Dear Bob,
Can you expand on the meaning of "750mm deep"?
John
Dear John
The long side of the 1ds frame enlarged to 750mm. (Memory playing tricks. It was 776mm)
Actually I was doing a test of upsizing and included a very small section of the image on the test sheet. When I showed five photographers the results this week they were even impressed by the small section. If you missed what I posted a few weeks ago here it is again.
I enlarged the image in PS using 10% step interpolation and in GF. GF gave no appreciable gain over PS step so I abandoned it. I created an enlarged file of 515mm x 776mm at 300 dpi. I also tried enlarging in one step in PS and enlarging the original file to 225% in Indesign2.
Printing a small section side by side at 175lpi screen ruling I can see no discernible difference. What this means is that for litho print at this scale one doesn't need to use fancy interpolation methods. However, what is important in repro is the technique of sharpening. PS step and GF create a "smoother" image which can be used with some selective sharpening techniques to improve the way in which sharpening works on an image. But there are other sharpening techniques which can get close. If I were doing enlarged prints for display using an inkjet I would probably do step interpolation
Bob
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