Mark Lemmon clears up some of this...the short version is, no, you're not crazy, the binned images really are blurrier.
QUOTE
First, the binned images should look sharper (more aliased) than full-res images. They do not. There are a handful of bugs in SSI flight software, too small to get attention away from other aspects of the mission, large enough to annoy. In this case, it was discovered in December that the implementation of the binning makes it act as a type of low pass filter. In the absence of compression, that error is reversible. The compression makes it only partly reversible. The fix is simple, but that is not a major factor--replacing FSW is intrinsically complex. For reference, we had a patch to replace our auto-exposure algorithm in January. RAC was just allowed to use auto-exposure for the first time in flight a couple sols ago; SSI is still working on it. We've used manual exposures all mission long. That's despite the fact that we used auto-expose without issue in our readiness tests.
Second, there are more elements to putting the pan together than I can speak to. One element that I can, is that I never had time to use and check the upconversion routine (recovers full res from the binned images quite well) on all 300-some binned frames, and some form of simply scaling the images up was used instead, to the best of my knowledge. Phoenix is amazingly complex to operate, and the team is simply not big enough to be able to operate it well and do all the processing we would like. Doing the best job we can with the images is something that has to be deferred.
Third, I would expect a better version of same pan (better includes filling in the black spaces). That won't come until the ops pace has eased, certainly not until well after the disruptions of the next few weeks. In addition, the HEA pan has no binning, less compression in all filters, and little compression in stereo filters.
Hope that clears things up!
Emily