将全景图像调整为固定大小

Question

I want to resize the images to fixed width and height (i.e. 150px). However, theres a problem, if there is lots of difference in height and width of original photo (for example, panoramic photo), the resized thumbnail looks bad. Is there any any smart solution to resize the photos to a fixed width and height? For example, please have a look at this image:

Here's my code:

<?php
    $params = getimagesize($tempFile);
    $width = $params[0];
    $height = $params[1];

    $newwidth=150;
    $newheight= 150;
    $tmp=imagecreatetruecolor($newwidth,$newheight);

    imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
    imagejpeg($tmp,$img_name,80);

    imagedestroy($src);
    imagedestroy($tmp); 
?>

Is there any smart way to resize the images in smart way? Thanks.

Answer 1

There's a smart solution, it's called Seam Carving, and if your server supports ImageMagick, you do it like this:

<?php
$im = new Imagick( 'image.jpg' );
$im->liquidRescaleImage( 600, 100, 3, 25 );
header( 'Content-Type: image/jpg' );
echo $im;
?>

Or alternatively, if it doesn't support, use exec() (carefully) in order to pass image as an argument to executable which can perform seam carving.

BTW it looks like twitpic just crop's the squared image extract. In one of my previous projects I used following code:

if ($image->width > $image->height){
    //crop image in proportions 4/3, then resize to 500x300 (or proportionally lower resolution), 
    //sharp it a little and decrease quality. 
    //I used one of the Yii framework extensions.
    $image->crop($image->width, $image->width/4*3)->resize(500, 300, Image::WIDTH)->sharpen(15)->quality(75);
}