ToddSchumacher
I like to draw!
2WS-Steve said:
That's interesting; the printers I've been working with request 300 dpi images for grayscale and color and say that their half-tones are typically done at 300 lpi (I think). Is it two different resolutions, one for the text and one for the images?
OK... Greyscale images and most interior illustrations are OK at 300dpi resolution scanning wise..as long as you scan them at 100% the size you want them in the book. Line art and text (Especially text) pretty much need as much reslolution as you can muster. (line art is 800dpi minimum). I've been on projects where art for the cover was sent out to a place with a drum scanner that could get a really good high res-12-24dpi resolution.
LPI is a standard for measuring halftone 'screens'. Conventional printing is done with tiny-tiny cyan, magental, yellow and black dots all clumped together in different sized to make images.
DPI is used to measure 'dots per inch' and is a measurement of digital image stuff (computer screens -typically 72-100dpi, scanners, digital cameras, inkjet and laser printers all use that as a measurment of quality.
Comparing DPI and LPI is like comparing inches to degrees. Can't do it.
Getting a 300dpi image and a 600dpi image outputted to a film calibrated with a 300lpi screen will look pretty much the same..which is why printers don't recommend anything higher...it just wastes all that presious memory.
Text and line art (Vector art such as from illustrator...logo making) are made with a different format. They can have sharp edges without being memory hogs that raster images (pixels) are, but need the high dpi capable imagesetter (the equipment that makes films that are used to make plates).
Help a bit? Its been 2 years since I had to know all this stuff.