[SOLVED] resize a thumbnail from a panorama

[brooksh]

I want a thumbnail that is 100 wide by 75 high. My original image is 3000x400. So if I just change the width to 100, I have a thumbnail 100x10. If I change both the width and height to 100x75 then I get a messed up skewed image. Is it possible to set the height to 75, then cut off the rest of the width to 100? Here is what I have, but it doesn't work.

 

$oldimagesize = getimagesize($uploadFile);
$width = 100;
$height = 75;

$thumbsize = 75;
$width_orig = $oldimagesize[0];
$height_orig = $oldimagesize[1];

$ratio_orig = $width_orig/$height_orig;

if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
} else {
   $height = $width/$ratio_orig;
}
	$thumbimagename = 'thumb_' . $newimagename;
	$thumbimagefull = $uploadDir . $thumbimagename;
	$thumbimage = imagecreatetruecolor($thumbsize, $thumbsize);
imagecopyresampled($thumbimage, $oldimage, -($width/2) + ($thumbsize/2), -($height/2) + ($thumbsize/2), 0, 0, $width, $height, $width_orig, $height_orig);
imagejpeg($thumbimage, null, 100);

[taquitosensei]

this should work  where $x and $y are the originals and obviously $newx and $newy is the new dimensions.  This resizes without losing the image ratio.

$ratio1 = $x/$newX;
    $ratio2 = $y/$newY;
    if($ratio1 > $ratio2)
    {
        $nx = $newX;
        $ny = $y / $ratio1;
    } else
    {
        $nx = $x / $ratio2;
        $ny = $newY;
    }

[brooksh]

I almost have it, but it is still skewed.

Something like this

to become this

$oldimagesize = getimagesize($uploadFile);
	$new_width = 100;
	$new_height = "75";
	$old_width = $oldimagesize[0];
	$old_height = $oldimagesize[1];


if($old_width > $old_height){  

    $biggestSide = $old_height;   
    $cropPercent = .5;   
    $cropWidth   = $old_width*$cropPercent;   
    $cropHeight  = $biggestSide*$cropPercent;   
    $c1 = array("x"=>($old_width-$cropWidth)/2, "y"=>($old_height-$cropHeight)/2);  
}else{  
    $biggestSide = $old_width;   
    $cropPercent = .5;   
    $cropWidth   = $biggestSide*$cropPercent;   
    $cropHeight  = old_height*$cropPercent;   
    $c1 = array("x"=>($old_width-$cropWidth)/2, "y"=>($old_height-$cropHeight)/2); 
}   


	$thumbimagename = 'thumb_' . $newimagename;
	$thumbimagefull = $uploadDir . $thumbimagename;

	$thumbimage = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled($thumbimage, $oldimage, 0, 0, $c1['x'], $c1['y'], $new_width, $new_height, $cropWidth, $cropHeight);

[Psycho]

I think this is what you want. May not be the most compact/efficient code but I was only interested in getting this to work. It will reduce the image until one axis is exactly the same size as one of the target dimensions and the other dimension is bigger than the target. It will then crop the other dimension to fit the target.

 

<?php

function fitImageToSize($filename, $width_new, $height_new)
{
    $src_x  = 0;
    $src_y  = 0;

    //Get dimensions of original image
    list($width_old, $height_old) = getimagesize($filename);

    //Resize & crop image based on smallest ratio
    if ( ($width_old/$height_old) < ($width_new/$height_new) )
    {
        //Determine Resize ratio on width
        $ratio = $width_new / $width_old;
        //Detemine cropping dimensions for height
        $crop =  $height_old - ($height_new/$ratio) ;
        $height_old = $height_old - $crop;
        $src_y = floor($crop/2);
    }
    else
    {
        //Detemine Resize ration on height
        $ratio = $height_new / $height_old;
        //Detemine cropping dimensions for width
        $crop = $width_old - ($width_new/$ratio);
        $width_old = $width_old - $crop;
        $src_x = floor($crop/2);
    }

    $image_old = imagecreatefromjpeg($filename);
    $image_new = imagecreatetruecolor($width_new, $height_new);
    imagecopyresampled($image_new, $image_old, 0, 0, $src_x, $src_y, $width_new, $height_new, $width_old, $height_old);
    return $image_new;
}


$new_image = fitImageToSize($uploadFile, 100, 75);

// Output
header('Content-type: image/jpeg');
imagejpeg($new_image, null, 100);

?>

[brooksh]

That did the trick. Thanks.