Cold mirror filter

RS
Posted By
roni.segoly
Oct 1, 2005
Views
274
Replies
4
Status
Closed
Hi,

Can someone pelase show me example of using cold mirror filter with Photoshop, I have one but not surewhat is used for.

Roni
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N
nomail
Oct 1, 2005
wrote:

Can someone pelase show me example of using cold mirror filter with Photoshop, I have one but not surewhat is used for.

I’m not sure either, especially because there is no such filter in Photoshop. A (real) cold mirror filter is a filter for infrared photography (it filters out visible light and only lets IR light go through).

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/
RS
roni.segoly
Oct 1, 2005
I know its not Photoshop filter, it physical, I understood I have to manipulate the picture after, using Photoshop to see the effect, and that is why I asked here.

Some sites mentioned I need to use only one channel of the picture.
S
steven
Oct 4, 2005
"Johan W. Elzenga" wrote in message
wrote:

Can someone pelase show me example of using cold mirror filter with Photoshop, I have one but not surewhat is used for.

I’m not sure either, especially because there is no such filter in Photoshop. A (real) cold mirror filter is a filter for infrared photography (it filters out visible light and only lets IR light go through).

A cold mirror reflects shorter wavelengths (typ. to 800nm, i.e. UV and visible) while it transmits longer wavelengths (IR). If a cold mirror filter exists I think it’s just an IR filter. The reflection part doesn’t make sense in filtering.
Steven
RS
roni.segoly
Oct 6, 2005
My question was much simpler and sorry for being layman.

When I put the filter on my camera, the amount of light gets to camera is much less (using the camera as is while taking the picture, I cannot see if Infra Red is still getting more than regular light).

If I set the camera (speed aperture) to that amount of light then the picture is a bit dark but OK (as if picture taken in less light).

Now when using Photoshop where should I see the impact of the fact the filter blocks regular light and enable Infrared? Should I use only one channel (The Red one looks regular). Should I take the picture originally in same setting as if there is no filter (under exposure)?

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