PHP Quality preview photos?

Question

PHP

Hello.
What can be used to achieve the same quality of creating photo previews as VKontakte?
I am using GD.
Vkontakte photo quality :

Photo quality by my script:

Large photo: habrastorage.org/storage/cc25b25a/d18df0d0/cf683fb...
With all this, a VKontakte photo with the best quality weighs 7kb, and mine is 16kb ...
My script: pastebin.com/YUAYdPCf
There are actually 2 problems to be solved.
Make the quality better and at the same time reduce the size of the preview.

Answer 1

[may be wrong]imagecopyresized replace with imagecopyresampled[/may be wrong]

Answer 2

Use GraphicsMagick - and don't forget to use a filter to add sharpness .
The filter gives clarity to the image, (although it is not used in the example on the VKontakte photo)
in the console call add the parameter '-sharpen 1x10'
(you can also ImageMagick there also has this filter)
a fragment for GraphicksMagick of one PHP or (I don’t remember the name, but if you are interested I will find it)

$command = $this->gmPath.' convert'
. ' ' . escapeshellcmd($path) . ' -crop'
. ' ' . $srcWidth . 'x' . $srcHeight . '+' . $srcX . '+' . $srcY
. ' -resize ' . $dstWidth . 'x' . $dstHeight
. ' -sharpen 1x10'
. ' -quality 75'
. ' ' . escapeshellcmd($cacheFile);
exec($command);

Answer 3

I think VKontakte does not use GD. At one time, he himself faced a quality problem. It's better to use imagemagic.

Answer 4

Use imagemagick
convert FROM -resize WxH -quality 90 TO
PHP example:
$original
exec('convert '.$original.' -resize '.$size.' -quality 90 '.$to);