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LPI = Lines per Inch
It is a measure of the fineness or coarseness of the screening in photographs and tints in a printed piece. The term comes from back when we halftoned images by photographing them through screens, which are pieces of film with a pattern of dots on them--you measured off an inch and counted the number of dots in a straight line. Or, actually, someone at the screen factory did it; they were marked, so if you wanted a 133-line screen you just took it out of the box--which you ALWAYS put it back in after you were done using it, because they scratch easily and they're hundreds of dollars each. You can still get these, by the way--people still shoot halftones on cameras.
Four things go into determining your linescreen: the reproduction process, substrate, prepress imaging device and source image all play a role.
As to the reproduction process, some ways to print will "hold" a higher linescreen than others. Offset's higher than flexo which is higher than screenprinting.
The substrate is what the product is being printed on. If you're running on Kromekote, which is a paper with a mirrorlike surface that really doesn't absorb ink, you can get a far higher LPI than if you're running on a cotton t-shirt.
The prepress imaging device is obviously important, and here's how you calculate the maximum screen frequency you can get out of it: divide the resolution you're using by 15. A dot in a digital halftone screen is made of a group of device dots (aka a "supercell") and you need 100 device dots per supercell so you can get all the dot percentages from 1% to 100%. You need to have more dots per cell available because not all dots are the same shape--some run up-and-down, some side-to-side--so we've found a supercell that's 15 dots square, or some multiple thereof, works well. So...if you have a 2400dpi or 2540dpi imager, you can get a smooth 150-line screen out of it.
And for the source image...the rule of thumb here is, "maximum LPI is one-half the DPI." In other words, a 300dpi image gives a good 150-line screen.
The resolution of certain output (and input) devices is sometimes defined in LPI
What else can I help you with?
When was LPI Media created?
LPI Media was created in 1997.
What is LPI in NDT?
Liquid Penetrant Inspection
Define and explain LPI in terms of pre press?
LPI Stands for "Lines per inch". The number of lines printed in a Vertical inch. The offset Printing lines per inch in a halftone or line screen. LPI is a measure of the fineness or the coarseness of the screening in photographs and tints in a printed piece.
How would you change the scanner settings for two different printing process or electronic media?
When we're scanning for newspaper image, the resolution will be 85 - 100 lpi; and for magazine, the resolution should be 133-200 lpi.
What is lpi screening in pcb?
LPI screening in PCB (Printed Circuit Board) refers to the process of applying Liquid Photoimageable (LPI) solder mask to the surface of the PCB. This technique involves using a photosensitive liquid material that is exposed to UV light through a patterned mask, allowing selective areas to be coated while others remain exposed for soldering components. LPI screening enhances the durability and reliability of the PCB by providing protection against environmental factors and reducing the risk of solder bridging during assembly. This method is favored for its precision and ability to create fine details in the mask application.
What is the airport code for Linköping City Airport?
The airport code for Linköping City Airport is LPI.
What has the author Eric Douglas Murray written?
Eric Douglas Murray has written: 'Detectability bounds for LPI communications'
What is press resolution?
Its the image resolution required for magazine and newsprint. This can be anything from 72 LPI to 150LPI. Rule of thumb would be to design at least to 2x the LPI resolution. This makes 300dpi a safe resolution to use, though in some cases that may be too much. Better safe than sorry I say...
What is the distribution of Lumosity LPI scores among users in different age groups?
A study on Lumosity LPI scores found that younger users tend to have higher scores compared to older users. This distribution suggests that age plays a role in Lumosity performance, with younger individuals generally performing better on the cognitive training tasks.
What are the release dates for On the Road with Leah - 2010 Eye Surgery The LPI Procedure 1-16?
On the Road with Leah - 2010 Eye Surgery The Consultation 1-15 was released on: USA: 27 January 2011
Are there any free Linux certifications available?
There is none. All major Linux certifications (LPI, CompTIA, RHCE, etc...) all cost money.
What is the difference between an lpi dpi ppi?
LPI - Lines Per Inch - Refers to the number of lines of text a printer will fit in an inch of paper. (the smaller the font size the more lines per inch) DPI - Dots Per Inch - The number of dots a printer can put within an inch of paper (the smaller the print nozzles the more DPI' PPI - Pixels Per Inch - usually relates to the resolution of a monitor.
