Digital BW, The Print

Johnny Deadman wrote

> on 8/12/01 8:16 AM, Peter Marquis-Kyle at petermk@... wrote:
>
> > Thanks for the warning Dan!
> >
> > I was sceptical, but I did a quick test with a greyscale gradient -- and
there
> > was the gap, just as you said.
> >
> > Can anyone who understands the innards of Photoshop suggest why it is so?
>
> you might expect this kind of thing to happen if the manipulation was being
> done in the wrong gamma.

Johnny:

This is the quick test I did; why don't you try too (I would like to know what
you see):

1    open a new file (mode: greyscale; contents: white; size: 2000 px square)

2    fill the file with a gradient from black to white

3    look at the histogram (nice and smooth)

4    change the mode to RGB

5    look at the luminosity histogram (I see a spike and a gap near the black
end)

Cheers

Peter Marquis-Kyle