Then all that would be necessary would be to drop the file to 180 dpi just before printing.
Is this logical or just nerdish nonsense!?
I could experiment to find the answer here but why reinvent the wheel (unless I have to!).
Jonathan:
By keeping to an even division of 720, you don't force the Epson RIP to interpolate the image an additional time. If you can't see a difference at 180 for that image, then go for it. The print times will be considerably shorter. I typically go for 240 ppi, with prints smaller than 11 x 14 inches as this covers a wider variety of situations.
However, I will point out that there are images where 180 may be too low. IMHO, the "telltale" signs will appear most quickly when you are dealing with "highly detailed" images, especially those that contain "hard edges" (rapid transitions) at an angle to the image. For example, architectural images with an edge of a building at a 30 or 45 degree angle will exhibit "stair-stepping" at lower resolutions more quickly than at higher resolutions. If there is a heavy application of USM (unsharp mask) this "stair-stepping" may become quite pronounced.
If the image is a rather "soft-focus" close-up of a face, then lower resolutions should not be a problem.
The other major factor is the size of the print and it's relative "viewing distance."
Larger prints, viewed more distantly do not require as high a resolution. Smaller prints that might be viewed from a few inches (centimeters) away may require higher resolution.
David
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David Riecks (that's "i" before "e", but the "e" is silent)
http://www.riecks.com , Chicago Midwest ASMP member
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