PHP GD query

Farmer · 03-13-2009, 04:04 AM

I am trying to get the index color of a image but still no luck. I have 2 files.

-- image.php [GD generated image]
-- view.php [File to view the index color of image.php]

image.php

Code:

header("Content-Type: image/jpeg");

$img = imagecreate("200", "150");
$bgcolor = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$text = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

imagejpeg($img);
imagedestroy($img)

view.php

Code:

$im = imagecreatefromjpeg('image.php');

// get a color
$start_x = 20;
$start_y = 20;
$color_index = imagecolorat($im, $start_x, $start_y);

// make it human readable
$color_tran = imagecolorsforindex($im, $color_index);

print_r($color_tran);

when i try other normal jpeg file it return values but when i try image.php file it'll not to return the value. Can you help me here.

Sakakuchi · 03-14-2009, 10:24 AM

Now thats just an assumption. But as far as I know imagecreatefromjpeg can only retrieve files with an .jpg and .jpeg ending. Thats why theres also a imagecreatefromJPEG -> for .JPG and .JPEG files.
Now, I might lie - but I think thats where you error occurs. I guess you can't fetch "jpg's" where the image is actually created by PHP/ -> or has an .php ending. But as I said - not sure whether I talk some bullshit here, just an theory...

ioan1k · 03-15-2009, 01:32 AM

This will not work as the GD library does not run the PHP script and only tries to load the JPEG image.

An alternative to this could be the following

PHP Code:


			
// image.php
$img = imagecreate("200", "150");
$bgcolor = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$text = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

// Save image 
imagejpeg($img, 'testimage.jpeg');
imagedestroy($img);

// redirect to view
header('location: view.php');

PHP Code:


			
// view.php
// Redirect if there is no image
if (!file_exists('testimage.jpeg'))
{
    require('image.php');
}

// Load Image
$im = imagecreatefromjpeg('testimage.jpeg');

// Delete image
@unlink('testimage.jpeg');
// get a color
$start_x = 20;
$start_y = 20;
$color_index = imagecolorat($im, $start_x, $start_y);

// make it human readable
$color_tran = imagecolorsforindex($im, $color_index);

print_r($color_tran);

Tested and works