Duotones with spot colors

Duotones with spot colors

[Piotr Kopszak]

Hello list,

I am preparing for a next project which will be printed in two
colours. Obviously, perfect opportunity to use duotones. However I got
my duotone illustrations in CMYK tiffs with images in yellow and black
channels. Obviously black could stay but I would like to convert the
yellow channel to the spot colour I am going to use. Any ideas
(without using Photoshop) ?

Many thanks in advance

Piotr
-- 
http://okle.pl
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Re: Duotones with spot colors

[luigi scarso]

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On Tue, Jul 7, 2009 at 3:50 PM, Piotr Kopszak <kopszak@gmail.com> wrote:

> Hello list,
>
> I am preparing for a next project which will be printed in two
> colours. Obviously, perfect opportunity to use duotones. However I got
> my duotone illustrations in CMYK tiffs with images in yellow and black
> channels. Obviously black could stay but I would like to convert the
> yellow channel to the spot colour I am going to use. Any ideas
> (without using Photoshop) ?
>
Did you seen
http://www.libtiff.org



-- 
luigi

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Re: Duotones with spot colors

[Hans Hagen]

Piotr Kopszak wrote:
> Hello list,
> 
> I am preparing for a next project which will be printed in two
> colours. Obviously, perfect opportunity to use duotones. However I got
> my duotone illustrations in CMYK tiffs with images in yellow and black
> channels. Obviously black could stay but I would like to convert the
> yellow channel to the spot colour I am going to use. Any ideas
> (without using Photoshop) ?

as it is possible to colorize bw bitmap images in context i suppose that 
doing the same with a dual channel image is doable as well but i never 
tried is (low on my list of priorities so you're unlicky that we never 
needed that variant in projects)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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___________________________________________________________________________________

Re: Duotones with spot colors

[William Adams]

On Jul 7, 2009, at 9:50 AM, Piotr Kopszak wrote:

> I am preparing for a next project which will be printed in two
> colours. Obviously, perfect opportunity to use duotones. However I got
> my duotone illustrations in CMYK tiffs with images in yellow and black
> channels. Obviously black could stay but I would like to convert the
> yellow channel to the spot colour I am going to use. Any ideas
> (without using Photoshop) ?

Leave the images be, set the things you want to appear in the spot  
colour as yellow, then tell the printer that the yellow plate is the  
spot colour and to suppress cyan and magenta.

Or use the spot colour and tell the printer to merge the yellow plate  
w/ the spot colour (check first --- while all RIPs should be able to  
do this, not all printers will be willing to).

Or use Enfocus PitStop to post-process the .pdf.

However, unless the spot colour is _very_ light, I doubt that you'll  
be able to use the images as is --- they'll probably print too dark,  
so you'll need to process them anyway. I'd make a PhotoShop action to  
convert the images to multi-channel, then change the yellow plate to  
the spot colour, then apply a curve to lighten the spot colour, then  
save the image (but make sure you keep an original), then I'd use a  
second action to review all of the files on a calibrated monitor,  
tweaking as necessary and going back to original images at need.

William


-- 
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.

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___________________________________________________________________________________

Re: Duotones with spot colors

[Piotr Kopszak]

Many thanks for all replies,

Well, maybe someone comes up with a solution one day. It would be nice
to have a complete Photoshop-less production environment on linux.
BTW, can tif support spot colors at all, I haven't found any mention
of that anywhere, hence I don't think libtiff might be of use.

Piotr

2009/7/7 William Adams <will.adams@frycomm.com>:
> On Jul 7, 2009, at 9:50 AM, Piotr Kopszak wrote:
>
>> I am preparing for a next project which will be printed in two
>> colours. Obviously, perfect opportunity to use duotones. However I got
>> my duotone illustrations in CMYK tiffs with images in yellow and black
>> channels. Obviously black could stay but I would like to convert the
>> yellow channel to the spot colour I am going to use. Any ideas
>> (without using Photoshop) ?
>
> Leave the images be, set the things you want to appear in the spot colour as
> yellow, then tell the printer that the yellow plate is the spot colour and
> to suppress cyan and magenta.
>
> Or use the spot colour and tell the printer to merge the yellow plate w/ the
> spot colour (check first --- while all RIPs should be able to do this, not
> all printers will be willing to).
>
> Or use Enfocus PitStop to post-process the .pdf.
>
> However, unless the spot colour is _very_ light, I doubt that you'll be able
> to use the images as is --- they'll probably print too dark, so you'll need
> to process them anyway. I'd make a PhotoShop action to convert the images to
> multi-channel, then change the yellow plate to the spot colour, then apply a
> curve to lighten the spot colour, then save the image (but make sure you
> keep an original), then I'd use a second action to review all of the files
> on a calibrated monitor, tweaking as necessary and going back to original
> images at need.
>
> William
>
>
> --
> William Adams
> senior graphic designer
> Fry Communications
> Sphinx of black quartz, judge my vow.
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>



-- 
http://okle.pl
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Duotones with spot colors

[William Adams]

On Jul 7, 2009, at 1:20 PM, Piotr Kopszak wrote:

> BTW, can tif support spot colors at all, I haven't found any mention
> of that anywhere, hence I don't think libtiff might be of use.


One can only get spot colours for a bitmap into a .eps (or .pdf)  
or .psd.

What one could do using libtiff is split the channels of the file,  
toss magenta and cyan, then use a different tool to composite the two  
bitmaps, assigning the yellow bitmap to the spot colour --- FreeHand  
could do this via scripting, if ConTeXt can place a bitmap on a  
particular spot colour plate and control overprinting of bitmaps, one  
could handle the balance in it.

William

-- 
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.

___________________________________________________________________________________
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Re: Duotones with spot colors

[luigi scarso]

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On Wed, Jul 8, 2009 at 3:39 PM, William Adams <will.adams@frycomm.com>wrote:

> On Jul 7, 2009, at 1:20 PM, Piotr Kopszak wrote:
>
>  BTW, can tif support spot colors at all, I haven't found any mention
>> of that anywhere, hence I don't think libtiff might be of use.
>>
>
>
> One can only get spot colours for a bitmap into a .eps (or .pdf) or .psd.
>
> What one could do using libtiff is split the channels of the file, toss
> magenta and cyan,
>
hmm
how do you do it ?
-- 
luigi

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___________________________________________________________________________________

Re: Duotones with spot colors

[William Adams]

On Jul 8, 2009, at 9:45 AM, luigi scarso wrote:

> On Wed, Jul 8, 2009 at 3:39 PM, William Adams  
> <will.adams@frycomm.com> wrote:
>> What one could do using libtiff is split the channels of the file,  
>> toss magenta and cyan,

> hmm
> how do you do it ?


My apologies, that should have read, ``What one _should_ be able to  
do....''

I would expect to be able to do as I described, but I'm not certain it  
can be done.

William

-- 
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.

___________________________________________________________________________________
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___________________________________________________________________________________

Re: Duotones with spot colors

[Piotr Kopszak]

BTW,

I am not able to get a duotone image with recent minimals in the
example published here:
http://wiki.contextgarden.net/Colors#Colorizing_Grayscale_Pictures


\setuplayout[header=0pt,footer=0pt,width=middle,height=middle,backspace=1cm,topspace=1cm]
\setupcolors[state=start]

\startbuffer
\definecolor [blue]   [c=1, m=.38, y=0, k=.64]
\definecolor [yellow] [c=0, m=.28, y=1, k=.06]

\definespotcolor [blue-100]   [blue]   [p=1]
\definespotcolor [yellow-100] [yellow] [p=1]

\definemultitonecolor [combicolor]   [blue=.12, yellow=.28] [c=.1,
m=.1, y=.3, k=.1]

\definemultitonecolor [combicolor-b] [blue=1]   [c=1, m=.38, y=0,
k=.64] % force multitone
\definemultitonecolor [combicolor-y] [yellow=1] [c=0, m=.28, y=1,
k=.06] % force multitone

\useexternalfigure[demo-a][mill.png]     [object=no, width=.2\textwidth]
\useexternalfigure[demo-b][hacker-bw.jpg][object=no, width=.2\textwidth]

\startbaselinecorrection
\startcombination[4*1]
 {\externalfigure[demo-a]}                                {no color}
 {\externalfigure[demo-a][color=combicolor]}   {indexed duotone}
 {\externalfigure[demo-a][color=combicolor-b]} {spot color}
 {\externalfigure[demo-a][color=combicolor-y]} {spot color}
\stopcombination
\stopbaselinecorrection

\startbaselinecorrection
\startcombination[4*1]
 {\externalfigure[demo-b]}                     {no color}
 {\externalfigure[demo-b][color=combicolor]}   {indexed duotone}
 {\externalfigure[demo-b][color=combicolor-b]} {spot color}
 {\externalfigure[demo-b][color=combicolor-y]} {spot color}
\stopcombination
\stopbaselinecorrection

\startbaselinecorrection
\startcombination[4*1]
 {\externalfigure[demo-a]}                     {no color}
 {\externalfigure[demo-a][color=combicolor]}   {indexed duotone}
 {\externalfigure[demo-a][color=blue-100]}     {spot color}
 {\externalfigure[demo-a][color=yellow-100]}   {spot color}
\stopcombination
\stopbaselinecorrection

\startbaselinecorrection
\startcombination[4*1]
 {\externalfigure[demo-b]}                     {no color}
 {\externalfigure[demo-b][color=combicolor]}   {indexed duotone}
 {\externalfigure[demo-b][color=blue-100]}     {spot color}
 {\externalfigure[demo-b][color=yellow-100]}   {spot color}
\stopcombination
\stopbaselinecorrection
\stopbuffer

\getbuffer \typebuffer

\stoptext


The images in the column "indexed duotone" do not show up.

Piotr

2009/7/7 Hans Hagen <pragma@wxs.nl>:
> Piotr Kopszak wrote:
>>
>> Hello list,
>>
>> I am preparing for a next project which will be printed in two
>> colours. Obviously, perfect opportunity to use duotones. However I got
>> my duotone illustrations in CMYK tiffs with images in yellow and black
>> channels. Obviously black could stay but I would like to convert the
>> yellow channel to the spot colour I am going to use. Any ideas
>> (without using Photoshop) ?
>
> as it is possible to colorize bw bitmap images in context i suppose that
> doing the same with a dual channel image is doable as well but i never tried
> is (low on my list of priorities so you're unlicky that we never needed that
> variant in projects)
>
> Hans
>
>
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>



-- 
http://okle.pl
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___________________________________________________________________________________

Re: Duotones with spot colors

[Hans Hagen]

Piotr Kopszak wrote:
> BTW,
> 
> I am not able to get a duotone image with recent minimals in the
> example published here:
> http://wiki.contextgarden.net/Colors#Colorizing_Grayscale_Pictures

the current public version of mkiv does not provide it (beta does but 
that one is not yet posted)

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Duotones with spot colors

[Piotr Kopszak]

I can't get it right with mkii and xetex either.

Piotr

2009/7/9 Hans Hagen <pragma@wxs.nl>:
> Piotr Kopszak wrote:
>>
>> BTW,
>>
>> I am not able to get a duotone image with recent minimals in the
>> example published here:
>> http://wiki.contextgarden.net/Colors#Colorizing_Grayscale_Pictures
>
> the current public version of mkiv does not provide it (beta does but that
> one is not yet posted)
>
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>



-- 
http://okle.pl
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___________________________________________________________________________________

Re: Duotones with spot colors

[Hans Hagen]

Piotr Kopszak wrote:
> I can't get it right with mkii and xetex either.

forget about xetex; mkii uses a pdftex feature (access to resource dict)


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Duotones with spot colors

[Piotr Kopszak]

Yes, but I don't arrive at expected results with pdftex either.

Piotr

2009/7/9 Hans Hagen <pragma@wxs.nl>:
> Piotr Kopszak wrote:
>>
>> I can't get it right with mkii and xetex either.
>
> forget about xetex; mkii uses a pdftex feature (access to resource dict)
>
>
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>



-- 
http://okle.pl
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