Large fonts for convert

[Joel Hammer]

I want to put some labels on images automatically in a batch mode.
convert seems like a nice way to do that, eg.
convert  -pen black  -font "7x13bold"   -draw 'text 100,100 %f' in.TIF out.TIF 

The problem is with big images. The text is too small to read.
Nothing I do seems to change the font size.
For example, 
convert  -font adobe-courier-medium-o-bold--10-100-75-75-m-60-iso8859-1  etc..
gives the same font size as:
convert  -font adobe-courier-medium-o-normal--34-240-100-100-m-200-iso8859-1 etc..

The bold and normal entries work, however.

The man X pages say that fonts of this type:
adobe-courier-normal-r-normal--0-0-100-100-m-0-iso8859-1
                               ^ ^
are scalable. You just have to change one or both of the leading zeroes to
get a specific font height. I tried that and it doesn't work, either.

Also, convert says it will take postscript fonts, but I don't see how to get them

Any suggestions appreciated,
Joel