: What DPI/PPI should a 4 by 6 meter outdoor billboard be designed at? I'm creating a 4 x 6 meter (~13 x 20 feet) outdoor billboard advertisement that includes an image and vector logo (rasterized)

@Jennifer810

Well, where I come from 400x600cm is 4x6 meters. :-)

30 dpi for final output is more than enough for a billboard of that size. It's not unusual for final output to be 12-15 dpi in this context.

The usual professional billboard workflow in Photoshop is to build the image at a small scale with high ppi (e.g., 4x6cm @ 300 ppi), but in this case you can work full scale because you're not exceeding any of Photoshop dimension limits.

What you really must do, though, is to contact the billboard company. Either their website or their production department will give you their exact requirements for file size and format. They will have Photoshop and/or InDesign templates that not only give you the dimensions you need, but the correct color profile. Use the template.

Added note: I've moved my billboard workflow to InDesign these days, and send to the provider as PDF. If you have ID CS5 I highly recommend that, for speed of production, accuracy and vastly better typographic control.

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