Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@y..., Jim Respess <jim@g...> 
wrote:
> "Use the channel mixer on a color image, full red to monochrome.
> 
> Tim Spragens
> 
> > Is there a way simulate the use of a red filter in Photoshop? 
There
> > has to be away. I have been playing around with the idea, but 
cant not
> > think of a good way to do it.
> >
> > Thanks
> >
> > Steve"
> 
> The key term here is color image.  Once it's in grayscale, you no 
longer
> have that option.  B&W film is color sensitive; a red filter allows 
red
> light to pass but not blue.
> 
> Jim
> 
> James G. Respess
> 858-272-1926
> http://www.greenflashphotography.com


TRY THIS: open your color image in rgb. go to "window"/show channels. 
the channels dialogue box will appear. you will have the rgb image, a 
red channel, green channel and blue channel. click on each image and 
it will come up full size. you now can view how the image will look 
with a green filter, blue filter and red filter. the red filter is 
not always the most appropriate for an image. the green filter is 
many times the most pleasing for landscape. only problem is you 
cannot simulate the yellow filter. very often the blue channel will 
be awful and full of noise.

in lanscape photography each of the filters, blue ,green ,red has a 
profoundly different effect on the image since the filters control 
the area of the spectrum reaching the film. if you shoot with color 
film you can get this effect in photoshop with one image using the 
three different channels.

larry pirrone