Re: [PHP] thumbnail

[Chris Edwards]

This works like a charm on JPG, haven't tried it on other files types. This
came from the www.php.net


function image_createThumb($src,$dest,$maxWidth,$maxHeight,$quality=100) {
   if (file_exists($src)  && isset($dest)) {
       // path info
       $destInfo  = pathInfo($dest);

       // image src size
       $srcSize  = getImageSize($src);

       // image dest size $destSize[0] = width, $destSize[1] = height
       $srcRatio  = $srcSize[0]/$srcSize[1]; // width/height ratio
       $destRatio = $maxWidth/$maxHeight;
       if ($destRatio > $srcRatio) {
           $destSize[1] = $maxHeight;
           $destSize[0] = $maxHeight*$srcRatio;
       }
       else {
           $destSize[0] = $maxWidth;
           $destSize[1] = $maxWidth/$srcRatio;
       }

       // path rectification
       if ($destInfo['extension'] == "gif") {
           $dest = substr_replace($dest, 'jpg', -3);
       }

       // true color image, with anti-aliasing
       $destImage = imageCreateTrueColor($destSize[0],$destSize[1]);

//CAE       imageAntiAlias($destImage,true);

       // src image
       switch ($srcSize[2]) {
           case 1: //GIF
           $srcImage = imageCreateFromGif($src);
           break;

           case 2: //JPEG
           $srcImage = imageCreateFromJpeg($src);
           break;

           case 3: //PNG
           $srcImage = imageCreateFromPng($src);
           break;

           default:
           return false;
           break;
       }

       // resampling
       imageCopyResampled($destImage, $srcImage, 0, 0, 0,
0,$destSize[0],$destSize[1],$srcSize[0],$srcSize[1]);

       // generating image
       switch ($srcSize[2]) {
           case 1:
           case 2:
           imageJpeg($destImage,$dest,$quality);
           break;

           case 3:
           imagePng($destImage,$dest);
           break;
       }
       return true;
   }
   else {
       return false;
   }
}
//// Calling code

     if ($photosize >= 102400 ) {
        $blReduce = true;
     }
     // reduce the size of a file down to 720x720 pixels at 80% quality
     if ($blReduce) {
        image_createThumb($src,$src,720,720,80);
     }

    //Create a thumbnail were the maximum width or height is 100 pixels at
100% quality
    // $src is the full path/filename of the large jpg file
   //$desc is the full path/filename of the thumbnail to be created
    image_createThumb($src,$dest,100,100,100);




----- Original Message ----- 
From: "Matt Matijevich" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, January 20, 2004 6:24 PM
Subject: Re: [PHP] thumbnail


> [snip]
> OK, but how? I already use GD, I need to now how to create a thumbnail,
>
> somebody now how to use the GD functions to create a thumbnail???
> [/snip]
>
> http://www.php.net/GD
>
> I think you want to look at:
> imagecopyresampled -- Copy and resize part of an image with resampling
> imagecopyresized -- Copy and resize part of an image
>
> or try this pear class  http://pear.php.net/package/Image_Transform
> like <[EMAIL PROTECTED]> suggested.
>
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