Digital BW, The Print

on 6/30/02 3:30 PM, tboleyyh wrote:
 
>>>> One last thing about the dither. Tyler's test was of a single tone, which
>>>> got converted then tortured with a tonal adjustment.
> 
> It was also visible in several tones, and the tonal adjustment was just so you
> could see it better. It was visible before the
> adjustment too. I was only trying to show it to you clearly.

Can I borrow your glasses? On my gradients (4x6" @ 300dpi) I could see no
difference without applying pretty strong tonal moves.

 >> Another point is if you do your conversion last, so that you will not be
>> applying a tortuous tonal adjustment after conversion, dither, or not, will
>> likely make no difference.
> 
> On the contrary, the most severe tonal adjustment you will make, your sep
> curves, must be done after conversion.

That's an excellent point, which I hadn't considered. Interestingly though I
just did a gradient and converted to AdobeRGB with and without dither, then
applied a separation curve (selected somewhat arbitrarily, but trying to
pick one that is middle of the road: Roark's 1160 NC curve) and I could see
no difference. But I ain't got your eyes.

> It was just an observation, if you like the results with dither I'm not
> countering that.
> As I said, I have no idea if this is a problem.

Likewise. Just because a topic interests me (and I seem to enjoy the
minutia) enough to make some tests and share the results doesn't mean I'm
attached to any particular outcome. I'd much rather be wrong and learn
something than be right and learn nothing. I'm really glad you raised the
issue, I learned from it.

Todd

Todd