Saving to 300 dpi but when I reopen it is back to 240 dpi

I am doing this in image size but the changes are not staying when I reopen. What am I doing wrong?
Thank you
Melissa

Hi Melissa.
In the beginning, there are pixels. Period. Not pixels per anything. The number of pixels you start with is determined by your camera. If my camera sensor array is 3000 pixels by 2000 pixels, it is a 6 megapixel camera. The resolution, or pixels per inch, is an arbitrary assignment of those pixels when rendered.
Doing simple math, our 6 mp image will display at 41.66 inches by 27.77 inches on a 72 ppi computer image screen. If you assign it 300 ppi for printing, it will size out at 10x6.66 inches. But the point is, image size is a mathematical calculation base strictly on the number of pixels and the assigned ppi. Assuming you have unchecked Resample Image, which is highly recommended. In general, you don't want to resample your image. You don't want to create new pixels or throw away pixels, which is what resampling does. Unless your printer has indicated otherwise, 300 ppi is a suitable output resolution for most print work.
This is where dpi or dots per inch comes in. It is a printer specification. The printer will convert the ppi to dpi, according to its own logic. And as Kurt said, this is highly variable. But the 300 ppi rule of thumb is based on the way this conversion is made. 300 ppi converts gracefully from ppi to dpi for most print situations. This would include your clients printing from the CD to their own home printer.
Surprisingly, many pro printers aren't clear about the relationship between total pixels, ppi, and dpi. They aren't photographers. So they ask for a print specification, dpi. Not realizing all you can specify is the ppi.
Below, Resample Image is unchecked, as recommended. Changes made in the Document Size box will not change anything in the Pixel Dimensions box. This is good. Any changes made in the Document Size box does not change pixels. It assigns them a dimension. Changes made here will not change the way the image appears at Actual Pixels on your screen, because they are displayed at screen resolution (usually 72 or 96) no matter what ppi you have assigned. Changes in the Document Size box are nothing more than a set of calculations, and have no effect on the image at all. Until it it printed. Then the printer will take these calculations use them to do it's own, converting the assigned ppi to its native dpi. Or something like that.
You are not the first one to be confused by this. And may be more confused after my explanation. But there's tons of info about this on the web. Some of it makes sense. Good luck.
Peace,
Lee

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I do commerical graphics for many clients, and I usually start off with a new canvas of 1200x1200 px in 300 DPI..however, when I export or save for web & devices, the resolution changes usually to 150 or sometimes even to 72 DPI wether I'm saving in JPEG or PNG. I need these graphics in 300 dpi..
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...I usually start off with a new canvas of 1200x1200 px in 300 DPI...
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Suppose you have drawn a 4" x 4" rectangle on the empty page. You have then rasterized the rectangle at 300 ppi. Clearly, the raster image now contains 1200 x 1200 pixels. But the page rulers say it measures 288 pixels on a side. How can that be? Read on.
so a 1200 x 1200 pixel document at 300 ppi is 4 inches x 4 inches.
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Illustrator's "pixel" rulers are a complete sham. You can put a 1200 x 1200 pixel image on an Illustrator page and make it "measure" any number of sham "pixels" according to Illusrator's rulers you want. Therein lies the answer to your question:
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Better yet, don't use sham "pixels" as your ruler units at all. You want a 1200 x 1200 pixel raster image exported from Illustrator at a scale of 300 ppi, right?
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Create your artwork on the page. You can use raster images, text objects, vector objects, or any combination of those.
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File>Save For Web & Devices. The Save for Web & Devices dialog opens. Select the raster file type you want, either JPEG or PNG. Go to the Image Size tab. What do you see? Original Size and settings for New Size. Original Size is 288 x 288 pixels (See? Illustrator unyieldingly considers a pixel on its rulers to mean 1/72 inch). But you can enter 1200 x 1200 (or any other desired pixel count). Click Apply.
Save. Select Images Only.
Launch InDesign. Import the image. Note the size. (Does 16.666 ring a bell?) In the Scale X Percentage field, key "4 in". (That's right, key an absolute value into the percentage field.)
You now have a 1200 x 1200, 300ppi image. You did it using the Save For Web & Devices dialog. And you didn't even use Illustrator's ridiculous "pixel" rulers.
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