PHP Language - Poor quality on resized images

Author

Poor quality on resized images

Dag Eilertsen

2004-07-06, 8:56 pm

The script below resizes images into two different sizes. My problem is that
the quality of the resized images is poor. Any idea how to improve my
script? The users are only uploading jpg's.

Thanks!
Dag Eilertsen
________________________________________
____________________________________
_

$bilde = "./" .$lagringssti .$filnavn1;
$pic = @imagecreatefromjpeg($bilde) or die("Sorry!");
if ($pic)
{
// Make thumb
$width = imagesx($pic);
$height = imagesy($pic);
$twidth = 100;
$theight = $twidth * $height / $width; // Regner ut høyden

$thumb = @imagecreatetruecolor ($twidth, $theight) or die ("Can't
resize!");
imagecopyresized($thumb, $pic, 0, 0, 0, 0, $twidth, $theight, $width,
$height); // Resize to thumb
imagegammacorrect($thumb, 1.0, 1.5);

ImageJPEG($thumb,$lagringssti .basename($filnavn1,'.jpg')
.."_thmb.jpg",100); // JPEG of thumb

// Make small image
$twidth = 230; // Vidde satt til 230 pixler
$theight = $twidth * $height / $width; // Regner ut høyden
$mediumPic = @imagecreatetruecolor ($twidth, $theight) or die ("Can't
change size");
imagecopyresized($mediumPic, $pic, 0, 0, 0, 0, $twidth, $theight, $width,
$height);

imageJPEG($mediumPic,$lagringssti .basename($filnavn1,'.jpg')
.."_small.jpg",100);

imagedestroy($thumb);
imagedestroy($mediumPic);

// Delete the original file
list($stamme, $extension) = split("\.", $filnavn1);

unlink($lagringssti .basename($filnavn1));

} // End: if ($pic)

gridlock

2004-07-07, 3:56 am

Try using the imagecopyresampled() function instead of the
imagecopyresized() - it worked a whole lot better for me

"Dag Eilertsen" <dag.erik.eilertsen@broadpark.no> wrote in message
news:40eb2aca$1@news.broadpark.no...
> The script below resizes images into two different sizes. My problem is
that
> the quality of the resized images is poor. Any idea how to improve my
> script? The users are only uploading jpg's.
>
> Thanks!
> Dag Eilertsen
>
________________________________________
____________________________________[col
or=darkred]
> _
>
> $bilde = "./" .$lagringssti .$filnavn1;
> $pic = @imagecreatefromjpeg($bilde) or die("Sorry!");
> if ($pic)
> {
> // Make thumb
> $width = imagesx($pic);
> $height = imagesy($pic);
> $twidth = 100;
> $theight = $twidth * $height / $width; // Regner ut høyden
>
> $thumb = @imagecreatetruecolor ($twidth, $theight) or die ("Can't
> resize!");
> imagecopyresized($thumb, $pic, 0, 0, 0, 0, $twidth, $theight, $width,
> $height); // Resize to thumb
> imagegammacorrect($thumb, 1.0, 1.5);
>
> ImageJPEG($thumb,$lagringssti .basename($filnavn1,'.jpg')
> ."_thmb.jpg",100); // JPEG of thumb
>
> // Make small image
> $twidth = 230; // Vidde satt til 230 pixler
> $theight = $twidth * $height / $width; // Regner ut høyden
> $mediumPic = @imagecreatetruecolor ($twidth, $theight) or die ("Can't
> change size");
> imagecopyresized($mediumPic, $pic, 0, 0, 0, 0, $twidth, $theight,[/color]
$width,
> $height);
>
> imageJPEG($mediumPic,$lagringssti .basename($filnavn1,'.jpg')
> ."_small.jpg",100);
>
> imagedestroy($thumb);
> imagedestroy($mediumPic);
>
> // Delete the original file
> list($stamme, $extension) = split("\.", $filnavn1);
>
> unlink($lagringssti .basename($filnavn1));
>
> } // End: if ($pic)
>
>

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