[Solved]What is the difference between Export option(source code) of BrOffice 3.0 and LibreOffice 4.2? [closed]

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Hello!

I am trying to export bitmap images at LibreOffice 4.2 with the following properties: 640x480 pixels, 75 pixels/inch and no RLE compression as i did at BrOffice 3.0 but i haven't had the same result. I realized that there is a deformation around the border of any colored rectangle. New varied colors are showed if zoom it.

How can i solve this deformation? is there a better resolution for this size (640x480 pixels)? Could that problem be related with smooth filter?

BrOffice 3.0 result: C:\fakepath\Resultado BrOffice.png

LibreOffice 4.2 result: C:\fakepath\Resultado LibreOffice.png

Thanks!