Talk:Photographic filter
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[edit] filter to subtract all color
Is it possible to create a filter that cancels out colours and produces a black and white image?
- I've wondered that too. But with this being so easy to accomplish in Adobe Photoshop, I'm not sure what the use of such a filter would be. But a b/w mirror, now that would be something amazing! ShutterBugTrekker 23:12, 22 November 2005 (UTC)
- No passive optical device (e.g. a filter, or the like) could do this. It would have to be capable of responding to the light and re-emitting it as white light. You might be able to do something like it with an image intensifier or micro-channel plate. In general it will have to be the functional equivalent of a camera plus a black-and-white display. --Bob Mellish 23:51, 22 November 2005 (UTC)
[edit] Geometric filters
How do you call filters that make effects as you can see them here and how do they produce this effects? I even once had fun sun glasses that produced a lot of smileys whenever you looked in a bright light source. --Abdull 23:36, 16 April 2006 (UTC)
- Those appear to be called "star filters" — We should have an entry for that. The monkeys sound like a hologram of some sort;
maybe an entry for that too... Steve Pucci | talk 16:09, 20 April 2006 (UTC)- On second thought I doubt if there's such a thing as a holographic filter for photography; sounds more like a novelty sunglasses kind of thing. Steve Pucci | talk 16:13, 20 April 2006 (UTC)
- The effect is quite likely a diffraction pattern, similar to those laser pointers with various tips to project different images. Anything transparent you can see and take a photo thru could legitimately be termed a photo filter, though perhaps not a very widely used or standardized one... - Akb4 19:41, 3 September 2006 (UTC)
- On second thought I doubt if there's such a thing as a holographic filter for photography; sounds more like a novelty sunglasses kind of thing. Steve Pucci | talk 16:13, 20 April 2006 (UTC)
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- Star filters are the same as Cross Screen filters, as it says in the summary at the top. I've just tried to reorganize the "types of filters" section to make it a bit clearer that these are types of uses of filters, and I took a stab at filling in some of the stub types. Steve Pucci | talk 21:41, 27 April 2006 (UTC)
[edit] Color correction vs color subtraction
Aren't all color correction filters implemented with color subtraction? Doesn't this mean color correction is a special case of color subtraction? If so, maybe we should reorganize those two sections. Steve Pucci | talk 16:08, 21 April 2006 (UTC)
- OK, I understand now. These are two different types of uses of filters. I've tried to make that a bit clearer in the article. Steve Pucci | talk 21:41, 27 April 2006 (UTC)
[edit] Series Filters
A specialist dealer in England ([1])gave me the exact dimensions of a Series VII retaining ring; it'd probably be really useful if we can get the other sizes, and the sizes of the filters themselves, listed. I don't know enough about machining to know if diameter and thread is enough; I would think thread depth and wall thickness would also matter, and I have no idea if tolerances were part of the specification. The series adaptors I've tried (maybe half a dozen or so?) always fit correctly, so there must have been a spec... - Akb4 19:41, 3 September 2006 (UTC)
