Aperture Image Resolution Problem

I know there have been a lot of posts about image resolution, but I haven't found an answer to my problem.
I use a DLSR and and shoot in RAW and/or maximum resolution JPG. When imported to Aperture, the file size is usually in the 10-15MP range. However, when I try to email photos in their "actual size" or export photos to BookSmart (blurb) to create a photo album, the photos become compressed (to about 1MP). According to blurb support, my 10MP images are only 96 dpi, and not enough for a high resolution image.
I have my image export presets set to highest quality, original size, and 300 dpi, so I don't know what the problem is. Can anyone help me?

Agree.
OP:
A quick review, just so we are on the same page.
Digital image files have two "sizes".
The actual image size is measured in pixels. The digital image comprises a grid of colored dots. Each dot is a pixel, which is short for picture ellement. The dimensions of the image are given as so many pixels in one direction (usually height) by so many pixels in another direction (usually width), e.g.: 600 x 800 pixels, or 4,000 x 6,000 pixels. The overall "size" of the image is calculated by multiplying the height by the width. In the examples given, the first image is (600 x 800 = ) 480,000 pixels. The second image is (4,000 x 6,000 = ) 24,000,000 pixels.
That's a lot of pixels. The size is often given in megapixels, where 1,000,000 pixels = 1 megapixel (abbreviated MP). So the first image is approximately half a megapixel, and the second one is 24 MP.
Pixels themselves have no other unit of measurement. There is no way from the pixel count to know how many inches (or centimeters) an image will be when printed or shown on a screen. In order to determine that, you must have the pixels-per-inch (PPI) of the printer or screen (or projector, or any other display device). A 600 x 800 px. image, at 100 PPI, will be 6 x 8 inches.
Pixels are device independent. PPI tells some programs and devices how big to display (or print) an image.
The other image file size measures how much data is in the file. Data is measured in bytes. One thousand bytes is a megabyte, abbreviated "MB".
Generally, the larger the image size, the larger the file size. But this is not necessarily so, and shouldn't be used as anything but a very general guide.
Your question is about resolution, which is a question of density: how many pixels there are in a given area. This is commonly measured in PPI. Resolution and file size are independent.
Message was edited by: Kirby Krieger

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