opening digital pictures

I have a question about opening my digital pictures in photoshop. I shoot at
7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the
image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x
7. My question is how large of an image can I get at 350 dpi? If I type in
350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can't change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn't. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.
Thanks, Tammy

"Shayne & Tammy Cunnington" wrote in message

I have a question about opening my digital pictures in photoshop. I shoot at 7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x 7. My question is how large of an image can I get at 350 dpi? If I type in 350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can't change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn't. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.
Thanks, Tammy

to leave the file size alone untickt he resample box in image size dialog the actual file size will match
and you willnot be addingor subtracting any pixels

if you need to make a larger picture click resample
the program will interpolate by adding in pixels

On Wed, 20 Feb 2008 16:36:37 -0500, "Shayne & Tammy Cunnington" wrote:

I have a question about opening my digital pictures in photoshop. I shoot at
7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the
image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x
7. My question is how large of an image can I get at 350 dpi? If I type in
350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can't change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn't. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.

Until you print an image DPI (or PPI) is MEANINGLESS. And I mean physically print.

DPI = pixels horizontally
-------------------
physical print size

See also:

http://www.ransen.com/Articles/DPI/Default.htm

Easy to use graphics effects:
http://www.ransen.com/

Shayne & Tammy Cunnington wrote:

I have a question about opening my digital pictures in photoshop. I shoot at
7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the
image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x
7. My question is how large of an image can I get at 350 dpi? If I type in
350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can't change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn't. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.

Uncheck the 'Resample Image' checkbox at the bottom of the dialog window.

--
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com