[daip] blanked pixels inside fits

[Niruj Mohan Ramanujam]

Hello Eric,

I have a question about blanked pixels in FITS files.
Documents mention that if BITPIX is -32 or -64 (which is true for most 
files these days) and if there are blanked pixels, then the value used 
is not the value of the keyword BLANK but the IEEE NAN. Though the value 
is usually given as -1.

Can I assume that if there is no BLANK keyword in a FITS file, then 
there will be no blanked pixels present ?

Thanks!
Niruj