How to use the GD library to convert PNG format images to JPG?

The basic requirements are: PNG picture size smaller, and then maintain a certain degree of clarity, size unchanged. How to do it?

Reply to discussion (solution)

$im = Imagecreatefrompng (' original picture name ');
Imagejpeg ($im, ' new picture name ');

$im = Imagecreatefrompng (' original picture name ');
Imagejpeg ($im, ' new picture name '); Imagejpeg ($im, ' new picture name '), can the second parameter be omitted? I tried, omitted or output PNG format AH.

That's not going to happen!

That's not going to happen! I tried, didn't change the format, but the volume became 10 times times smaller, but also became blurred. How to maintain clarity? Thank you

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