Line distortion in png export

I have a number of identical lines in my image (attached). However, when the image is exported, the lines look slightly different (some appear thicker or blurry). I have tried both the save for web at original png 24 option and the export option from the file menu.
I would appreciate any help in getting this exported so the lines look the same please. Thank you.

jkadobel,
How do I align them to a row of pixels as you suggest? I should note the lines are only 0.25 pixels high in illustrator (is designing at levels below 1 pixel bad?).
Each should be placed fully within one pixel row, preferebly at the same vertical position within it. The use of 0.25 pixel lines results in paler lines, not thinner lines.

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The bitmap is too large. The largest bitmap that can be created is 8000x8000 pixels.
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To reproduce this behaviour create an FLA in CS4, make 3 keyframes, draw a filled rectangle (or whatever) on each frame then save it somewhere (ie C:\test.fla)
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I just bought a Cannon HV-30, which I'll be using to film an instructional DVD. I'm hoping to use iMovie 06 to edit, and was planning on using iDVD until I realized how tricky DVD authoring is, if you want to sell thousands of copies of your DVD and have any hope of them playing on people's DVD players.
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Hi All,
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I crreated a package of variants on the company logo and exported them from Illustrator as PNGs. I even tried them at 150dpi - then 600dpi.
When I put them into MS Word or Apache Open Office documents they look perfect: sharp, crisp, perfect curves. Hurrah!
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johnivanwhite wrote:
Hi John M,
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Right. What you're seeing there is the Windows Metafile format's lack of support for bezier curves. Close inspection reveals curves that are made up of many small straight line segments.
However...
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Ok let me try to explain...
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http://i213.photobucket.com/albums/cc291/madindehead/PremierePro_export_weird.png
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Line distortion in png export

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