Regarding Nikon D300 PPI Value!!!

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Postby Salil Sahani » Mon Jun 28, 2010 4:44 am

Hello Everyone,

Can Anyone Tell Me especially Scott and anyone using Nikon D300 Is 240 the set Value for PPI ? I Mean when We take Photos In RAW on D300 In Adobe Bridge and PS It shows the Value as 240

Can We change this value to 300 ? If Not then If after editing the Photo at 240 PPI if I Save the Image as a Tiff File Cropped at 300 PPI Will it After to overall Photo Quality For Good or for Worse ?

Thankyou
Salil S Sahani
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Postby tswinner » Mon Jun 28, 2010 10:31 pm

Hi Salil,

Changing the ppi has no affect on the image quality unless you up-res / down-res or resample the image.
It will affect a print though. The overall pixel dimensions will give you a better idea of how large you can print an image.

Todd
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Postby Salil Sahani » Tue Jun 29, 2010 1:11 am

Thankyou Sir

When can You say that the Image is Up Res or down Res or Resampled ?

I Am Really Sorry But I Am Not At All a Technically Sound Person So.......
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Postby tswinner » Wed Jun 30, 2010 10:57 am

ok lets say you have a 3840 x 2880 image at 240 ppi that would give you an output size of 16" x 12"

if you change the ppi to 300 without resampling you still have a 3840 x 2880 image but your output size is now 12" x 9.6"

If you did need to resample because someone required a 16" x 12" file at 300 ppi you could do so but you would now be modifying the file you would end up with a 4800 x 3600 file

In general you should never upres / resample your images unless you need to for a particular size or output.

Todd
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Postby scottg » Thu Jul 01, 2010 4:31 pm

I really don't pay any attention to PPI. It doesn't affect anything on the screen, and when I have to print something I just tell me printer how large of a print I want and they automatically calculate the proper PPI on their end.

>> Can Anyone Tell Me especially Scott

hey, I don't always have all the answers! :) there's lots of other smart people here, we can all learn from each other

Scott Gietler Owner/Editor, Underwater Photography Guide & Bluewater Photo http://www.uwphotographyguide.com http://www.bluewaterphotostore.com

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Postby bvanant » Thu Jul 01, 2010 10:01 pm

To put it simply, your camera takes a raw picture at 4288 x 2488 pixels which multiplied together is 12, 212,224 pixels or 12 MP. This is how many pixels are in a raw photograph. In your computer software it is set up to show the picture at 240 pixels per inch or 17.8 x 10.3 inches. If you set your software up to show pictures at 360 ppi resolution you will get a picture that is 11.9 inches x 6.9 inches. Same number of pixels, same amount of information in the picture just smaller on the screen with better resolution. None of this matters, except when you want to make a print. Most printers like resolution at 300 or 360 ppi and so with the picture you have you could make a picture at 17.8 x 10.3 inches with 240 ppi or one at 12 x 7 inches at 360 ppi. The smaller print would look a bit better since the resolution is a bit better but both have the same number of pixels.

Do this experiment. Open photoshop (or whatever you use) and look at your 240 ppi picture at 100 resolution. Then change the picture size to 360 ppi and look again. What did you see?

Bill

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Postby Salil Sahani » Fri Jul 02, 2010 4:13 am

Thankyou Todd, Scott and Bill

:) Yeah I Know What I Meant was Anyone Using D300 :)

I know for Sure that You do Scott thats why

Dont know who else does so..... :)

Thankyou All of You :)
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