Changing dpi

[ScubaChick]

I am using an Olympus C5050 Zoom digital camera. I have taken images in the "Super High Quality" mode at 72 dpi, 2560 x 1920. I am using Adobe Photoshop for my editing. I am needing to get the photo to 300dpi at 8.5 x 11".

When I'm in Photoshop, I do the following:
1. Open Image Size
2. Uncheck the "Resample Image" box.
3. Change the resolution from 72 to 300 pixels/inch

When I do this, the document size then changes to 8.5 x 6.4". Is there anything else I can do? Or something that I need to do differently?

Thanks for any advice you may have!
Jennifer

[Chunk]

I don't know if it's the best method, but you could use the crop tool and set the height,width, and resolution as needed.

[drg]

If the goal is a 2550x3300 pixel image you will need to Resample to upsize the photo. So you don't want to Uncheck Resample.

Then of course you will need to sharpen the photo some as well.

300dpi is a designation for printing. You might search this site for various discussions on this topic.

[another view]

Hi - first off, the camera only records a certain number of pixels. This is the sensor's resolution in megapixels. 2560 x 1920 = 4,915,200 pixels which roughly equals five megapixels. The print resolution you'll get at this size is pretty close at about 232dpi (2560 pixels divided by 11" = 232dpi), so personally that's what I'd use. You could make the image larger in Photoshop to get a full 300dpi, which is making the file size larger. You're not adding resolution to do this - just adding pixels. You might see a difference between a 232dpi print at "native resolution" and an interpolated (fancy word for making the file size bigger) print at 300dpi. It's worth an experiment to see which is better, and this could vary from image to image.

The other thing is that the proportions aren't exactly 8.5 x 11 either unless you crop it a little bit. If you want a full-frame image, it will be 8.28 x 11. The difference might not seem like a big deal but if it was stretched on the width to get a full 8.5" then it would look a little wierd (as in fun-house mirrors...).