DPI 72 need 400

I new here a trying to do some poster prints by photos are comming out at 72 DPI and was told that they need to be 400 DPI need help i dont now what to do

is there a spot on the XTI to change these or is that what it is i dont what to do

You cannot change that in camera, but you can in post processing.
Which photo editing program do you use?

i use photo shop and jasc and use that to go to 400DPI but did not look go on a poster size

Open your photo in Photoshop, click on Image, click on Image Size…
Remove the check mark from Resample Image.
In Resolution: field change value from 72 to 400.
Note how values in Width: and Height: go down.
Image size will be smaller at higher resolution.

Btw, you have to worry about resolution only if you have to print your photos yourself.
For everything else, it’s meaningless.

Ups, I just realized that you were talking about DPI (dots per inch), and I was talking about PPI (pixels per inch)!
Sorry about that, they are two different animals.

DPI is set in your printer software and it has much bigger values.

It's hard to help without knowing exactly what you plan to do...

DPI or more correctly pixels per inch (PPI) is nothing more than the pixels in your image divided by the number of inches of paper you plan to spread them across.

So if you wanted to print a 24" X 18" poster at 400 DPI, then you must have an image file that is 9600 X 7200

-24 inches with 400 pixels on every inch = 24 x 400 = 9600 pixels

-18 inches with 400 pixels on every inch = 18 x 400 = 7200 pixels

If you don't have enough pixels in your file, then you need to go into photo shop and set the size (in inches), then set the PPI to 400.. Then make sure the 'Resample image' square is ticked.

Thanks i think sounds good i will try but is a a camera that is set to do poster size prints to make these a lot faster and easy

Tim 400D wrote in post #3937898
Thanks i think sounds good i will try but is a a camera that is set to do poster size prints to make these a lot faster and easy

Just to add.. The DPI attached to the camera images is meaningless.

It's just a value that's plugged in because it needs to be there. The DPI doesn't 'happen' until you actually print the image on paper. The DPI is the pixels divided by the inches... Since Canon has no idea how big the images will be printed, they can't really give you a 'best' DPI.

Tim 400D wrote in post #3937729
I new here a trying to do some poster prints by photos are comming out at 72 DPI and was told that they need to be 400 DPI need help i dont now what to do

Both me and my wife work with professional printers for brochures, posters, billboards, ads for newspapers and magazines etc and they need images to size at anywhere between 300 and 600 DPI. You can change it in photoshop but its not doing anything but increasing file size not image quality. You can use a program like Genuine Fractals that can increase file size without much loss to image quality.