Don't go overboard when specifing bitmap resolution for large format printing.
For magazines and other print jobs a bitmap resolution of around 300 pixels per inch is a typical rule of thumb, but this is for something viewed at no more than arms length.
One larger, screen print job I have did was designed to be viewed from at least 10 feet away and at this distance you can drop the resolution, you will need to experiment, but I got good results with bitmaps at 120 pixels per inch.
Note these are for 'photograph' type bitmaps.
For 'clean' lines in logos they should be created as a vector graphic that, as has been mentioned already, scales to the resolution of the print device, if output correctly.
HTH
Peter
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