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elisabeth wrote:
You would not see any difference between 250-300 DPI in photoshop or PSP, because your monitor can't "read" more than 72-100 DPI. DPI is a printer format, meaning for printing it makes a difference if you make it 250 DPI or 300 DPI. 300 DPI is the standard for scrap-printing and 12x12 inch is the standard album size. Hence my humble request |
Yes I understand the difference between PPI and DPI. My point is that the PPI is then interpreted by your printer's RIP into the 300 DPI, 600 DPI or whatever resolution you choose to print at. This approach saves you from having to do an interpolated resizing in your image editor so no new and pixelated changes happen. Your RIP software now simply sees a 12" x 12" source image instead of a 10" x 10" image and proceeds to map the pixels for whatever print quality you select.
There are limits to how much resolution one can add with this approach but the small amount of enlargement in your example (120%) should be pretty much undetectable it you allow your printer software to do the work instead of your image editor. But don't believe me ... try it!
Next time you stand in front of a light box at someplace like an airport showing a clear, sharp image measured in double digit square footage, ask yourself how they were able to produce it. It wasn't from a source image measured in double digit square footage. Most wide format printing is done in the range of 72 to 100 PPI for the source image and the output DPI is set in the range of 720 to 1440 DPI. The results are beautiful.
Fred Weiss
Allied Computer Graphics, Inc.