Digital BW, The Print

You did nothing wrong, that's a good practical test.  

It does not really stress interpolation routines taking a 6 mpixel
image up to 12x18 on matte paper, though.  That's about 166 dpi of
original pixel content, so the interpolation only needed to get
another 40 to 80 dpi to get a photo quality image on matte paper.  The
dithering in the Epson driver plus the matte surface do an excellent
job of masking artifact in normal photo images.

I would not expect to see much difference in any of those methods
unless you use much more enlargement.  You might see more difference
on a sharper media like a glossy.

Another way to look at it.  Your 6 megapixel 10d images print at 12x18
on matte paper.  You may be able to get much bigger images out them
with great interpolation.  Depends on the image.

 "btvarner" <bthomasv@c...> wrote:
> I have been following this thread with great interest & decided to do 
> a little test myself.  
...
> Also note that the Raw image I picked was from a Canon 10D & 
...
> Re-sampled 1st image to 12x18 at a resolution of 360 in Photoshop 
> using bicubic,
> Applied creative sharpening using Photokit Sharpener Pro,
> Printed using "SP220 EnhancedMatt 2880PK.icc" printer profile,
> All print driver corrections turned off