quote:
Originally posted by QtanJ
Of course , now I get it. Didn't think about a transparent color isn't necessarily a filter itself, but just a transparent color(you know it's possible to print transparent colors?)
Actually, you understand it wrongly though.
It is impossible to print a transparant color.
This is because you use inkt, this is not a translucent material; the inkt drop will cover the area entirly and will not let any light thru. The "transparent effect" (note the quotes) comes only from the fact that not everything in the area is covered by a inkt drop. Blown up a printed red square looks like:
X X X X X
X X X X X
X X X X X
X X X X X
(where X is a miniscul red inkt droplet. The rest is just the unprinted paper (or transparant sheet). The inkt also lays on top of the paper, it isn't the paper itself).
Hence this red square will not filter out the red color. Any color will simply pass where there is no inkt drop and will simply be blocked where there is a inkt drop. The red color you see when you look at the red square comes from the light that falls on the red ink drop and which is reflected (hence the color of the inkt is red as only red is reflected and the rest is absorbed).
A filter is something entirly different, it is a true transparant sheet which is entirly made out of a certain color. There are no dots of inkt on there; the entire sheet is the same transparant color:
XXXXXXXXXXX
XXXXXXXXXXX
XXXXXXXXXXX
XXXXXXXXXXX
XXXXXXXXXXX
Hence you will never be able to print color filters.
quote:
Originally posted by QtanJ
Have to buy some special color filter sheets then.
Or find some colored plastic sheet to experiment with (eg: green bottles, red plastic cover of some toy, etc). It will not be a thru calibrated color filter also, but will come very close. Of course, you'll need to adjust your paintings to the colors of the plastic.
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PS: the dotted pattern produced with printing will also defract and defusse the light; the light shined thru will be blurry, while if it is passed thru a true filter, it does not diffuse, it stays equaly sharp.
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