Problems with the GD thumbnail generator
I am using PHP for sketching. The problem is that I have a set width and height to be thumbnails, and often times the images are stretched.
I would like the image to stay the same proportions and just have black fill (or any color) on the left or right for tall images, or top and bottom for wide images.
Here is the code I'm currently using: (got a little distorted to read)
$temp_image_file = imagecreatefromjpeg("http://www.example.com/image.jpg");
list($width,$height) = getimagesize("http://www.example.com/image.jpg");
$image_file = imagecreatetruecolor(166,103);
imagecopyresampled($image_file,$temp_image_file,0,0,0,0,166,103,$width,$height);
imagejpeg($image_file,"thumbnails/thumbnail.jpg",50);
imagedestroy($temp_image_file);
imagedestroy($image_file);
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5 answers
Ok, it works, here's what I did:
$filename = "http://www.example.com/image.jpg";
list($width,$height) = getimagesize($filename);
$width_ratio = 166 / $width;
if ($height * $width_ratio <= 103)
{
$adjusted_width = 166;
$adjusted_height = $height * $width_ratio;
}
else
{
$height_ratio = 103 / $height;
$adjusted_width = $width * $height_ratio;
$adjusted_height = 103;
}
$image_p = imagecreatetruecolor(166,103);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p,$image,ceil((166 - $adjusted_width) / 2),ceil((103 - $adjusted_height) / 2),0,0,ceil($adjusted_width),ceil($adjusted_height),$width,$height);
imagejpeg($image_p,"thumbnails/thumbnail.jpg",50);
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Here's a function I wrote that takes a GD image object, max width, max height and rescale inside these parameters:
function resized($im, $mx, $my) {
$x = $nx = imagesx($im);
$y = $ny = imagesy($im);
$ar = $x / $y;
while ($nx > $mx || $ny > $my) {
if ($nx > $mx) {
$nx = $mx;
$ny = $nx / $ar;
}
if ($ny > $my) {
$ny = $my;
$nx = $ny * $ar;
}
}
if ($nx != $x) {
$im2 = imagecreatetruecolor($nx, $ny);
imagecopyresampled($im2, $im, 0, 0, 0, 0, $nx, $ny, $x, $y);
return $im2;
} else {
return $im;
}
}
If the resulting image doesn't need to be scaled, it just returns the original image.
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This scales the image to a larger width and height and then crops it to the desired size.
// Crete an image forced to width and height
function createFixedImage($img, $id=0, $preFix=false, $mw='100', $mh='100', $quality=90){
// Fix path
$filename = '../'.$img;
// Check for file
if(file_exists($filename))
{
// Set a maximum height and width
$width = $mw;
$height = $mh;
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height < $ratio_orig) {
$width = $height*$ratio_orig;
}else{
$height = $width/$ratio_orig;
}
// Resample
$image_p = imagecreatetruecolor($mw, $mh);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
// Output
imagejpeg($image_p, "../images/stories/catalog/{$preFix}{$id}.jpg", $quality);
}
}
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