Dynamically changing color of photo?

[kernelgpf]

My problem is I'm getting an error saying my image is not a valid .png file the second time I tried to run the script.. I viewed the image, it still looks the same. I'm trying to replace the red in this image-

 

http://www.dragon-dynasty.com/waterdragon.png

 

with a hex code specified in this script. Help? Pre-thanks!

 

<?php
$v=$_SERVER['DOCUMENT_ROOT'];
function change_color($image, $old_color, $new_color, $threshold = 15)
{
    $image_width = imagesx($image);
    $image_height = imagesy($image);

    // iterate through x axis
    for ($x = 0; $x < $image_width; $x++) {

        // iterate through y axis
        for ($y = 0; $y < $image_height; $y++) {

            // look at current pixel
            $pixel_color = imagecolorat($image, $x, $y);

            if (($pixel_color <= $old_color + $threshold) && ($pixel_color >= $old_color - $threshold)) {
                // replace with new color
                imagesetpixel($image, $x, $y, $new_color);
            }
        }
    }
}

// EXAMPLE:

// convert all red in the image to green
$image = imagecreatefrompng("$v/waterdragon.png");
$red_rbg = 16646146;
$green_rbg = 65341;
change_color($image, $red_rbg, $green_rbg, 15);
imagejpeg($image,"$v/waterdragon.png");
?> 

[Wes1890]

Change

 

$image = imagecreatefrompng("$v/waterdragon.png");

 

to your exact path (take out the $v) to the image.. and see if you stil get the error

 

so put the image in the same directory as your script and just have this:

 

$image = imagecreatefrompng("waterdragon.png");

 

 

 

See if thats the prob

[kernelgpf]

Warning: imagecreatefrompng() [function.imagecreatefrompng]: 'waterdragon.png' is not a valid PNG file in /home/.leucorhinos/kernelgpf/dragon-dynasty.com/test.php on line 28

 

Warning: imagesx(): supplied argument is not a valid Image resource in /home/.leucorhinos/kernelgpf/dragon-dynasty.com/test.php on line 5

 

Warning: imagesy(): supplied argument is not a valid Image resource in /home/.leucorhinos/kernelgpf/dragon-dynasty.com/test.php on line 6

 

Warning: imagepng(): supplied argument is not a valid Image resource in /home/.leucorhinos/kernelgpf/dragon-dynasty.com/test.php on line 32

 

Dun think so. =/

[Wes1890]

Change

 

imagejpeg($image,"$v/waterdragon.png");

 

to

 

imagepng($image,"$v/waterdragon.png");

 

 

lol

[kernelgpf]

Same errors.

[Wes1890]

All i can figure is that it cant find the image... because im having trouble finding anymore errors

[kernelgpf]

Yeah.. I figured that. =/ How is it not a valid image? -Googles-

[Wes1890]

^ open it in photoshop of something and re-save it.. then try it

[kernelgpf]

Okay.. I fixed that error. But now NOTHING is showing up on the screen.. ?

 

You can see the results here:

 

dragon-dynasty.com/test.php

[Wes1890]

re-post your new code

[kernelgpf]

<?php
$v=$_SERVER['DOCUMENT_ROOT'];
function change_color($image, $old_color, $new_color, $threshold = 15)
{
    $image_width = imagesx($image);
    $image_height = imagesy($image);

    // iterate through x axis
    for ($x = 0; $x < $image_width; $x++) {

        // iterate through y axis
        for ($y = 0; $y < $image_height; $y++) {

            // look at current pixel
            $pixel_color = imagecolorat($image, $x, $y);

            if (($pixel_color <= $old_color + $threshold) && ($pixel_color >= $old_color - $threshold)) {
                // replace with new color
                imagesetpixel($image, $x, $y, $new_color);
            }
        }
    }
}

// EXAMPLE:

// convert all red in the image to green
$image = imagecreatefrompng("$v/waterdragon.png");

$red_rbg = 16646146;
$green_rbg = 65341;
change_color($image, $red_rbg, $green_rbg, 15);
imagepng($image,"$v/waterdragon.png");
?> 

[Wes1890]

[edit]

 

scratch this post

[Wes1890]

try

 

<?php
$v=$_SERVER['DOCUMENT_ROOT'];
function change_color($image, $old_color, $new_color, $threshold = 15)
{
    $image_width = imagesx($image);
    $image_height = imagesy($image);

    // iterate through x axis
    for ($x = 0; $x < $image_width; $x++) {

        // iterate through y axis
        for ($y = 0; $y < $image_height; $y++) {

            // look at current pixel
            $pixel_color = imagecolorat($image, $x, $y);

            if (($pixel_color <= $old_color + $threshold) && ($pixel_color >= $old_color - $threshold)) {
                // replace with new color
                imagesetpixel($image, $x, $y, $new_color);
            }
        }
    }

return $image;
}

// EXAMPLE:

// convert all red in the image to green
$image = imagecreatefrompng("$v/waterdragon.png");

$red_rbg = 16646146;
$green_rbg = 65341;
$image = change_color($image, $red_rbg, $green_rbg, 15);
imagepng($image,"$v/waterdragon.png");
?> 

 

 

 

 

lol.. im trying all i can think of.. just work with me

[kernelgpf]

Okay.. the first thing you posted.. the two things said exactly the same thing, and I tried the second thing, doesn't work.

 

Thanks for your help though. ^^

[Wes1890]

^ Yeah.. the first thing was accident.. its late lol

 

And the second thing.. bummer

 

 

Im out of ideas dude