Solved

Image Log

Posted on 2014-03-22
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Last Modified: 2014-03-30
I am trying to produce a log of all the pixels of an image file. I would like to print out the value of each pixel, one per line. I would like the R,G, and B values shown on a scale of 0-255. I have a snippet that almost does this, but returns the RGB values in a format that I am not sure how to convert to the one I need.

For example, the log should look like

0 255 255
255 0 0
etc.

This snippet produces a log file that looks like:

1542,1799,2313,0
1542,1799,2313,0
1542,1799,2313,0

The fact that the output is all the same, and I know the image is not all one color, also has me thinking that it is not moving from pixel to pixel, but just reporting one pixel for each pixel in the image.

Any ideas on how to get a log file with the data that is needed?


#!/usr/bin/perl

use Image::Magick;
my($image, $x);

$image = Image::Magick->new;
$x = $image->Read('file.jpg');
warn "$x" if "$x";

$cols=$image->get('columns');
$rows=$image->get('rows');

for($row=1; $row<=$rows; $row++){
      for($i=1; $i<=$cols; $i++){
            print $image->get("pixel") . "\n ";
      }
}

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Comment
Question by:stakor
  • 4
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6 Comments
 
LVL 15

Accepted Solution

by:
WalkaboutTigger earned 500 total points
ID: 39948327
Did you look at and try the code found at

http://www.perlmonks.org/?node_id=60662

Am thinking you are using get(pixel) incorrectly.
0
 

Author Comment

by:stakor
ID: 39948333
Replacing:
print $image->get("pixel") . "\n ";

With:
print $image->get("$r $g $b") . "\n ";

prints about the right number of lines, but they are all blank.
0
 
LVL 15

Expert Comment

by:WalkaboutTigger
ID: 39948338
Do you also have


my ($r,$g,$b) = $myImage->rgb($index);?
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Author Comment

by:stakor
ID: 39948435
Ok, switching gears slightly:

#!/usr/bin/perl

use Image::Magick;

my $input = new Image::Magick;
$input->Read ('file.jpg');
($h,$w)=$input->get('height','width');
for $x (0..$h-1){
    for $y (0..$w-1){
      ($r,$g,$b) = split/,/, $input->get("pixel($x,$y)");
       print "$r $g $b \n";
   }
}

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This does the printing that I am looking for, but not in the format I am looking for. It is returning values like "1542", and not 0-255. Any ideas on how to get the format changed?
0
 

Author Comment

by:stakor
ID: 39948436
Also, as it turns out, it is reporting the same value for every pixel. The image is not all the same color. hmm.
0
 

Author Comment

by:stakor
ID: 39952774
Sorry, wrong topic.
0

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