high res image resizer

[dweb]

hi

 

i am running this php image resize and crop script

function img_process($max_width, $max_height, $source_file, $dst_dir)
{
$imgssize = getimagesize($source_file);
$width = $imgssize[0];
$height = $imgssize[1];
$mime = $imgssize['mime'];
$dst_imgs = imagecreatetruecolor($max_width, $max_height);
$src_imgs = imagecreatefromjpeg($source_file);
$width_new = $height * $max_width / $max_height;
$height_new = $width * $max_height / $max_width;
if($width_new > $width)
{
$h_point = (($height - $height_new) / 2);
imagecopyresampled($dst_imgs, $src_imgs, 0, 0, 0, $h_point, $max_width, $max_height, $width, $height_new);
}
else
{
$w_point = (($width - $width_new) / 2);
imagecopyresampled($dst_imgs, $src_imgs, 0, 0, $w_point, 0, $max_width, $max_height, $width_new, $height);
}
imagejpeg($dst_imgs, $dst_dir, 100);
if($dst_imgs)imagedestroy($dst_imgs);
if($src_imgs)imagedestroy($src_imgs);
}

can anyone tell me how to get it producing higher quality images?

 

thanxs

[vinny42]

What's wrong with the quality you are getting?

[mentalist]

Either make it bigger, i.e. 300dpi / 72 = 4.17, then scale w n h by 4.17, but that's probably unsatisfactory...

 

So, use ImageMagick instead of GD

http://php.net/manual/en/imagick.resampleimage.php

http://php.net/manual/en/imagick.setresolution.php

etc...

[mentalist]

Just for info's sake...

 

There may be a way using the HTML5 canvas, create it at a size then use canvas.scale(), there is a way to save this image ut can't remember it since never used it, only drawback is that it may have to be done clientside if that's acceptable?

[Barand]

If you do it clientside you have the overhead of always downloading the original large image

[mentalist]

If you do it clientside you have the overhead of always downloading the original large image

For that after thought I was thinking of uploads...?

[vinny42]

 

If you do it clientside you have the overhead of always downloading the original large image

 

You generaly don't resize on-demand anyway.