Photoshop's JPEG Algorithm - from a website (Apache) environment

I'm not sure if this is the correct forum for this post, but none of the others seemed to fit either.  Here is my situation: I am the programmer for a website that maintains images.  I need to modify the images "on the fly", and I've done what needs to be done using a php module called GD2.  The problem is this: the saved JPEG images, even when saved at quality=100, are no match for the images as saved via photoshop. The website runs php code under Apache in a Linuz environment.
So, my question is this: what image manipulation tool is available to me in that environment (php, Apache, Linux) that uses photoshop's JPEG writing algorithm?
Original Image created by photoshop:
Image that results from simply read / save 100% in GD2.
FYI, I also opened the image using IrfanView, and saved it at 100%, the results are a near match to what I got from GD2.

Thanks for the reply....I marked it correct answer even though I am devastated by it.
Beleive it or not, that second JPG WAS saved at 100% quality.  In fact, here is the same starting JPG, using the popular free utility IrfanView, again saved with quality=100%.
Part of the reason this looks so bad is that I created an image with red details on a blue background, I guess the human eye is more sensitive to those colors.  So...follow up question - since you say "you should be able to get a lot closer than that", does anyone know what other alternatives ARE available for me?  Most of our images are NOT going to be this sensitive, but still, I don't think we will view this option as acceptible.
(and should I make that Q a separate thread since this one already has a "correct answer" flag attached to it?)

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