I just had an outside firm convert ~750 slides taken in the early 1970s into TIFF files.  When I tried to adjust the images in Aperture there was very limited lattitude to my adjustments.  It was considerably less than with contemporary JPEG.  For example, pushing any of the sliders all the way to the right made only a slight difference.   Is there anything I’m not doing right? The slides were supposedly converted at either 3000 or 4000 dpi.  They also seem to be lacking in sharpness.  The conversion service is well reputed but I wonder whether that’s the problem.  Any suggestions are welcome.  I still have the original slides and a large second batch that have not been ditigalized yet.