I assume that you are using
imagejpeg(...) to output the results to a file or to the browser? If so, the last parameter controls the quality. If you don't specify a value, the default for this is about 75 percent. While this does not correspond to the values you mention, it is probably the cause of your problem. From the PHP manual -
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bool imagejpeg ( resource image [, string filename [, int quality]] )
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