72ppi is Adobe's quirky way of saying a document has no resolution. I realize this can be confusing, but you must remember that Illustrator is a vector image editor, and technically vector documents have no resolution as such. It is measured in ppi (pixels per inch), otherwise known as dpi (dots. What you changed was only the setting for Illustrator's "raster effects". Image resolution is one of the most important aspects of your mechanical.
* Note: You can't change the document resolution in Illustrator. Now if we have a raster image with the same pixel dimensions, but set at 300dpi, you can work out the physical dimensionsĪs you can see, although the raster image is the same size as the AI document, it will be considerably smaller when placed in Illustrator, since Illustrator will scale the image using the ppi/dpi setting. Here's how you work out the physical dimensions of the AI document All Illustrator documents are 72ppi, this is a default that cannot be changed*. Let's say you have an AI document like my example which is 1400px x 700px. So, with that in mind, if you do some simple arithmetic you can see exactly why the problem is happening. Please check the document info panel for embedded images to confirm what dimensions and resolution your photomicrographs are displaying at. In print documents, it's important that an image with a 300dpi setting is placed at the correct physical size, otherwise it will not print at the correct quality. The default normal in AI is that there are 72 pixels per inch, but if your image has dimensions embedded in it, it will open at that size (even if they are not accurate). This approach is also limited to three options for PPI (72 ppi, 150 ppi, and 300 ppi). Illustrator is a vector image editor primarily designed for use in print. One option is to create a new document and set the right DPI ( New Document > Advanced > Raster Effect ), but this means setting up your artboards again, copying the artwork across, and scaling it for the new size. If you are wondering why this happens, it's because Illustrator uses the PPI setting as a scale factor when placing raster images.
by 88.1279 points Resolution : 999.997 by 1000 pixels per inch Document. This is a 1400px x 700px AI document, with a 1400px x 700px image at 72ppi. Document hro Linked Images : os x : Users pbauer Documents : SEU A110 : App - C. Now place the image in Illustrator on an artboard with the same pixel dimensions, and it will match the size. It's important not to resample, otherwise you will change the number of pixels. Open the raster image in Photoshop, do Image > Image Size, then change the resolution to 72ppi, with the resampling option unchecked, and then resave it. I can see it in the image properties you posted.
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