----- Original Message ----- 
From: "Markus Maurer"

Subject: converting color photos for black and white

You got some good advice from Paul, but you may have problems finding
a lab that has the Portra black and white paper (which is, in fact, a
colour paper, but I digress).

If you are planning on doing the scanning yourself, make sure you
know what colour space the lab is working in. The industry standard
is sRGB, but that doesn't mean that is where they will be working.
You may have to spend some time calibrating your colour to the lab's
colour.

Or, hand the job over to the lab and let them do it. If they have to
print on colour paper, then you may have to decide which colour cast
is least offensive, since it is nearly impossible to get a perfectly
neutral black and white print out of a colour process.

William Robb


>
> Hi Pentax users
>
> I' am playing with the idea of making some black and white
enlargements in
> the size of 24X36cm of older color photos, sadly most are from fast
ISO
> 200-400 negative color film, so I expect some real visible grain.
>
> What's your experience with conversions from color to black and
white and
> should I just let the lab do it from the color negatives or photos
or try
> scanning the color pictures or negatives (if I still have them) and
> manipulate them on the computer. I have the software to do so but
really not
> much experience with that. What loss of quality do I have to
expect?
>
> The computer would be nice because I can preview everything and
crop the
> image myself, on the other side, my scanning equipment is not that
> professional to scan negatives very well.
>
> thanks
> Markus
>
>
>


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