If you're using povray to make an image,  the only thing you need to
consider is the 800x600 or the pixel dimensions.   The dots per inch as you
create the image, especially for JPG's,  really has no meaning:  it really
only has useful meaning in the output device.

> Portfolio (horizontal):  1650 pixels x 1100 pixels  = 11" x 16.5"

Zazzle will either sell someone an 11x16.5 inch poster or a 15x22.5 inch
poster, etc.  The number of pixels in your image (not **your** "dpi")
determines which size options will be available to your customers, based on
the  "dpi" capabilities of the printer **at zazzle**.   The more pixels, the
more different size posters will be available.

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