Determine/Reset Scale of Linked Graphics - Maximize Image Quality

Hi, we're currently using Illustrator CS4 for website comps to quickly mock-up pages for our clients to sign-off (we've explored using Fireworks, but there's just some major things missing that we need in regards to typography, global swatches, etc.).
But we would like to generate some final images from these files as well for the sake of efficiency, as I believe Illustrator is 'supposed' to use the same Save for Web interface as Photoshop. It's just very efficient for us to have our slices designed, setup, optimized and named in this same master document.
But I ran a test comparing the results when generating a final JPEG from Illustrator vs. Photoshop using the same exact settings, and on a file that was 100% of final size. But the Photoshop file was significantly sharper. So I investigated a bit more and found out that the image was scaled just a bit in Illustrator (maybe 110% or less). When I got the image to be as close to 100% as possible in Illustrator, the differences were negligible.
- So what is the quickest/easiest method of resetting an imported image to 100% of the actual size in Illustrator?
I look at the Transform palette (where I would see the scaling in InDesign), but it doesn't tell me anything. I had to look into the Link Information in the links palette to find the scale, but I can't change anything from there.
- Any other tips for keeping linked files looking as good and sharp as possible all the way through the process to Saving for Web?
- If the original image has been retouched and optimized (it's a high quality image) in Photoshop before importing into Illustrator, 'SHOULD' the results from Illustrator match Photoshop when using Save for Web and the same settings?
THANKS! It is much more efficient for us to save our graphics from Illustrator, but we can't risk losing image quality in the process.

jethrodesign wrote
Yeah, I see that as long as the image has a resolution of 72dpi, it does come in at 100% of size. ..
For what you want to achieve you are right, sort of, but your statement is wrong.
Images are always placed at 100% size as indicated in the info when you double click the links in the Links palette. However you have to understand what size means here. If the image has metadata containing dimensional information then that is the size in Illustrator. For example if the metadata says 5 x 5 inches it will be placed as 100% with that size according to the Illustrator's rulers regardless of what the pixel resolution of the linked image is - it can be 5 or 5000 pixels per inch. If the images don't have metadata describing the dimensions then Illustrator assumes that 72 pixels are 1 inch and will place the image with that size at 100% scale. For example if the image is with 720 x 720 pixels, Illustrator will show it as 10 x 10 inches at 100% scale.
With work for the web you are most interested in the pixel size of the images and objects. Change the units in File > Document Setup to Pixels. But have in mind that these are 72 pixels occupying one inch on the ruler in Illustrator and not the pixel resolution of the linked images. So, the Transform palette showing the selected images or objects with pixel dimensions will matter if you save for the web or export to a raster image file format where you can specify the pixel dimensions of the image. The pixel dimensions in Illustrator will not matter at all if you print the illustrator file in which case the resolution of the linked images will be used - not the pixel space they occupy in Illustrator. But for the Web all that matters is the pixel dimensions in Illustrator. So if you want the ppi (pixels per inch) in Illustrator to match the actual ppi resolutions of the placed images (links), you have to save all images from Photoshop as 72 ppi or remove their metadata. This will ensure that no resampling occurs when you save images at 100% scale from illustrator for the web .
In Photoshop you can use its automatd batch processing features to change quickly the ppi of multiple images.
As for the resampling of the scaled images I believe Illustrator and Photoshop use the same algorithms
Message was edited by: emil emil for clarity and fixing spelling

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