This has worked for others:
With your example of a 20"x20" image, use the Sprite Helper to divide the image into 5"x10" pieces.
Open each 5"x10" image individually in Paint.NET.
Expand the canvas to 8"x10", Anchored in the Middle.
Image > Canvas Size ...
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Print at 8x10 setting.
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Previous example.
Right-click > Install
==========================
If the font comes in a zip, either extract the zip contents
first or copy/paste the font file out before installing.
I just installed that font, and it shows in the Paint.NET font list. (I'm using Vista, also)
My Paint.NET font drop-down opens not showing the top of the list,
so I have to scroll up to see this font.
Pressing Esc or Ctrl+D works too.
For some unknown reason my sig isn't showing in this thread.
Can anyone else see it? (Such as it is.)
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Aha! It shows in this post, but not in the old ones.
This may, (or might not), help with the pawn:
Before rotating the pawn, resize it up by two or factors of two. (2, 4, 8, 16, ...)
(This is in terms of width and height dimension, not area.)
Then rotate and resize down.
You are referring to JPEG files?
If so, the file may have been saved originally at 70% to 80%.
When you edit it, then save at 100%, it will result in a bigger file size.
If you are given a choice between Open with
and Save File when downloading, choose Save File.
It sounds like your OS file associations may be screwed up.
What OS version are you using? (XP, Vista, etc.)
Maximum dimension allowed is 800 pixels.
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You can crop/resize to make the images fit,
and add a direct link to the full-size image, if you want.
Due to problems with Windows Clipboard it is "normal"
for alpha to paste as white occasionally.
It sounds like you're saying that this happens every time for you.
If Paint.NET has shown this type of pasting alpha as white
every time since you first installed Paint.NET, then running
PdnRepair.exe may help.
Program Files/Paint.NET/PdnRepair.exe