Digital BW, The Print

On 4/4/02 11:42 AM, "Todd Flashner" <tflash@...> wrote:

>> This seems like an achievable measurement and definitely different from the
>> original D1 in equation (1). I wonder what, if anything, it really tells us?
> 
> John,
> 
> I followed along as best I could, but I did get lost (not understanding
> delta and all), but here's the deal. By the time you've measured all your
> 256 density patches, what do you want to do with that data? Do you want to
> compress it all into a value like 2.6, or 25db, that really tells you very
> little about the characteristics of your print (short of suggesting a
> density range), or would you rather plot it as a curve (which is how I've
> always seen silver papers characteristics represented), to get a more
> meaningful representation of the qualities of said print?

I by delta (d1,d2) I just mean (d1-d2) if (d1>d2) and (d2-d1) if (d2>d1)

Ie 'the positive value of the difference between'

I would much rather see a plot, as you suggest, but I am trying to suggest a
mathematical basis for the alternative definition of dynamic range we've
seen.
-- 
John Brownlow

http://www.pinkheadedbug.com