[pdftex] PS pictures

[matthieu foillard]

hello,

i've add some ps picture to a latex document with a command 
like this :
	  \includegraphics[width=4.939cm]{./images/pro.ps}
the dvi/ps document is ok, i can see the picture but when i 
convert it to PDF, this picture isn't present, why ?
moreover, i'm using The Gimp to convert origninal (tiff) image to ps 
but the ps picture is really poor quality, how can i improve quality
for both screen display and printing ?

thank for your help,

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		  <matthieu at hert.org>
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