What is AM and FM in printing?
normal viewing distance, the dots of a printed image create an optical illusion of a continuous tone image. There are two ways by which a con- tinuous tone image is transformed into a halftone image prior to printing on the press: amplitude modulated (AM) and frequency modulated (FM) screening.
What is AM screening in printing?
The AM SCREENING today is undoubtedly mostly employed to reproduce halftones in industrial printing technologies like Offset, typography and flexo. The AM SCREEENING is based on graphic grid where a dot stays fixed in its position in the center of any grid cell.
What is the difference between halftone screening and stochastic screening?
A type of digital halftone screening which varies the pattern of dots while keeping the size of the dots constant. In contrast, conventional halftone screening varies the size of the dots while keeping their frequency per line constant.
What is XM screening?
Hybrid AM screening (a.k.a. XM screening) is a method to compensate for resolution issues in the print production process in either plate, plate imaging, processing, press condition or a combination of those areas.
Which screening works best in mid tone?
AM screening
AM screening performs better in mid-tones. FM are more consistent in its ink delivery, therefore, some say that it is able to produce a very stable appearance.
Which factor is responsible for particular dot on the screen is getting printed?
It is caused by halftone dots growing in area between the original printing film and the final printed result. In practice, this means that an image that has not been adjusted to account for dot gain will appear too dark when it is printed. Dot gain calculations are often an important part of a CMYK color model.
What are the benefits of using stochastic screening?
FM/Stochastic Screening
- The Benefits.
- 1 – No screen angle moiré
- 5 – Greater tone and color stability as SIDs naturally vary during press run.
- 7 – Faster drying.
- 9 – Tonal and color stability when misregistration occurs.
- Color stability through the press run.
- Faster Ink Drying.
- LPI Integrity.
What is the difference between AM and FM radio?
For instance, if several different sets of data are required to be transmitted using the same medium, then each set off is sent using different frequency waves. This is the process of how radio broadcasts are done. Amplitude modulation is a modulation technique where the amplitude of a carrier varies depending on the information signal.
Which is better FM screen or AM screen?
XM uses FM screen in the highlighted and shadow areas and AM screen in the mid-tones. XM applies special technology to smoothly transition from one screen to the other. XM screens combine the best performance characteristics of both AM & FM
What are the advantages and disadvantages of FM screening?
Since FM screening utilize very small dots (usually from10 to 20 microns) to produce the images, very fine details are possible. As dots are randomly placed, this eliminates the screen angle problem, therefore eliminating the moirés and rosettes patterns.
Which is better for printing, FM or AM?
FM are more consistent in its ink delivery, therefore, some say that it is able to produce a very stable appearance. This could be good things unless your print doesn’t match your proof. When the mismatch occurs, it will be difficult for press operators to tweak the appearance on the press.
