I'm having some trouble creating a PDF with Photoshop.

The client wants the final file to be "a PDF at 300 dpi".

I have an image (3300 x 2550 pixels @ 300 dpi) in Photoshop. (11" x 8.5" canvas)

It seems that no matter which method or setting, my PDF is always saved at 72 dpi because the PDF ends up at 792 x 612 pixels every single time.

I'm using Photoshop CS2 on a Mac. I've tried a "save as PDF" from the file menu and I've also tried a "save as PDF" from the print dialog box.

I even saved it as a TIFF (3300 x 2550 @ 300 dpi) and opened in GraphicConvertor, then saved as a PDF. Same problem... the PDF is only 72 dpi (792 x 612 pixels).

So how can I get the final PDF size to be 3300 x 2550 pixels @ 300 dpi?