Réf. : RE: CMYK separations on Adobe Photoshop

Reply-To: "philippe berger" <mineurdecharbon@skynet.be>
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With the color image:
1. Red Layer for the Cyan image with The Cyanotype
2. Blue Layer for the Yellow image with The Beer Gum
3. Green Layer for the Magenta image with The Beer Gum
Just 3 layers
 
http://users.skynet.be/philippe.berger/projetberger1.jpg
 
Philippe
 
 
-------Message original-------
 
De : alt-photo-process-l@sask.usask.ca
Date : Saturday, October 30, 2004 18:20:43
A : alt-photo-process-l@sask.usask.ca
Sujet : RE: CMYK separations on Adobe Photoshop
 
Hi,
Let me try.
Photoshop can save any layer you want, just make a copy of the original file
you are working with.
On your copy file generate the layer you want and delete all the other
layers, then save.
I know the plug-in, thre are plenty around, I work with Harrys filter at
www.plugingalaxy.com
I don't undertand what you do and if that is valid, can you get the CYMK
components?
I don't think so because you need to "extract" the Cyan component (as well
YMK being the last one the ver easy) of the RGB file.
Right?
Giovanni
pd Let me understand something please, you first convert your color file to
a BW or gray scale file and to that file you apply the Red filter, Green
filter and Blu filter and save them. Then you rebuild your COLOR image with
these 3 new layers, does it work?
 
 
----- Original Message -----
From: "philippe berger" <mineurdecharbon@skynet.be>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Saturday, October 30, 2004 11:44 AM
Subject: Réf. : Re: Réf. : RE: CMYK separations on Adobe Photoshop
 
 
Reply-To: "philippe berger" <mineurdecharbon@skynet.be>
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Giovanni,
 
I don' t if my translation is good
With this Plug-in:
1. conversion color to B&W
2. Filter RGB for the separation layers
3. The Plug-in is free
4. It is possible to save the layers (no possible only with Photoshop)
 
I prefer two solution for the work and not only one
 
Philippe
 
 
-------Message original-------
 
De : alt-photo-process-l@sask.usask.ca
Date : Saturday, October 30, 2004 17:32:44
A : alt-photo-process-l@sask.usask.ca
Sujet : Re: Réf. : RE: CMYK separations on Adobe Photoshop
 
Phillipp said:
"But also for this separation, i use a free Plug-in with RGB Filters"
I am missing the point, you are still working on RGB not on CYMK but why do
you use a Plug-in when Photoshop does the perfect separation on RGB?
The point to use sometimes CYMK is that if you really want to get any
specific color on your print and you have not succeded with the 4 layers you
then just select the color, move it to gray scale, buy the exact pigment you
are missing and print it on top.
You can generate endless color of files, meaning you print by "eyesight" or
WYSIWYG (what you see is what you get). If you see a silver color you select
your "silver", grayed, invert and print.
Giovanni
 
 
 
----- Original Message -----
From: "philippe berger" <mineurdecharbon@skynet.be>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Saturday, October 30, 2004 4:57 AM
Subject: Réf. : RE: CMYK separations on Adobe Photoshop
 
 
> Reply-To: "philippe berger" <mineurdecharbon@skynet.be>
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> Also for me, i use the layers RGB of Photoshop in my last book
> http://users.skynet.be/philippe.berger/livregomme.html
> But also for this separation, i use a free Plug-in with RGB Filters
> The separation with this Plug-in is very easy and very good
>
> Sorry for me english
>
> Philippe
> http://users.skynet.be/philippe.berger
>
>
> -------Message original-------
>
> De : alt-photo-process-l@sask.usask.ca
> Date : Saturday, October 30, 2004 10:44:16
> A : alt-photo-process-l@sask.usask.ca
> Sujet : RE: CMYK separations on Adobe Photoshop
>
> You print the Red channel with cyan, the Green with Magenta, and the
> Blue with Yellow.
> It sounds crazy but it's true!!!
> Cheers
> Kate
>
> -----Original Message-----
> From: gdimase@hotmail.com [mailto:gdimase@hotmail.com]
> Sent: Saturday, 30 October 2004 4:48 p.m.
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: CMYK separations on Adobe Photoshop
>
>
> Sorry, but...
> How do you get the Cyan channel from a RGB file without going to CMYK?
> Isn't this the question? How do you get the Cyan colors? Giovanni
>
>
> ----- Original Message -----
> Wrom: ZXUWLSZLKBRNVWWCUFPEGAUTFJMVRESKP
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Friday, October 29, 2004 10:22 AM
> Subject: Re: CMYK separations on Adobe Photoshop
>
>
> > I forgot to mention a fairly obvious thing: once you have the channel
> > saved as a positive grayscale file you have to invert the positive to
> > a negative. This can be done under Image--> Adjustments-->Invert or
> > by having the printer set to invert the files during printing. I also
>
> > flip the image horizontally when printing so that the ink surface is
> > next to the emulsion of the paper.
> >
> > By sheer coincidence, yesterday and today I have been testing
> > separation negatives made for gum printing on a new Epson 2200 printer
>
> > using both the CMYK mode and the RGB method I described earlier. I'll
>
> > scan the prints as soon as they dry today and put them online. Once
> > on the web, I'll post the URL in case you wish to see a visual
> > comparison of the results of both methods.
> >
> > Joe
> >
> > >>> jsmigiel@kvcc.edu 10/29/04 8:56 AM >>> mgalanmolina@hotmail.com
> > >>> 10/29/04 5:57 AM >>>
> > Hi list, there is a easy way, or not easy, to make cmyk separations on
>
> > photoshop other than change image mode to cmyk. I want to obtain the
> > separation channels as layers in order to apply curves over every
> > layer independently and save it as different files.
> >
> > Thanks
> >
> > Manuel, from Spain
> >
> > Wih an RGB file (e.g., image.psd), open the channels window and select
>
> > a channel. For example, select the red channel. Then change the mode
>
> > to grayscale and discard the other channels. At this point, ***be
> > sure to rename the file*** (e.g., image_RED.psd). You now have a
> > grayscale positive of the Red channel and you have the original file
> > still intact. Do the same with the other channels (G+B). Then, using
>
> > the original file, change the mode to grayscale (or desaturate the RGB
>
> > file) and rename it for the black channel.
> >
> > Be aware that this set of negatives will be distorted in terms of
> > color printing characteristics compared to those made using the CMYK
> > mode and selecting those individual channels for negatives. The info
> > preserved just isn't the same, but can be interesting nontheless.
> >
> > Also, why not use the channel mixer (Image-->Adjustments-->Channel
> > Mixer
> > IIRC) to get the effects you desire in RGB and then switch to CMYK and
> > print out the separations?
> >
> > Joe
> >
> >
>
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Received on Sat Oct 30 10:34:02 2004