Document Dimensions in Cs3 - please help!

[alan.ang]

hey everyone, i am working in cs3 and am having problems with my document dimensions.

im working on a logo which has to be specific dimensions and resolution, so when i am in the initial document setup i set it to 750 x 500 and 300 dpi.
although, when i export it as a jpeg it becomes 3125 x 2083.

please help, is there anyway i can save this file in 750 x 500 dimensions while keeping the 300 dpi resolution?

[the_modelbase_guy]

The trouble lies in how each app interprets pixels. The quick answer is to save your Illustrator file as an ai file then launch PS and "open" the ai file. There you will encounter a dialog box that will allow you to resize the image and resolution as you need. Be sure to keep a working ai file as well just in cas you need to make changes. Good luck with your project.

[barcoder]

My best bet is that you have used points instead of pixels. Points are units that have been used widely with print-jobs. One point is aprx. 0,013inch, so 750pts is little bit over 10 inches and with resolution of 300ppi it is 3125 pixels.

[TORCH511]

Illustrator has no resolution, however when working with PIXELS it assumes 72ppi (screen resolution). So if you set up a document that is 750 x 500 pixels your document in inches is 10.416 x 6.94.

If you then export/rasterize that at 300dpi then your document will come out to... you guessed it 3125 x 2083.

When you export simply export at 72ppi and your image will come out correctly.

If you need an image at 750 x 500 pixels, then resolution is irrelavant, since resolution only serves to dictate how many pixels are within a given measurement. You could go into photoshop afterwards and resize your image (turn off resample) and change resolution which would change the physical size to 2.5 x 1.66 inches.

You could also change your image size in Illustrator to 2.5 x 1.6667 inches and then export at 300ppi, which would give you an image size desired at the correct resolution.

[Lukas Engqvist]

OK, orthodox speaking the vectors that are the base for the illustration doesn't but since effects have resoloution and document has resoloution on export and transparency flattening…*it is getting more frequent to have files with pixel based/rendered resoloutions.
So even if Illustrator is vector driven resolution is important to bear in mind. And if you have bitmap or rendered objects rescaling will change the resoloution sometimes resulting in ugly maths artifacts.

Note: Illustrator CS4 has done away with filters (wich we had till CS3) menu and now only has effects which are redndered on the fly!

nostalgia:
At 72ppi we get a very practical maths (using adobe points itroduced some 30 yars ago).
one inch is 72 points. One point is one screen pixel. This is how it was on mac monitors on the days of the DTP revolution start :). A 10 point text would be 10 pix etc and all was fine and you could measure 100% on the screen with a ruler. Now those days are long gone :) More flexibility gives rise to more complex maths but therea are still artifacts floating around.
One being the confusion of ppi and dpi. 300 dpi being the standard res of a LaserWriter and 300ppi the standard res of a photo to be imaged on a imagesetter @2400dpi oh the days when maths was simple:o