Problems when converting pdf to thumbnail

[singlchu]

We have converted most of our first page of the pdf to a thumbnail without any problems. But for some pdf we have oversized pages either the first page or within the pdf. When we try to convert these files, the thumbnail turned sideway. Is there anything we can do for these pdfs?

Thanks for your input.

Sing

[singlchu]

Here's the command that I used:

convert test.pdf[0] -thumbnail 120x90 -sharpen 10 test1.gif

Thanks,

Sing