RE: Subject: Digital Camera tone curve
RE: Subject: Digital Camera tone curve
- Subject: RE: Subject: Digital Camera tone curve
- From: "Kevin Love" <email@hidden>
- Date: Sat, 9 Nov 2002 16:46:37 -0600
Message: 7
Date: Thu, 07 Nov 2002 09:06:36 -0500
From: gene koehler <email@hidden>
Reply-To: email@hidden
To: email@hidden
Subject: Digital Camera tone curve
I shoot with a leaf digital camera with Creo capture software. and I'm
a little confused
on setting my tone curve. I have been using a 5 stop curve with my
high lights at 243 & my shadows 23.
That as been working fine until one client said he could not get the
blacks black & the whites white.
I was told by a camera sales man at the photo expo to use 255 & 0 , that
I should be giving my clients
all the information .that also brings up my next question I know a
press is only able to show 4-5 stops ,
film is 7-8, the digital camera is 12 .what will happen to an image that
as a tonal range of 8 . when I convert that image
into cmyk using photoshop 6 it looks fine.
Gene,
Your placement of white with detail (243) and black point with detail (23)
are common settings. The working space and how those numbers convert to
CMYK and the methods doing so should be considered and discussed with the
client. The Leaf software will yield the full RGB tonal scale of 0-255 when
exported. The highlight and shadow points that you are setting will become
the areas that you expect to retain detail. Many Photographer confuse these
values as being the absolute limits. The part of the curve from these
points to the area were it flattens (top or bottom) will gradually
transition to pure white or total black respectively. The 5 stop range
that you are shooting to is very typical when you are equating this to
realistic photographic scene brightness ranges. It is difficult to shoot to
a 4 stop contained range. The bottom scale of the Leaf toning window can be
equated to the scenes brightness range. It will the distribute the values
when exported to the 0-255 (right side vertical scale). This is a tone
reproduction visual for your digital camera. This is the familiar to you if
you have plotted or matched paper grade to film curves.
You are correct on the stop ranges you mentioned, realize that film is
compressed to fit the 4 stop print range when scanned and the digital camera
will compress when exported. Find out the values that the client needs for
highlight and shadow values based on the Photoshop working space and how the
profiles policies are being handled when opening the file, if embedded.
klove
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