 Stuart Barber |
Changing DPI of photo's Can someone tell me how or if I can change the DPI of shots, I am sending some to our Ad agency, they are currently 100dpi and the agency requiresthem in 300dpi, Many thanks in anticipation. regards Stuart.
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- Carolyn M. Fletcher  Contact Carolyn M. Fletcher Carolyn M. Fletcher's Gallery |
There's a really great thread on this. Check out the following: www.betterphoto.com/forms/qnaDetail.php?threadID=18761. This should answer all your questions.
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Michael H. Cothran |
Stuart, Assuming you have some version of Photoshop, it's quite easy. There are two different scenarios, and you did not mention which one you need, so here are both ways - 1. If you just need to resize your image to 300 ppi, then there is no problem, and you will experience NO image quality damage in doing so. With your file open, go to Images>Image Size. Then check Constrain Proportions, and UNcheck Resample Image. Then highlight the window box for Resolution, and type in 300. Your image will change to 300 "PPI" and your dimensions will change proportionately. 2. IF...and a really big IF here - IF you need to keep your image size the same, but increase the file size from 100 ppi to 300 ppi, then that's a different ballgame. If this is the case, then you want to check both Constrain Proportions AND Resample Image. This change will cause significant interpolation of your image to occur. "Interpolation" requires the system to ADD pixels in order to increase your file size. Adding these pixels will alter the appearance of your image negatively, and damage to some degree its quality.
If you have any questions or concerns, ask.
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Pete H |
Michael gave you some great advice. Also, when you "upsample", select "Bicubic Smoother" otherwise you will really see the interpolation errors when going up; esp if printed large.
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