Quote:
Originally Posted by andyh2000
If you can paint sub-millimetre patches of translucent red, green and blue in a regular pattern then go for it! I suppose you could maybe ink-jet print onto an OHP transparency (do they still exist?)
Andrew
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No domestic ink-jet has the accuracy, though some have the dpi.
Also standard ink-jet ink is cyan, yellow and magenta as well as black as it's subtractive print colour. Not additive. Won't work!
The Triton used a similar filter to LCD, which is is also monochrome but with 20 to 50 times more grey levels and backlit. So Triton was too dark and like old displays used R, G, B stripes which meant horizontally you got 1/3 resolution. A 2002 LCD panel of 1600 x 1200 is actually a 4800 x 1200 mono panel with stripes.
Kaleido uses two tricks:
1) Using pastel red, green and blue allows more light reflected, unlike an LCD the light has to pass the filter twice (once on LCD).
2) Using dot patterns instead of stripes. This means instead of 100 x 300 dpi on a 300 dpi panel, the colour is 150 x 150 dpi.
On both schemes a mono image or mono text can't any longer be 300 dpi in all circumstances. The mono resolution varies with image / text content, but like "cleartype" on RGB stripe LCD, the effective resolution is better than the 150 dpi of colour.
Kaleido is still a lot darker than regular mono eInk and also less saturated. It suits traditional 1930s style "US comic" print. Because there is black, nearly white and only 14 greys all shades/hues only add up to about 4000 rather than 32768 or 16,000,000 or more (HDR) on LCD, CRT, Plasma, LED and OLED.
There is little value unless you read a lot of comic books.
And OHP film still exists in three kinds:
1) For pens only, melts in a laser printer and ink-jet runs. (cheapest).
2) For a modern copier or laser (Colour or mono). The heat roller to seal/melt the toner is the issue.
3) Slightly textured on one side or coated. (most expensive)
None work well with ancient liquid toner copiers, but I've not seen one since 1970s.
The easiest source here in town is clear fronts (A4) for making up booklets or CVs, but you need to see the box if buying one to see if suitable for a copier/laser.