Digital BW, The Print

Only 'nearest' values are able to be inseted in the curves Input box ?

So far, working on my Red/Cyan curve only allows tweaking up to the 
255 unit mark ( of course) so what about the % values above that ?

58%=148 (nearest value 146 inserted) on curve = output 78 > changed 
to 79 - correct?

67%=171 (nearest) = output 145 >changed to 146

78%=200 = 254 output > changed to 255

And that's it ! No where to go with 85%,87%,92% flat points ?


--- In DigitalBlackandWhiteThePrint@y..., "B. Alex Pettit Jr." 
<a_pettit_jr@y...> wrote:
> Hi Frank,
> I know you got the 2.55 X the percentage formula for conversion to 
the 8 bit grey scale. What is even worse than flat spots, is a 
reversal in shading. I've sure done that many times in my 
experiments. They lead to strange solarized photos.
> 
> 58% = 148
> 59% = 150
> 
> 67% = 171
> 68% = 173
> 
> etc.
> 
> Greyscale step = ( 2.55 * percentage ) 
> 
> Best,
> Alex
> 
> --- In DigitalBlackandWhiteThePrint@y..., "frankg_photo" 
<frank@f...> wrote:
> >>
> > But the sep tablet i printed is in 0-100% points - so how do I 
find 
> > the flat points - how to convert them to the input and then 
output 
> > number(58/59%, 67/68%, 78/79%, 85/86%, 87/88%, 92/93%) ?
> > 
> > Hope I'm making sense ?
> > frankg