![]() I've also attached an illustration of four FM spots. I've attached the definitions of spot and FM from the handbook.ģ. That's a good picture of yourself on the forum.Ģ. You can acheive extreme quality, control drying time between passes, change the pattern of the FM dot placement and really set the print times into the zone of 'TARDIS Required'.ġ. If you try Gutenprint those restrictions are removed. The drivers from the printer manufacturers are optimised for practical speeds. Generally to make all this practical you have to step down the resolution for larger prints. Then add into that 6+ colour ink abilities and you are way beyond offset FM printing.Īnd no doubt to realise the quality need images in 16pbc. So if you consider that some IJ printers have variable dots in 3 sizes and resolutions up to 2880dpi, you are way beyond traditional laser imaging for print. In comparison with a HD laser imager which usually have a fixed 'dot' size many of the modern inkjets are able to modulate the dot (splat) size. But they are only practical for small prints as both the rendering time and print times are so extreme. There are some setting in Gutenprint that turn inkjets into really fantastic printers. What you can do and what you are willing to wait to see printed are very different. PS: Can anyone back up the claims by the ink jet crowd that they can get 300 FM spots per inch. High quality magazine printing is mostly 150 AM spots per inch. 75 FM spots per inch happens to be a very high resolution for FM spots. From which - FM spots per inch = 2440/32 = 76 FM spots per inch.ĬONCLUSION: Ink jets do indeed make “stunning images”. A square FM spot is then 32 by 32 microdots wide.ħ. For four colors, you then need space for 1024 microdots. Thus you need space for 256 microdots per color to go from zero to full color. Assume an eight bit per channel tonal range. I will therefore assume that in reality they are getting 2400 microdots per inch for an expensive ink jet printer.ĥ. I could not find anything on the internet which explains “optimized” other than that it gets you stunning images.Ĥ. The ink jet crowd has always double talked how many micro-dots per inch that they can get. They are called droplets, micro-dots, drops, dots, etc. The FM spot is composed of tiny microdots sprinkled around in a pseudo-random fashion within an FM spot. The Graphics Industry Handbook recommends calling it FM spots per inch. Lines per inch has also been called dots per inch, printer pixels per inch, screening, and half tone cells per inch. ![]() In the distant past, I have made the audacious claim that ink jet printers can not get 300 dpi where dpi seems to mean lines per inch.
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