Creating Dynamic Image Thumbnail
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Fri. Aug. 25th, 2006 3:55 AM
Before any wars start, I want to clarify that the code below is NOT my own code, but unfortunately I am uncertain where I obtained it from. The code below basically create dynamic thumbnails of an image, you parse the following to it:
Image location,
Maximum Width
Maximum Height
It will then scale your image down, please do not confuse this with converting your image into a square, or whatever shape you are after. The code below will maintain aspect ratio of your image, and will use the values you parse as a guidline. Extremely handy when you are building gallery websites.
Image location,
Maximum Width
Maximum Height
It will then scale your image down, please do not confuse this with converting your image into a square, or whatever shape you are after. The code below will maintain aspect ratio of your image, and will use the values you parse as a guidline. Extremely handy when you are building gallery websites.
<?php
# Get image location
$image_path=$_GET['img'];
# Load image
$img = null;
$ext = strtolower(end(explode('.', $image_path)));
if ($ext == 'jpg' || $ext == 'jpeg') {
$img = @imagecreatefromjpeg($image_path);
} else if ($ext == 'png') {
$img = @imagecreatefrompng($image_path);
# Only if your version of GD includes GIF support
} else if ($ext == 'gif') {
$img = @imagecreatefromgif($image_path);
}
# If an image was successfully loaded, test the image for size
if ($img) {
# Get image size and scale ratio
$width = imagesx($img);
$height = imagesy($img);
$scale = min($_GET['width']/$width, $_GET['height']/$height);
# If the image is larger than the max shrink it
if ($scale < 1) {
$new_width = floor($scale*$width);
$new_height = floor($scale*$height);
# Create a new temporary image
$tmp_img = imagecreatetruecolor($new_width, $new_height);
# Copy and resize old image into new image
imagecopyresized($tmp_img, $img, 0, 0, 0, 0,
$new_width, $new_height, $width, $height);
imagedestroy($img);
$img = $tmp_img;
}
}
# Create error image if necessary
if (!$img) {
$img = imagecreate($_GET['width'], $_GET['height']);
imagecolorallocate($img,0,0,0);
$c2 = imagecolorallocate($img,70,70,70);
imageline($img,0,0,$_GET['width'],$_GET['height'],$c2);
imageline($img,$_GET['width'],0,0,$_GET['height'],$c2);
}
# Display the image
header("Content-type: image/jpeg");
imagejpeg($img);
?>
Justin Nel
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