[filmscanners] Re: Black and white scans on LS4000 EDandotherissues

["Arthur Entlich" <artistic-1@shaw.ca>]

Arthur Entlich wrote:

> Make this day on your calendar... Austin and I agree on something! ;-)
>
> Art


OK, maybe "MAKING" a new day on the calendar is a bit much to ask, it
was supposed to read "Mark this day on your calendar..." ;-)
Art


>
> Austin Franklin wrote:
>
>
>>Bob,
>>
>>
>>
>>>Enlargers can have interchangeable diffuse light sources and
>>>parallel light
>>>sources. The former give soft images with less contrast, while the latter
>>>give sharper images with higher contrast.
>>>
>>>
>>That's absolutely NOT true.  You do NOT get softer images with less contrast
>>from a diffuse (typically called "cold") light source.
>>
>>There has always been a controversy about the merits of
>>cold-lights.  Careful tests have proven that exactly the same tonal
>>rendition can be attained with either a cold-light or a conventional
>>condenser when the contrasts of the film/paper are adjusted to match.
>>
>>The contrast difference between condenser and diffusion sources is
>>due to "Callier" effect which is scattering of light by the grains of
>>the film.  The thinner the emulsion and the finer the grain, the less
>>Callier effect there is.  For color film, where the image is composed
>>of very small dye particles, there is practically no difference between
>>them.  The diffused source will tend to show blemishes less so is
>>commonly used for color printing.
>>
>>Personally, I believe cold light heads give better tonality for B&W chemical
>>darkroom printing, having spend some 25+ years printing fine art B&W
>>prints...
>>
>>Austin
>>
>>
>>
>>
>
>
>
>


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