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Need help saving pictures so they can print in high resolution

http://www.flickr.com/photos/90773959@N05/8246411993/

 

I desperately need help figuring out what I am doing wrong.  I took pitcures for a family, and apparently the way I am saving the files isnt in a high enough resolution... They are telling me when they go to upload to a site to print a canvas 16x20 the resolution is grainy. 

My question are:

What files settings should I use to export using Lightroom?

Format, Color space,

Image size. What should I put for resolution? ppi?

 

Then, once I export them to save them, how can I be sure that what I put on a disc wont be compressed so when they try to upload they get the same issues?

 

I should mention the files started as the .NIF

 

 

 

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I have the same problem.. I hope someone can answer this.

The main problem is the size you want to print. Ideally, you want to have an image density of about 300 pixels per inch, and definately no less than 220 PPI. To get an image of 16x20, you would require 4800 by 6000 pixels, or a total of about 25 MILLION pixels, far above the ability of most cameras. Google print size vs resolution or pixels, and you will find charts of the maximum quality print size you can make for your camera. Also, if at all possible, shoot in RAW (NEF) and save your files as TIFF, so there will be no compression, which will further degrade your image.

set the camera to it's highest resolution, (you'll find it on the menu) if possible shoot in raw, edit in raw then convert to jpeg or as greg says TIFF also a side issue use the inks made for your printer, third party inks are less expensive but unreliable. good luck  : )

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