Using "viu" to display attached images

[Andy Spiegl]

Hi,

recently I discovered the command line program "viu" (https://github.com/atanunq/viu)
which very nicely displays images in terminal windows.  I added this line to my .mailcap:

 image/*; viu -t -n %s ; copiousoutput

Now mutt calls viu for all attached images.
But only a black rectangle is shown instead of the image.

Do you have any idea why this happens?
I compared the env variables inside a mutt shell but found no relevant
differences.  TERM is still set to "xterm".  And if I start a subshell from
within mutt and then call viu, the image is displayed nicely.  I'm a bit clueless...

Thanks for any hint,
 Andy

-- 
 If your parents never had children, chances are you won't, either.
   (Dick Cavett)