Poster Size Resolution

[MikeMcMahan]

I have a Sony Alpha 10.2 megapixel camera that has a maximum image size of 3872 x 2592 pixels. If I take a full frame without cropping, using a tripod and high shutter speed, what would be a reasonable size enlargement before I get pixelation? How many pixels per inch on the final image starts showing pixilation? A 16 x 24 inch would be greater than 150 PPI. Is that sufficient? Can I go to 20 x 30?

[OsmosisStudios]

I've done 24x36" prints with a 10.2MP image (from a D80: ostensibly the same sensor). Not had a problem with it.

If you're concerned, stick to a 16x20 or similar size.

[Sterling]

What is acceptable depends on the expected viewing distance. Ever looked at a highway billboard up close?

[MikeMcMahan]

Yes I have and I totally agree. I am just trying to determine some rules of thumb before doing trial and error on poster size prints.

[audiman90]

You can always try increasing the image size by increasing the number of pixels in something like photoshop. I have enlarged 3meg images to 30 x 20 ins with no loss of definition.

[OsmosisStudios]

Originally Posted by audiman90

You can always try increasing the image size by increasing the number of pixels in something like photoshop. I have enlarged 3meg images to 30 x 20 ins with no loss of definition.

Shenanigans.

General rule: 100px for every inch of print, ABSOLUTE minimum. Preferably twice that.