ps rough edges when saving transparency

Why do images that have a transparent background have such rough edges?  Is there a way to fix this?  I cut out the image using the poly lasso tool.  Edges are straight as an arrow then BAM, save as a transparent png and the lines are jagged.  Looks terrible.  I attached same image saved as a jpg and as a png.

ps  I need the transparency for it to float ontop of website.
http://nsitedesigns.com/nsitedesigns/lakeshore/assembly.html
display-catwalk.jpg
display-catwalk.png
nsitedesignsAsked:
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David BruggeConnect With a Mentor Commented:
> Is there any advice to fix jags without making file HUGE!?

Not easily (I'll explain in a minute).

The advantage png-24 files have over the older gif files (the other way of saving transparency) is that they let you have semi-transparent pixels as well.

It's these semi-transparent pixels that give your your smoothing. This advantage only comes with the png-24 format, not the png-8.

Now, it is possible to make your png-24 files smaller, but unless you are using Photoshop CC or Fireworks CC you have to use an additional utility and you need to know how to use them.

If you are willing to get your hands dirty, here is a link to an article that gives you an explanation of what is going on, and some methods for achieving significant savings in your png-24 files.

http://www.smashingmagazine.com/2009/07/15/clever-png-optimization-techniques/
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nsitedesignsAuthor Commented:
I did find that if I saved at png 24 it did fix the jags but the image size went up considerably.  Is there any advice to fix jags without making file HUGE!?
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nsitedesignsAuthor Commented:
Just using the polarization technique of clicking New adjustment layer/polarize in ps and then saving for web cut the image size DOWN BY HALF!

Wahoo!

Thanks!
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