Hey thanks!
Yeah, I'm aware of this, but what is throwing me off, is when I shot with my 5700, on the high setting it was showing xxxxbyxxxx @ 300 DPI (in Photoshop), and on the lower setting it was showing xxxxbyxxxx @ 72 DPI for the same image. This is what is confusing me. If this can be explained, then please, by all means do so.
However, back to 30D.
So, Yes or No, you CANNOT shoot 3504 x 2336 @ 300 DPI? Everything you shoot is at 72 DPI (as per Photoshop)?
Thanks.
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In answer to your YES/NO question: NO, you cannot change the in-camera setting that is put on your 3504x2336 image.
This setting does not affect the image in any way. The dpi only means something when you want to print or display the same pixels. ( If you don't want to capture all the pixels, you can change the large/fine to other , smaller sizes )
Think about why you care about the dpi!
As explained, it does not affect the number of pixels or the quality of the image, only what size it will be printed/viewed at. On your 5700, the values of the xxxx's in your post are very important to the issue that confuses you. I've not used that specific camera, but consider the following : an 8"x12" print at 72 ppi is 576x864 pixels; and an 8x12 print at 300 ppi 2400x3600 pixels. The first is much lower "quality/resolution" than the second one, and that's probably what happened on you camera - they confused you into thinking that low ppi is bad and high ppi is good. That is true only if the size remains fixed, as in the 8x12 example.
In Photoshop - where you are told the image is at 72 ppi - you can magically change this to 300 ppi without touching the data : Go to Image/Image size - then UNCHECK the "Resample image" button and type in 300 where it says 72 in the Resolution box. You will see that the number of pixels does not change but the resolution has "jumped" from 72 to 300. What HAS also changed is the physical size of the image. In jargon terms, the "72 ppi" or "300 ppi" designation is only a tag associated with the data for the pixels in the image.
Hope that helps a bit
Andy