RE: Printing of photography
RE: Printing of photography
- Subject: RE: Printing of photography
- From: Helmut Abel <email@hidden>
- Date: Tue, 21 Dec 2010 00:21:19 -0800 (PST)
Hi,
here my 2 cent:
Recently I supervised a photo shooting of large format art paintings. We had big problems with even lighting. But the customer, a painter was very happy with the final printed result. I did only minor tweaks after the first proof. Here is how we proceed:
I created myself several large color bars which include a White swatch, C,M Y 100%, Red (M+Y 100%), Green (C+Y 100%) Blue (C+M 100) and Black (CMYK 100%) and the same with 50% tint. Those color bars have been printed by the same final output printer. (Offset or Digital)
I placed four color bars on bottom, top, left and right of the image. In order to control equal lightening.
In Photoshop, I corrected in RGB mode with CMYK values displayed. Make sure the display is set to 'Proof Color' mode. And the final output CMYK profile is selected.
First I adjusted and color corrected all those color swatches as close as possible to their original values. A match of 100% is not possible.
One problem is some colors of the painting exceed the saturation of the printing ink. (out of gamut) In this case we lose detail. In order to maintain detail in saturated colors you have to decrease the saturation. (in RGB mode) And if the artwork contains special pigments or substrates which make it difficult or impossible to reproduce, it needs professional tweaking (without affecting other areas). But those colors will never match the original.
After those corrections, the RGB can be converted to CMYK or send to a color server for printing correctly.
Helmut Abel
former
Hell - Chromacom trainer
******************
> > On Mon, Dec 20, 2010 at 9:18 AM, David Ramsey
> > <email@hidden>
> wrote:
> >>
> >> 2 questions;
> >>
> >> 1) I am getting ready to photograph some works on
> paper for a museum
> >> and I was asked about including "color bars" in
> the photos. Because
> >> of the nature of the materials used in these works
> I have to adjust
> >> specific colors as we shoot (Color managed
> workflow and calibrated
> >> display). Colors are adjusted individually, for
> example, purples may
> >> go
> > towards blue reds towards magenta.
> >> So if I place color bars in the frame and will
> this not create havoc
> >> down the line since I am moving individual colors
> around? Also which
> >> color bars should I use if they are to be
> included?
> >
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