🚀 go-pugleaf

I am in the process of documenting some work that I have done on the Mac.
To do this I am planning to include some pictures of the desktop at various
times, showing different folders.  No problem, I think, so I use
Control-Shift-3 to do some screen dumps, open them up with MacPaint, cut
them out and paste them into the scrapbook, and finally open up my document
with MacWrite and paste the pictures into the document.  No problem.  Then I
try to print it to our LaserWriter.  PROBLEM!  I get the following message:

Error: VMerror; OffendingCommand: imagemask

Does anyone know what the problem is?  I then tried the exact thing using
Word 3.0 and got the exact same error.  What is going on?  I am using a Plus
with an Apple 20 meg SCSI Drive connected by AppleTalk (of course) to an
Apple LaserWriter.  As far as I know I am using the latest drivers (3.2 I
think) and the latest system/finder combo  (3.1 and 5.3, I know, I know 4.0
is out but I'm waiting for the 'official' upgrade).  Has anyone encountered
this problem before?  Is it my fault, MacWrite's fault, the LaserWriter
driver's fault?  If you have any ideas at all please send me mail.

Thanks in advance,
Ken Settle