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Default Anti-alising in copied charts

Gang,
Mac question here, although I understand it may be just as much a
problem on Windows.

I recently upgraded from Office '04 to '08. I have a pair of charts
created in Excel that I used to copy and paste into Photoshop, then save
as jpg format images for posting on a web page. I update the charts
periodically, then go through the conversion process in Photoshop each
time.

The first time I've tried this with the '08 version of Excel,
I noticed 2 differences in the process when I'm pasting the image
into Photoshop.

The first is that it pastes into a "bounding box" (which then requires
that I right click and select Place to complete the paste). The second
is that the resulting image is notably blurry. The resolution and size
of the image are the same as I used previously.

I thought it was my eyes, so I opened up an earlier version of the jpg
file that I had created when I was still using Excel '04, and side by
side with the new jpg, there was a marked difference in clarity. In
order to get my newly pasted image to look a little better, I had to
increase the jpg quality (and thus increase the file size), but it still
doesn't look as sharp as before.

Here is one of the new images:
http://www.sci.sdsu.edu/c-beach/imag...te-stacked.jpg


I don't claim to know anything about Photoshop except for a couple
basics, so I have no clue what the appearance of the bounding box may
imply about the image, but something is obviously different about the
image that I copied from Excel '08 that is causing Photoshop to treat it
differently than it did when I used Excel '04.

Any ideas?

TIA,
Dennis