Digital BW, The Print

Thanks for this curvy tip, Ken. Here's another one that generates what
someone called an Agfa Porta-like print. I picked it up off the Leben Inkjet
list long ago:

1. Start with an image and convert it to greyscale to produce an image you
find pleasing.
2. Duplicate the image.
3. In the duplicate image erase all imagery and convert the file to CMYK
4. Go back to the original and copy the image into the clipboard
5. Go to the CMYK image and click on the channels pallette
6. Paste the image from the clipboard into "each" of the CMYK channels
7. Convert CMYK image to RGB
8. Open up Curves
9. Click on the little triangle that points left on the slider
10. Click on the 50, 50 input/output point (center) of the graph
11. Drag it downwards till it reads 50, 25 (input/output)
12. Drag down the upper right point (100,100) to read 100, 94 or so.
13. Readjust as necessary.

And remember to confess your philandering, I mean filtering, sins to the
Photo Purists!

Luke

> Ken, nice look, just downloaded it and tried it on an old photo that
> I am restoring and just the look I have been trying to get. Much
> thanks

I forgot to mention that there is no "levels" adjustment required. I went to
some effort to make sure that the curves are "linear". You can flip back and
forth from greyscale to quadtone with no apparent change.

If you look at the choice of "inks" that comprise these curves, you'll see
it's really a Tritone plus a neutral black. I recommend this for all
Quadtones. The black ink is used here and there, just to make sure that all
10 zones fall where they should be.

If I were a more patient person, I would have done it over a 20-step scale,
but if you look at the Paul Rumohr's image, posted on the Large Format Forum
at http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=003lzc, you can see
that it's already "close enough for government work".

Lawrence -

> I am sure this is a stupid question.  But, for printing quadtone images do
you
> recommend converting to RGB from quadtone before sending it to the Epson
> printer, or will the print driver just convert it on its own.  That is, is
there any
> difference printing in RGB or quadtone mode ?

I just print straight to the printer, without converting to RGB.

> By the way, I concur that tones are beautiful with your modified quadtone
> preload.
>
> Final question, anyone have any other quadtone curves to create digitial
> platinum effect.

If you send me an image, or refer me to one on the web, I'd be happy to give
it a try.

- Ken

Lawrence -

> I am sure this is a stupid question.  But, for printing quadtone images do
you
> recommend converting to RGB from quadtone before sending it to the Epson
> printer, or will the print driver just convert it on its own.  That is, is
there any
> difference printing in RGB or quadtone mode ?

One other thought: when you convert to RBG, the size of the file increases.
A greyscale image does not have the R, G, and B channels, and is thus much
smaller. It is certainly more economical to save the duotone, which is just
a greyscale image and a small .ADO file that desribes the curves.

It may well be that Photoshop creates some kind of temporary intermediate
RGB file, which it sends to the printer and then discards, but once you
convert to RGB and save the image, you have lost the original greyscale
information. It seems to me that the best way to retain the original image
(in case you want to present it differently later, with a different duotone
curve set) is to save it as a duotone.

- Ken

I'm interested in using the VM inks, and it seems that the roark 
curves are the way to go...BUT i want to start with a cheaper printer, 
maybe a 740. is there a way to do that? beg paul to create a curve 
for the 740?

mattMatt Haber
dance, portrait and fashion photography
http://www.matthaber.com

> Final question, anyone have any other quadtone curves to create digitial
> platinum effect.

    Dan Burkholder has a nice faux platinum curve on the CD that comes with his book about making digital negatives.  www.danburkholder.com






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[Non-text portions of this message have been removed]

--- In DigitalBlackandWhiteThePrint@y..., "Ken Carney" 
<kcarney1@c...> wrote:
> > Final question, anyone have any other quadtone curves to create 
digitial
> > platinum effect.
> 
>     Dan Burkholder has a nice faux platinum curve on the CD that 
comes with his book about making digital negatives.  
www.danburkholder.com
> 


Unless I'm much mistaken, that curve is to adjust images to make 
digital negatives from imagesetters or inkjets for making platnium 
prints, not to simulate a platnium look.

Peter
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