[gradsusr] printim error png

[teresa tiberi]

Hello

I use grads v2.0.a7.1
I made an image with png format
     'printim '_file%_zoom'.png png white -t 0 x451 y532'
but if I continue and I try to run this command
     'printim '_file_zoom2'.png png white -t 0 x451 y532 -b
'_file%_zoom'.png
I have this error:
PRINTIM error: background image must be .png
Why?
could someone help me?

Thanks in advance
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