Ques. @ DPI

[mudgirl75]

I am shooting JPEG with a Canon T1i at the largest and fine setting. When I open the photos in Photoshop the size is 3000 X 2000 pixels but only at 72 dpi. I can change the dpi to 300 but it shrinks the size of the image. What do I need to do to get a 300 dpi image straight out of the camera. Any help with this question would be greatly appreciated. Thank you!

[dcclark]

The "DPI" setting is basically meaningless. All it is is a number stored in the file -- it doesn't affect the size (in pixels) of the image at all. Is there a reason that you want to set the DPI?

If you print through an online service, they don't even pay attention to the DPI setting. You choose the image size, and they squeeze your pixels into that print size -- regardless of the DPI setting.

[ciraxis]

shooting raw will be the fastest way

[dcclark]

Originally Posted by ciraxis

shooting raw will be the fastest way

How would that affect DPI?

[teaking]

DcClark I think you are right on this one, its a topic that does pop up from time to time people feel there images may not be full quality. And im with you on the RAW DPI front to

All that matters is the pixel Width and Height the physical print size effects the final DPI.

If there is a reason you need your images at a certain DPI (or PPI) then you can do a bit of math and work out the pixel width and height you would require to achieve 300 DPI for the physical print size and then interpolate (resize the image). Usualy up to 200% theres not alot of difference in interpolation methods as long as theres plenty of detail to start with and photoshops Bi Cubic resizing giving good results.

Sorry didnt mean to waffel lol just put the last part in in case there was a real reason for getting 300 DPI

[natek313]

Originally Posted by mudgirl75

I am shooting JPEG with a Canon T1i at the largest and fine setting. When I open the photos in Photoshop the size is 3000 X 2000 pixels but only at 72 dpi. I can change the dpi to 300 but it shrinks the size of the image. What do I need to do to get a 300 dpi image straight out of the camera. Any help with this question would be greatly appreciated. Thank you!

As dcclark said, dpi is pretty meaningless unless you're going to be printing your photos through a printing service. Even then, they usually specify a minimum resolution (height x width; in pixels) for a given print size.

[OsmosisStudios]

Originally Posted by dcclark

How would that affect DPI?

You can set the DPI resolution as well as the pixel resolution in most RAW converters. This is only of use if you ever need to submit something to a print house, as mentionned, because they'll likely be printing at 300dpi.

[sk66]

I don't think DPI "affects" anything. I've always understood DPI to be a "printer setting" and PPI and image size setting. I *think* DPI might matter if you have a printer which will read the file and automatically print it according to it's exif. Pro printers do not.

[dcclark]

Originally Posted by sk66

I don't think DPI "affects" anything. I've always understood DPI to be a "printer setting" and PPI and image size setting. I *think* DPI might matter if you have a printer which will read the file and automatically print it according to it's exif. Pro printers do not.

The danger with "setting" the DPI in software, is that you can end up up-sampling your image. Photoshop will gladly invent data (interpolated from your existing pixels) if you ask for a high DPI, and have the "resample" box checked. That can look very funky.

[sk66]

Originally Posted by dcclark

The danger with "setting" the DPI in software, is that you can end up up-sampling your image. Photoshop will gladly invent data (interpolated from your existing pixels) if you ask for a high DPI, and have the "resample" box checked. That can look very funky.

Yes, but photoshop uses PPI not DPI. I do believe there is a technical difference. But looking at the OP, PPI was probably what was really meant to start with.