I've been trying to determine the proper calls and parameters available for JPG conversions (mainly, scaling and image quality).  But I've run into a result from a very basic conversion that has me baffled.  Using a simple example I found, I can control the quality of the result (e.g., 80%, 90%, etc).  But something is altering the colors and I can't determine what setting is involved. The example, below, shows the results I'm seeing.  All 21 lines of the related conversion code is shown on