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#21
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Screen angles
On 5/11/2008 5:09 PM David Nebenzahl spake thus:
By the way, the standard screen angles for 4-color (CMYK) printing a K (black): 45° M (magenta): 75° Y (yellow): 90° C (cyan): 105° Interesting explanation of screen angles can be found at http://www.dtp-aus.com/hlftone.htm (scroll down to "Screen(#) Ruling and Angles"). Interestingly, it's not just a matter of reducing moiré effects; the screen angles are selected to create "rose" patterns which, apparently, are the least bad alternative (there will always be some kind of pattern generated by multiple halftone screens, and this is thought to be the most pleasing one). -- The best argument against democracy is a five-minute conversation with the average voter. - Attributed to Winston Churchill |
#22
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Enlarger lens options.
"Jean-David Beyer" wrote
I make some 50% dots (my densitometer will measure % dot area) and make the contact prints 50% ... Brings back memories ... My firm designed a graphic arts exposure integrator that had exposure adjustment in % dot gain (along with stops, OD (for step-wedge test results), and straight %). Then we designed nuVac for stochastic screening and the hell with dot-gain. All about 20 years ago ... the dénouement of analog pre-press. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com |
#23
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Enlarger lens options.
Nicholas O. Lindan wrote:
"Jean-David Beyer" wrote I make some 50% dots (my densitometer will measure % dot area) and make the contact prints 50% ... Brings back memories ... My firm designed a graphic arts exposure integrator that had exposure adjustment in % dot gain (along with stops, OD (for step-wedge test results), and straight %). Then we designed nuVac for stochastic screening and the hell with dot-gain. All about 20 years ago ... the dénouement of analog pre-press. I just use a Macbeth densitometer TD-901 that has a %dot scale. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 10:25:01 up 5 days, 2:57, 3 users, load average: 4.05, 4.02, 4.03 |
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