Question about Canon EOS 400D / Rebel XTi Digital Camera

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Changing the resolution on my camera before i go to photoshop

I understand  that when i go into photoshop it says 72 resolution and i change it to 300 so i can get a perfect 11x7 picture or what not. . . I dont know how to change it on my camera to a higher resolution so I can make HUGE PRINTS!  I have a canon rebel xt  and i am hoping to make picture 20x20 (maybe even higher if it lets me) with still a good resolution

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  • campis1 Sep 09, 2008

    I have the same problem, I don't know how to change my camera settings so my photos will be at 72dpi when I open them in PhotoShop.

  • Anonymous Oct 25, 2008

    I have the same problem on my canon eos 1000d. i can not change the resolution up to 300 on my camera.

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Using the RAW setting will give a higher quality photo, the other formats compress to jpeg causing you to loose some of the original photo information. the ZoomBrowser EX program allows you to edit the RAW image, I recommend getting the large prints done at Kinkos or some place like that. I've gotten poster size prints done that look very clear. Use a tripod to combat camera shake, it is very apperent at that size of print. Also a low ISO to help reduce noise.

Posted on Sep 11, 2008

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You can't adjust DPI on a camera. You can adjust pixel count. In your manual on page 60 it tells you how to set image quality. Looks like the "L" setting will produce somewhere in the 16.5x11.7in paper size. To change DPI that is done in your editing software on your computer such as Photoshop. If you use photoshop, find your manual and read it. If you take it somewhere to be printed tell them what you want and they should know what they are doing.

Posted on Dec 04, 2008

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As far as I know it is not possible to change the actual dpi on the camera, make sure that the megapixle count is set as high as you can on the camera.
You should be able to enlarge the photo on the computer at 300dpi, up to about 400% (using bicubic resize). 

Posted on Sep 10, 2008

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My pictures are only 72 DPI. How can I change the resolution to higher quality?


The dots per inch setting (DPI) is meaningful only when printing the picture. As such, the camera simply fills in a default value of 72. You can change it in Photoshop or any other photo editing program. The resolution setting on the camera only changes the number of pixels in the picture, not how you print it.

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Hi - When talking about resolution in digital photography there are two main meanings.
One is the "pixel count resolution" and the other "embedded resolution". So for example your camera could record 2272*1704 as the actual pixel count resolution and set 72 as the embedded resolution that tells other software (for example photoshop) what the intended use of the picture will be. 72 ppi is the default for web pictures. You can change this in photoshop by going to the "Image" tab & select image size. The window that opens will show you the pixel dimensions i.e. pixel count resolution and the document size & resolution 72. You just change it in your software to 300 for printing. In Photoshop you can change the default to 300 by going "edit", "preferences", "units & rulers" and setting the values for "new document preset resolutions".

So for your camera the embedded resolution is 180 which you can only change in your PC software.

This is a complex subject, I recommend looking at the following web page:

http://www.fotofinish.com/resources/centers/photo/resolution.htm

Please take a moment to rate this solution & let us know if the information given was useful to you - Good Luck!

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1 Answer

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2 x 4 ft. is 24 x 48 inches, so you have to cover 1152 sq. inches using 12.5 million pixels.

Spreading 12.5 million pixels over 1152 sq. inches means 10,850 pixels per sq. inch. Taking the square root gives you a maximium resolution of 104 pixels per inch (or 'dpi')

Photoshop will allow you to increase the resolution by a process known as 'interpolation' .. increasing to 300 dpi using Photoshop before printing will give a better result.

NB. Depending on your printing process, you may end up dealing with files up to 500Mb in size ....

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