Re: Hue/Saturation to simulate filters w/ B&W film


In article <1gz0ud9.1i6k9rf1o0piueN%nomail@xxxxxxxxxxxxxx>,
nomail@xxxxxxxxxxxxxx (Johan W. Elzenga) writes:
> Warren Sarle <saswss@xxxxxxxxxxx> wrote:
>
> > In article <1120158518.689729.219250@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
> > "Brian" <ripcurl187@xxxxxxxxx> writes:
> > > I've been playing with the dual hue/saturation adjustment layer
> > > technique for simulating the use of color filters when converting color
> > > images to black and white.
> >
> > What you want is a Channel Mixer Layer, definitely not
> > a Hue/Saturation layer. Put a check in the Monochrome box
> > to convert to B&W.
>
> Nonsense. The dual saturation adjustment layer method was developed by
> Russel Brown. It works very well. The Channel Mixer also works fine, of
> course.

Brian says he wants to simulate the use of color filters in black
and white photography. The Channel Mixer does precisely that in a
simple, direct way. For an orange filter, as Brian mentioned, just
turn up the red, turn down the green a little, and turn down the
blue a lot.

Doing this with dual H/S layers is much more cumbersome, confusing,
and inefficient. Note that Brian was trying to use the hue slider to
simulate the orange filter, which does not work. Most of the people
reading this newsgroup probably have no idea why the hue slider
would have any effect on the resulting grayscale image.


--

Warren S. Sarle SAS Institute Inc. The opinions expressed here
saswss@xxxxxxxxxxx SAS Campus Drive are mine and not necessarily
(919) 677-8000 Cary, NC 27513, USA those of SAS Institute.
.

Relevant Pages

  • Re: Hue/Saturation to simulate filters w/ B&W film
    ... > I've been playing with the dual hue/saturation adjustment layer ... > technique for simulating the use of color filters when converting color ... What you want is a Channel Mixer Layer, ... Warren S. Sarle SAS Institute Inc. ...
    (comp.graphics.apps.photoshop)
  • Re: Binaries with webcams
    ... images are a necessity in something like this. ... stellar images can be problematic for color sensors. ... get very good color images of stars if you use a B&W camera (including a ... Firewire device) along with color filters. ...
    (sci.astro.amateur)
  • Re: Hue/Saturation to simulate filters w/ B&W film
    ... > technique for simulating the use of color filters when converting color ... > images to black and white. ...
    (comp.graphics.apps.photoshop)
  • Re: Has NASAs MESSENGER gone color blind?
    ... color filters. ... What we have been seeing are the B&W images of selected ... spectrum shots. ... The photos we've been seeing are those using the visible red filter on the spacecraft. ...
    (sci.space.history)