I was actually happy with the way the images turned out, and they do look better on the Kindle than they do on the computer screen. As wallcraft pointed out the images are at the maximum Kindle resolution (525x640). I hadn't even tried just loading the color version to the Kindle, so thanks wallcraft -- that will save me some time.
By the way, I was able to confirm definitively that 525x640 is the maximum size of an image inside of a Kindle ebook. I did so by creating two images. The first was a solid black line that was 800 pixels high and 3 pixels wide, and the second was a 600 pixels wide and 3 pixels high black line. I then made a mobi file that contained these images on seperate pages, and then I did the alt-shift-G thing to take snapshots of each image. Then I loaded the snapshots into photoshop and selected each line and cropped the image to what was selected. The 800 pixel high image had been resized to 640, and the 600 pixel wide image had been resized to 525, so that is definately the maximum size. (Most of you already know this, but I wanted to explicitly state it for new users coming to this site.)
I also used photoshop to examine the grayscale of the images produced by the Kindle. The four colors of gray are Black (#000000), Dark Gray (#555555), Light Gray (#AAAAAA), and White (#FFFFFF). It's my understanding that the Sony has a grayscale of eight instead of four and that the Kindle uses the same screen manufacture as Sony, so why the Kindle limits itself to 4 colors is kind of strange.
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