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 Film output resolution of B/W images using Bookpaper

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leo_arvada

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Number of posts : 26
Age : 55
Location : Makati City, Philippines
Member since : 2007-06-16

PostSubject: Film output resolution of B/W images using Bookpaper   Tue Aug 07, 2007 3:35 pm

Want to know the exact lpi resolution negative output of B/W images using bookpaper for magazine w/ 2 color printing. Designed in Illustrator CS w/ link images from Photoshop. A good quality examples of printed newspaper w/ clear B/W picture. How did they do it from prepress to postpress? Big thanks for the help.
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Flexoto

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Location : Pampanga
Member since : 2007-06-15

PostSubject: Re: Film output resolution of B/W images using Bookpaper   Tue Aug 07, 2007 11:55 pm

Leo, para sa akin the best resolution will depend on the quality of equipment you have like your platemaker and offset machine and the ability of your machine operator. Technically 150lpi is better than 133lpi. But the first question is "Is your platemaker good enough to copy the image with 150lpi?" If not, then 133lpi or 120lpi is better. Second, you should ask "Is my machine and my operator is capable of handling such high resolution?". If no, then go to a lower resolution.
I suggest use 120lpi if you are using wipe-on plates and 133lpi if you are using ps plates for bookpaper. Smile
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billy

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PostSubject: Re: Film output resolution of B/W images using Bookpaper   Wed Aug 08, 2007 5:36 pm

I agree with rempress,

I came from service bureau and most of the printers are using 133LPI or 120LPI. But as rempress said, if your machine and operator can handle 150Lpi why not.
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presstech

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PostSubject: Re: Film output resolution of B/W images using Bookpaper   Wed Aug 08, 2007 7:25 pm

When converting rgb to grayscale, I suggest you view the different channels and select the channel with the best image. In most cases this will be the red channel. After the selection you can then change mode to grayscale.
There is a technical article on this subject at www.philprinting.com .

I also agree that the usual screen resolution for bookpaper is 120 and 133 lpi. Increasing the resolution will also mean an increase in dot gain. If you use higher screen resolutions, you will have to compensate for the increase in dot gain either by lowering the middle tone of the images in PS or by using global dot gain compensation in the imagesetter rip.
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leo_arvada

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Number of posts : 26
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Location : Makati City, Philippines
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PostSubject: Re: Film output resolution of B/W images using Bookpaper   Fri Aug 10, 2007 2:41 pm

Your suggestion was really helpful. I really appreciated your comments and suggestions. By this time time, I will rely on your recommendation. More power to you guys and a big thx too and this forum and to Sir Fred. cheers
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