How to set Canon T2i from 72 resolution to 300?

Question

I have an 18 MegaPixel Canon that takes amazing pictures, but when I check image properties on photoshop it shows the resolution as 72 ppi, I heard that 300 ppi is a lot clearer.
Note that I use a mac and run Photoshop CS3.

Thanks :)

Answer 1

You may not be able to change that in camera and if this is the case, it is not a problem, but if you can, I provided a link below that will let you download a pdf manual for the camera so you can see if the option is there.



If you can not change it in the camera then do this: Open an image file from your camera in Photoshop, then go to the very top menu in Photoshop, along that menu bar go to and click on "Image," then the drop down below "Image" has the "Image Size" option. Choose the "Image Size" option and the "Image Size" control window will come up, then in the lower left corner area there are 3 checkbox options, uncheck the "Resample Image" checkbox, this will connect the Width, Height, and Resolution and then you can just change the resolution to 300 pixels/inch (dpi) and the software will properly adjust the Width and Height.



For example, my camera often captures images at 240dpi at 11 by 16 inches, and when I change it to 300dpi, it becomes about a 8.5 by 13 inch image.



It is the same amount of information utilized differently. It is common for cameras (especially in a jpeg mode) to shoot and store an image file at 72 dpi but with bigger dimensions.



Hope this helps.



Mark

Answer 2

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Answer 3

All that long winded stuff already posted aside, the answer is that YOU DON'T set anything of the sort on the camera. No matter what resolution you shoot with on the camera, be it 640x480 to 18mp, Photoshop will tell you the image is 72dpi. It makes absolutely no difference at all what that number shows in Photoshop. It can be 2, 72, or 720. The number is there to confuse the crap out of people, and that's about it.



The only time such a number means anything is when you are printing. It has absolutely nothing to do with how an image displays on a screen. You can set it to any number you want, the image will still look the same on screen. Try it yourself and see.

Answer 4

Actually, you can't change the output resolution of the photo as it come from the camera. ALL jpeg output from Canon DSLRs is set by the factory at 72ppi regardless of the overall file size or quality settings others are telling you to change. Changing the ppi of the file will have no impact in how the images look on your screen but has everything to do with the output size of these images when you print them. That said, you can change the ppi of files from within CS3.



In CS3, go to Image, Image Size. Uncheck the box next to "Resample Image." (This lets you change the ppi and therefore the native print size without loosing pixels). Change the resolution from 72ppi to 300ppi. You'll note that the document size reported in inches will shrink from 52x78 inches to about 12.5x18.75 inches (it's actually a little less than that) when you do this. Click OK and then save/close the document to make the changes permanent.



Having said all this, you could shoot RAW which embeds no specifc ppi into the resulting file. The ppi is set by your RAW converter when you convert to JPEG or TIFF for printing/editing. ACR or Adobe Camera Raw in CS3/CS4 defaults to 240ppi but you can set it to whatever you want. Canon's Digital Photo Professional or DPP on the other hand, defaults to 350ppi and again, you can change this setting. If you open 8-bit or 16-bit TIFF files generated in either application, you'll see no difference in resolution as these files appear on your screen. The difference is going to be seen in the native size of final print output unless you resize the image. You may find that you like the tone mapping of DPP verus ACR or vice versa but, the actual resolution is something you set in the preferences of eitherr application according to how you'll ultimately use the file.



In my case, I set my files destined for printing at 250ppi because that's the setting recommended by the folks I use for printing (MPix). All the files I intend to use on the web are set to 72ppi which is generally optimal for viewing on a computer screen or even those small digital photo frames that have become popular in recent years.

Answer 5

There's rarely any point in shooting at a lower resolution than the camera can offer. If you want an image that is 1056x704, by all means shoot it at the full 18 megapixels, and then crop it on the computer afterwards. If you don't have a program that can crop accurately (like Photoshop), go download GIMP. It's free. Good luck!

Answer 6

I will handle your question about how to change the ppi/dpi on your camera first but please continue reading as to why this setting may not provide you the expected increase in quality you may be looking for. You can see at the first link in the Source section the same picture taken with the same camera with different ppi/dpi settings. See if you can tell the difference.



As for changing the dpi/ppi on your Canon T2i. Your camera has quality settings which allow you to set resolution and dpi/ppi in one step. Unfortunately this camera does not let you set dpi/ppi directly but allows you to select from a preset number of settings. Please see page 75 of the manual for this camera for an easy explanation of how to do this as the symbols used on the camera and in the manual cannot be reproduced here and my explanation of what they look like would probably only confuse matters. I will say that the RAW setting will provide you with the maximum dpi/ppi this camera is capable of producing files in (which is 240, not 300). But you will need to process the RAW output with your Photoshop program to produce a file capable of being emailed and displayed in other programs.



The manual is here: http://gdlp01.c-wss.com/gds/9/0300003169/01/eosrt2i-eos550d-im-en.pdf



In my experience shooting digitally, ppi/dpi is less of a concern than overall resolution. If you are using your camera to produce images for display on your (or someone elses) computer monitor, regardless of the dpi/ppi listed in the graphics file your camera produces, you will only get the quality that the monitor is capable of display. Even if you are printing out one of your pictures, the ppi/dpi setting listed in your graphics file is going to be over ridden by the program you use to print it with as it will have to resize the picture to fit on the paper your printer uses (i.e. 8.5"x11", 9.0"x12", etc)



Please see the larry-bolch.com lay-man's explanation of ppi/dpi and why it isn't as important as resolution. The link is in my Source section.

Answer 7

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Answer 8

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Use the software bundled with your camera to convert the 2592x1728 into any resolution you want. Digital Photo Pro is the one you want

Answer 9

Check your manual for the menu settings you need to set your camera to full resolution.