On Tuesday, March 18, 2003, at 12:28 PM, David Townend wrote:
Dear List,Hello David
I'm in a tight spot and would appreciate advice : I shot a commission for a
client on a D100. Before the shoot the client briefed me that the final
image size to be used was "postage stamp", so I shot in high quality jpeg
mode to speed up the writing file to disk speed. At that size I reckoned any
jpeg artifacting would be lost in the final repro.
Any suggestions as to the best way to interpolate up in these circumstances
would be most appreciated.
many thanks, David
Here are a couple of thoughts for you. First I would try adding a bit of monochrome noise (ie grain shock horror) to the image before up-sizing, this will help disguise some of the artifacts. For upsizing I find that 10% increments in PS (bicubic) works as well as other methods,but see Stephen Marsh's excellent post on the subject entitled " Interpolation Progs suc has Genuine Fractals...." a couple of days ago.
One other thought; see if you can find out the exact line screen being used to print the final piece, I have found that 300ppi is excessive in most cases and that 1.5 times line screen (ie 225 ppi for a 150 line screen) will do an excellent job (client may take some convincing). If you uncheck resample and change the ppi to 225 (say) your file will grow in output size to start with which will help.
Hope that helps regards Nick tresidder
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