CODEWITHSUNDEEP
phpimagegdthumbnails
Ross
Ross

Reputation: 11

Creating jpg thumb with php

I am having problems creating a thumbnail from an uploaded image, my problem is

(i) the quality (ii) the crop

http://welovethedesign.com.cluster.cwcs.co.uk/phpimages/large.jpg http://welovethedesign.com.cluster.cwcs.co.uk/phpimages/thumb.jpg

If you look the quality is very poor and the crop is taken from the top and is not a resize of the original image although the dimesions mean it is in proportion.

The original is 1600px wide by 1100px high.

Any help would be appreciated.

 $thumb =
 $targetPath."Thumbs/".$fileName;

    $imgsize =
 getimagesize($targetFile);  $image =
 imagecreatefromjpeg($targetFile);
  $width = 200; //New width of image   
 $height = 138; //This maintains
 proportions

  $src_w = $imgsize[0]; $src_h =
 $imgsize[1];



 $thumbWidth = 200;  $thumbHeight =
 138; // Intended dimension of thumb

 // Beyond this point is simply code.

 $sourceImage =
 imagecreatefromjpeg($targetFile);
 $sourceWidth = imagesx($sourceImage);
 $sourceHeight = imagesy($sourceImage);

 $targetImage =
 imagecreate($thumbWidth,$thumbHeight);
 imagecopyresized($targetImage,$sourceImage,0,0,0,0,$thumbWidth,$thumbWidth,imagesx($sourceImage),imagesy($sourceImage));

 //imagejpeg($targetImage,
 "$thumbPath/$thumbName");
 imagejpeg($targetImage, $thumb);

 chmod($thumb, 0755);

Upvotes: 1

Views: 481

Answers (3)

user644602
user644602

Reputation: 44

You would not worry if you would use the Thumbnailer.

$th=new Thumbnailer("your-photo.jpg");
$th->thumbSymmetricWidth(200)->save("your-thumb.jpg");

The quality is superb. You can also round the corners.

Upvotes: 0

zaf
zaf

Reputation: 23244

You're using the wrong variable for the image height.

imagecopyresized($targetImage,$sourceImage,0,0,0,0,$thumbWidth,$thumbWidth,imagesx($sourceImage),imagesy($sourceImage));

Should be:

imagecopyresized($targetImage,$sourceImage,0,0,0,0,$thumbWidth,$thumbHeight,imagesx($sourceImage),imagesy($sourceImage));

This should improve image quality but you should use imagecopyresampled for resizing and use the quality parameter when using the imagejpeg() function when saving to disk.

Upvotes: 1

nik
nik

Reputation: 3678

Every time u create a thumbnail the DPI of the image has to go low and thus it is not possible to have the same quality, however u can check imagecreatetruecolor (https://www.php.net/manual/en/function.imagecreatetruecolor.php ) for improvement

Upvotes: 1

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