• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 257
  • Last Modified:

Use ImageColorAt to map out pixel locations.

I need to know how to use ImageColorAt to map out pixels in a png image. Then echo the results like this,

Point 1 : X - 1, Y - 19
Point 2 : X - 4, Y - 36
Point 3 : X - 6, Y - 11

It will be a loop, I know that much. Thanks
0
JPERKS1985
Asked:
JPERKS1985
  • 3
  • 2
1 Solution
 
NickVdCommented:
This is completely untested, but it should produce a (very large, depending on image size) two dimensional array with each pixel's colour value, so pixel x-56, y-22 will have a colour of $rgbValues[56][22].
<?php
$img = ImageCreateFromPng("<YOURIMAGE>.png");
$imgWidth = imagesx($img);
$imgHeight = imagesy($img);

for($x=1 ; $x<=$imgWidth ; $x++) {
  for($y=1 ; $y<=$imgHeight ; $y++) {
    $rgbValues[$x][$y] = ImageColorAt($img, $x, $y);
  }
}
?>

Hope this helps!
0
 
JPERKS1985Author Commented:
didn't work :(. It should output it in x and y.
0
 
Cornelia YoderArtistCommented:
Building on NickVd's code, just add another loop to print it.

for($x=1 ; $x<=$imgWidth ; $x++) {
  for($y=1 ; $y<=$imgHeight ; $y++) {
    echo "X=$x  Y=$y  Color=" . ImageColorAt($img, $x, $y);
  }
}
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
NickVdCommented:
No no no... There isn't a need for two different loops... just echo the value in the main loop..

...
for($x=1 ; $x<=$imgWidth ; $x++) {
  for($y=1 ; $y<=$imgHeight ; $y++) {
    $rgb = ImageColorAt($img, $x, $y);
    $rgbValues[$x][$y] = $rgb; // for later use...
    echo "X=$x  Y=$y  Color=" . $rgb;
  }
}
0
 
JPERKS1985Author Commented:
didn't work/
0
 
JPERKS1985Author Commented:
"After separating all the characters, it time to get the individual pixel point (x, y) of each pixel (1px width x height) in a character and store them for later comparison. The function we will be using is the "ImageColorAt", which basically gets the index of the color of a pixel. Using a loop to go through every single pixel, you would be able to filter out the white pixels apart from the pixels that forms the character (Table 1.0). Do this for the rest of the different characters and you should have a completed pixel index library for this kind of  image. (Table 2.0) show the complete pixel index librar.."
0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now