exporting pdf vs. jpeg

[shortmort37]

I'm attempting to make a banner with two color background, with text containing two different colors - but, with different fonts (in different layers). All told, there are 10 layers, one with zero opacity - I used it as an underlying guide to construct the banner.

When I export it as a jpeg, everything is aligned perfectly - but of course, when you zoom you get the staircasing you expect from a bitmap:



When I export it as a pdf, it zooms perfectly, again as you would expect from a vector-based image. However, There is some blurring at the border of the two background colors, as if they are blended from misalignment; and there is whitespace at the right and bottom edges. Here is a jpeg snapshot of the pdf, where I've outlined the artifacts:



When I rendered the pdf, I chose these options:




Is there anything I can do differently, to have the pdf render in appearance as the jpeg?

I should add there's issues with font alignment from the various layers. Look at the "!" that trails "HERE". They are different fonts (and different layers) - they align at the base of the text in the jpeg, but not in the pdf.

Is this a bug with GIMP?

Thanks
Dan