Advanced Masking/Selection Capabilities

How to select a part of an image for masking based on either color saturation or  hue or a certain color (not RGB value but rather a color group), so that I can  transform the selection to the Alpha channel.
For example, if I have a  photo of a red car on a multi-color, complex background where there are NO other  red colors exist on the picture, other than the body of the car, then such  selection (that I need help with) suppose to select all shades of red on the  photo, which is only the body of the car.
I guess you know what I'm  trying to do, right? I need to create a PNG file where certain part of an image  (like a body of that car) would be gray-scale alpha channel, so that by placing  the image file on colored background - that would simply paint the car into  another color.
See an example on this page: http://www.netchain.com/test/Png.asp

Thank you very much for such a thorough respond. Since it seems like you know your way around Photoshop, I thought I would ask  you another question, if you don't mind of course.
The reason I was looking for the answer for my previous question, was because I  wanted to transform that
selection into gray-scale alpha channel, so that if  I save the file as PNG maintaining gray-scale transparency
in the  alpha-channel, and if I place that PNG file on colored background on the web,  then the part of the
image in alpha-channel suppose to get colored  accordingly to the background color.
I was wondering if you can help me  with that, since I'm a bit confused about the Alpha-channel. I think I  can
apply the alpha-channel to the selection, but it doesn't get saved in PNG  file, probably because I am missing
something
You can see the example  of the image that I want to make (made by someone else) on this test page:
http://netchain.com/test/Png.asp
As  you can see on that page, the sweater on the picture has alpha-channel, so it  assumes the color of the
background of each block.
Thank you very much  in advance, and God bless you.
Sana

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