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We clearly pass the img quality to Imagemagick in the call to it based on what you have set
$syscmd = "\"{$Globals['mogrify_command']}\" -quality {$Globals['imgquality']} -geometry {$newwidth}x{$newheight} $shellpath";
see this
-quality {$Globals['imgquality']}
Quality is set to whatever you have it set to.
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