and their diff.png on the right

Edit: if you are 1 of the 2 who already downloaded this, I have transparency working now.
mtdiff.tar.gz
Description  saves as diff.gif (the initial post saves as a png)
 gz

 Download 
Filename  mtdiff.tar.gz 
Filesize  11.83 KB 
Downloaded  215 Time(s) 
example2.png
 Description   
 Filesize   4.04 KB
 Viewed   263 Time(s)

example2.png
example.png
 Description   
 Filesize   35.74 KB
 Viewed   275 Time(s)

example.png

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