Digital BW, The Print

uncle

uncleuncleuncle

you are supremely adequate

me...
...mmm ... not so much

ah screw it, here we go...

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
<stevekale@b...> wrote:
>
> It's simple: in every description I've read of the two (perceptual vs
> relcol+bpc) including that which I quoted below there is no stated
> difference with regard to the greyscale axis.  You claim, by virtue of
> observation only, that there is a difference with regard to the
greyscale
> axis but can't adequately explain why.

Observation works quite well thanks. I think that's one reason most of
us accept that the world is not flat. The explanation seemed, and
remains, adequate to me. At this point that's enough.

>  You dismissed my suggestion that
> possibly a profile builder would want, when given the freedom the
perceptual
> intent gives him/her to do things any way he wants, to tackle the
issue of
> mapping black point in a manner differently to Adobe's BPC algorithm
simply
> because you "don't think they've ever been the same nor should be".

I did not intend to dismiss any suggestion of yours. However the
statement remains true to me at least. I made some attempt to explain
why, perhaps inadequately to you, adequately to me. Also, this is a
bit out of context. The statement was made as a response to this (as
long as we're quoting each other)-
" It's also interesting to note the difference in a soft proof
 using a GM i1 profile between perceptual (which has built-in BPC) and
 relative colormetric which does not. In a B&W world, one would
generally
 expect these two to be the same."

There was no dismissal on my part about what a profile builder might
wish to do. You noted the different behavior between the two
conversions, and claimed they should not be different. I replied that
they are different, and why it made sense to me that they remain so.
Color management remains somewhat mysterious to many, I certainly
respect your dogged attempts for more technical clarity.
However, when I see a statement that in my experience is in error or
may confuse matters, I jump in. Again-
Perceptual conversions vrs Relative Colormetric w/ BPC conversions
behave differently here the vast majority of the time, it's definite,
not refutable. In addition, that differing behavior makes some sense
to me, and I won't attempt again to explain why.

I would have hoped that the above observations would have helped your
general inquiry into this whole issue.
Again, for some reason, possibly the way we both write, we seem to
descend into something that feels a bit "tit for tat". It's not my
intention, and it's uncomfortable.
So- uncle
Tyler