Source? This is 2010 - most animation studios should have already switched to a properly-HD workflow a couple years ago, even if the broadcasters use lower-quality copies to air. Especially with the Blu-ray releases that are available now - they can't all be upscaled, not even most of them (since the companies wouldn't hear the end of it - I remember the hoopla over the news that the Air Blu-rays were supposedly upscales, and that was several years ago; it simply would not be in their best interests to keep doing that; for animation the process wouldn't be as that hard to adapt, either).
Originally Posted by hajialibaig
'HD' is 720p, 1080i, & 1080p, 2K, 4K, and RED Digital Cinema 2540p (720i is possible, but it's not a broadcast or disc standard). Those last three may eventually be remarketed at Ultra HD along with 8K, though. 1080i reconstructs to 1080p, and 720i would reconstruct to 720p.
The hallmarks of an upscale are threefold: banding, line breakage, and ringing (ringing can also be seen on downscales that use certain methods). Filtering it with AviSynth generally can't mask or totally rid the upscale of these problems.
EDIT: Seems I found the reference page and their explanations for what all that terminology is. http://gorry.haun.org/pw/?20091001_tvaformat
According to that chart, 46 series are actually proper HD (denoted as 'HV' on that table). 19 of them are 'SD up', 3 (including Bleach) are 'SD field up', and still smaller numbers are other aspect ratio/matting differences; most Blu-ray editions are indeed of shows that fall in the proper HD range. The source pages that they use to explain what these terms mean, being run through Google Translate, strikes me as counterproductive as to what is going on. It *seems* that they're trying to say 'SD field up' refers to field-separated video that's been essentially blown up, weaved, and then blurred or smoothed.
The problem is that, trying to replicate this methodology with a proper 720p source debunks this notion - it was still blatantly obvious what I'd done to it, and those artifacts don't appear on the RAWs. The site doesn't seem to make reference to what hardware (or software, if relevant) solution was used to produce the result, and I also can't seem to find any reference to how they found out how these series were treated by the station. So unless I can find a better resource, I wouldn't trust it.
Here's the example. I took a source that I know is truly 720p, and compared the original to a copy I downscaled, interlaced, then upscaled to 1080, deinterlaced, then downscaled to 720p. Because there's thick lines and I used a high-quality resizer, broken lines aren't present (or aren't as present, at any rate). Ringing, however, plainly is. Open them in new tabs and switch back and forth.
The script I used to produce the upscaled copy is below:
At most it's blurrier (but this doesn't really seem applicable to Bleach because the 720p's are rather sharp, without the usual signs of post-capture sharpening filters and the like).
Global NewHeight=1080 # Whatever
Global NewWidth=1920 # Whatever else
Shift=(Height()/Float(NewHeight)-1.0)*0.25 # Field shift correction
Tf=SelectEven().Spline64Resize(NewWidth, NewHeight/2, 0, -Shift, Width(), Height())
Bf=SelectOdd().Spline64Resize(NewWidth, NewHeight/2, 0, Shift, Width(), Height())