Re : [WM]: Help about colour images...

[miguelco <miguelco@arrakis.es>]

Hi Raphael,

	I recomend you to insert it into the all three bands, because 
this way it will get some JPEG robustness, because it's color band 
processing.

As you said, most people use the blue channel, and it's because this 
band is the most difficult to see for humans.

The explanations has to do with Darwing and it's evolution theory, in 
some way, because is you look at the solar radiation that arrives to 
the Earth, you'll see that the band that arrives with most energy is 
the green band, and the one that has less energy is the blue one.

So, our eyes are adapted to see better within the band with more 
energy, the green one, and that's the explanation on why signals on 
the blue channel are less visible.

Anyway, if we annoy Joe enough, perhaps he would write us some MatLab 
code.
Nooo, just kidding X-DD

Miguel


____________________________________
Original message:

Hello,

I am developing a project about Digital Image Watermarking. I am 
applying a 
Fourier Mellin Transform and it works good for greyscale images. Now I 
want 
to do the same for color images but I know I have to separate the 
image in 
three images(R,G and B). I think I must insert the watermark only in 
one 
channel and it must be the blue one, or I have to insert it in every 
channel?.

What do you recommend me to do?. Why most people use the blue channel 
when 
they want to insert the information in the image?. Thanks in advance.

regards,

Raphael.





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