How can one entire document use pixels as a unit of measure when there are several objects built out of pixels that all use different sized pixels? Answer: it can’t because it is impossible. Each of these objects can be further enlarged or reduced in Illustrator, further varying the pixel size for each object. Each of these types of object can have its own defined pixel size. But Illustrator is object oriented, and some of those object can be pixel-based, such as the appearance of a drop shadow effect, artwork rasterized within Illustrator, or artwork imported into Illustrator. Everything in Photoshop is pixels, so it’s a simple idea to keep the pixel size (defined under Image > Image Size) consistent throughout one file.
Photoshop is a pixel based graphics program. Photoshop and Illustrator are very different programs, for good reason. Illustrator is assuming you will export your file as a raster image at 72 pixels per inch, so the half-inch image will end up being 36 pixels wide. Switch units to pixels, and your 72 pixels by 72 pixel image will be reported as being 36 pixels by 36 pixels. You will get the same image, but only one half inch wide and tall. Save a copy, but with one change: change the resolution to 144 pixels per inch (Resample set to None). Place that image in Illustrator and that’s what you’ll get. It’s easy to see that, when printed, the image should be a square, one inch wide and one inch tall. Let’s use a 72 pixels by 72 pixels file that is 72 pixels per inch. Try this: Open an image in Photoshop and look at the size in Image > Image Size. That guarantees that pixels cannot ever be used as a unit to define sizes, since pixels have no physical size. Every object and every artboard in an Illustrator file has a physical size, which tells Illustrator how large things will be when they print. But Illustrator was build to be used for creating vector drawings for print, and that will always be in every Illustrator file’s DNA. Pixels, when properly used as a unit of measure for an image, have no physical size. Adobe does not want you to know this, but it is a fact. Once again: There is no such unit as pixels in Illustrator. ai file in Photoshop and letting Photoshop rasterize? Whichever you are using, what settings are you using? Are you using File > Export? Are you using Save for Web and Devices? Are you copying and pasting to Photoshop? Are you opening the Illustrator. You still have not explained how you are exporting your artwork. jpg file opens ten times larger in the latter. Nevertheless, despite the fact that pixels are chosen in both Illustrator and Photoshop, the exported. jpg (because I'm using it in Dreamweaver) and opening it in Photoshop the IMAGE>IMAGE SIZE is set to pixels. In Illustrator, in EDIT>PREFERENCES I've selected pixels for "general" and "stroke". I'm using Illustrator CS4 and Photoshop CS4.
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