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Increasing resolution for printout?

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Old 07-08-2009, 09:07 PM
groovigyrl groovigyrl is offline
Join Date: Feb 2008
Posts: 42
Increasing resolution for printout?

...a bad idea??

I've decided to enter the world of stock photography and sell my photos as greeting cards, etc. on various websites. Unfortunately, I've saved my images to jpg at 150 PPI. I hope I'm correct when saying PPI and not DPI. If not, please feel free to correct me. I see that most sites require 300 for quality printing. I have several that I took in RAW but of course, I converted to jpg with the lower res, without thinking about how I might use them in the future. I have spent hours in PS editing pics to get them exactly how I want them. I'm quite the perfectionist and it's not always the greatest quality to have. I absolutely hate the thought of starting over!

I'd like to know if I can increase the resolution rather than starting from scratch. I understand that I will lose quality (some sites say they will reject them if res is increased the quality suffers) but I'm only taking it up from 150 to 300. Will it make a noticeable difference?

I have Photoshop CS4 and wonder if anyone can tell me about the bicubic smoother and if this is the way to go. I have yet to read up on it but see that it is an option. I also get a little confused about the cropping size. I've been cropping my pics as 5X7s mostly, but some as 4X6s and 8X10s, depending on the composition. What is the best size that gives the best quality for printing?

Thanks so much. I always appreciate your help and advice!!

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