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Forget the 300 dpi/150 lpi ruleA 150 lpi screening means that 150 dots are printed per inch in both the horizontal and vertical axes. Likewise, a 300 dpi resolution means that there are 300 x 300 pixels in one square inch.Doubling the resolution means that the RIP has to calculate an average of 4 pixels to create every screen dot. Since binuscan IPM performs this operation when it re-calculates images, only 200 dpi are required for a 175 or 150 lpi screening. Two hundred dpi is the adequate resolution because, in order to achieve higher quality, the IPM bases its sharpening directly on the screen dot, not the pixels used to create the dot. At 200 dpi the filesize of the image is half that of 300 dpi and, consequently, is transferred twice as fast and ripped four times faster, producing even better quality. Optical resolutions needed for various Paper sizes and slides in order to print a 200dpi image file (150 or 175lpi) |
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| Paper formats | A6 | A5 | US Letter | A4 | A3 | A2 | A1 | A0 |
|---|---|---|---|---|---|---|---|---|
| Dimensions(cm) | 10.5x14.8 | 14.8x21 | 8'1/2 x 11 | 21x29.7 | 29.7x42 | 42x59.4 | 59.4x84 | 84x118 |
| 24x36 mm original | 825 | 1167 | 1800 | 1650 | 2333 | 3300 | 4666 | 6600 |
| 6.0x6.0 cm original | 495 | 700 | 932 | 990 | 1400 | 1980 | 2800 | 3960 |
| 4'x5' original | 234 | 331 | 440 | 468 | 661 | 936 | 1322 | 1872 |
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