(CS4) Why is Premiere CS4 modifying TIFF files in a sequence?

Hello,
decided to post here, because I didn't find any old postings of this subject anywhere.
I'm composing 2-d drawn animation on AE and editing in Premiere, then importing to
Avid media composer for exporting to Sony Digital Beta tape via SDI. When working in
CS3 and earlier, everything was nice, AE made about 1730 kB TIFF files and Premiere
kept them the same size, you just needed to select export -> movie... Tiff sequence,
deselect recompress, select best quality and optimize stills. File sizes were the same,
and I could rest assured that the original AE image quality was still there.
Now in CS4, something fundamental has changed. AE CS4 still makes perfect TIFF
animation frames (at 1024x576 same as CS3, about 1730kB and at 1050x576 about
1770kB).
So far, so good.
In Premiere 2.0 and 3.0, you could select a preselection 720*576 pal widescreen
composition and when exporting the edited animation would get the same pixel-level
IQ as from a custom Desktop: 1024*576 square pixel composition, when using the
Export movie described above. This to me looks like Premiere uses the original
TIFF material.
But in Premiere 4.0, something weird happens. If I use a 720*576 pal widescreen
preset (with AE CS4 1050*576 animation sequences) and export 1050*576 pal
widescreen square pixel image sequences, Adobe Media Encoder chops off 330
square pixels and stretches the image horizontally for blurred, sad results.
EXPORT MOVIE never did this!
Having found that out, I use only custom-> desktop: 1024 or 1050 projects now,
but here again something weird happens: Adobe Media encoder adds about 600kB
to every TIFF frame, and I'm almost unable to notice the difference, but I would say
that the images certainly don't look any better than the ones that were imported to
Premiere, more on the opposite. So, in every option but when exporting one TIFF at
a time Media Encoder alters the superb AE TIFFs.
Why on earth does Adobe want to add a huge amount of useless bits, in animation
the disk space required increases very significantly. What was wrong with the
EXPORT MOVIE option?
I'm asking should I just edit in Premiere 3 if I want unchanged, superb AE quality
TIFF sequences? Premiere gives it when I export only 1 frame, but as soon as I tick
"Export as sequence" it starts Adobe Media encoder which affects all frames, even
those with no Premiere effects on them. Premiere 3 preserved original IQ even in
PAL editing mode (export movie uncompressed) but Encoder in CS4 either
loses 30% of the pixels or adds about 600kB more air!?!?!
1050*576 is not a must for me because I want web movies to be 16:9 sqpix and
the Avid where I work in prefers 1024*576 over 1050*576 in Digital Betacam tape
exporting for uncompromised broadcasting results.
This issue is affecting many animatiors here in Finland, in CS3 and earlier there
were no problems because Premiere respected AE quality work, but now this Media
Encoder has messed things up, not selecting Custom-desktop-1024/1050 will ruin any
animation movie image sequence and selecting it makes files A LOT bigger without any
improvement in IQ.
I hope someone from Adobe could explain what on earth is going on in Premiere
development? Many animation professionals in Finland are awaiting your kind reply.
Anyone with a clue what's going on in the altering can give a hand!
Olli Laamanen, Finland

I did additional testing by comparing exported frames from Premiere
to the AE frames. Only when I delete all render files before export, do I get
the same image pixel-wise. But then there's the extra ~600kB of data.
Does anyone know what that is, a colleague suggested it might be the color
profile or some metadata added by adobe media encoder. I'd really like
to know what it is! Someone who knows something about this Adobe
Media Encoder might have the answer.
So if you are using AE and Premiere to make animation and want to
keep your master footage unchanged, the equivalent for CS3 export ->
movie -> TIFF uncompressed is to
-work only in desktop mode
-delete all render files before exporting media through the encoder
otherwise CS4 will change your images.
Like this it doesn't change the images but adds over 30% additional
data (somekind of tags/metadata)?
Anyone with a guess what it is, please help!

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