added a comment

src/Convert/Converters/GraphicsMagick.php

@@ -97,10 +97,18 @@ private function createCommandLineOptions()
     {
         $commandArguments = [];
 
-        // Unlike imagick binary, it seems gmagick binary uses a fixed
-        // quality (75) when quality is omitted
+        /*
+        if ($this->isQualityDetectionRequiredButFailing()) {
+            // Unlike imagick binary, it seems gmagick binary uses a fixed
+            // quality (75) when quality is omitted
+            // So we cannot simply omit in order to get same quality as source.
+            // But perhaps there is another way?
+            // Check out #91 - it is perhaps as easy as this: "-define jpeg:preserve-settings"
+        }
+        */
         $commandArguments[] = '-quality ' . escapeshellarg($this->getCalculatedQuality());
 
+
         // encoding
         if ($this->options['encoding'] == 'lossless') {
             // Btw: