Color Separation with external figures and spot colors

Color Separation with external figures and spot colors

[Pearson, Mark (Capita Symonds)]

Hi All,

Does anyone know if/how I can take a grayscale JPG external
figure and assign it to a spot colour channel.

The Color Separation manual gives the following example:

\externalfigure[graphic][split=c]

for assigning such an image to the Cyan channel but I want
to say something like:

\definecolor
	[Spot1]
	[c=1,m=.05,y=0,k=.47,e=PANTONE 308 CV]

\definecolor
	[Spot2]
	[c=.69,m=.07,y=0,k=0,e=PANTONE 298 CV]
.
.

\externalfigure[graphic][split=Spot1]

Is this possible?

Thanks in advance for any help anyone can offer :)

Mark Pearson.


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Re: Color Separation with external figures and spot colors

[Hans Hagen]

Pearson, Mark (Capita Symonds) wrote:

>Hi All,
>
>Does anyone know if/how I can take a grayscale JPG external
>figure and assign it to a spot colour channel.
>
>The Color Separation manual gives the following example:
>
>\externalfigure[graphic][split=c]
>
>for assigning such an image to the Cyan channel but I want
>to say something like:
>
>\definecolor
>	[Spot1]
>	[c=1,m=.05,y=0,k=.47,e=PANTONE 308 CV]
>
>\definecolor
>	[Spot2]
>	[c=.69,m=.07,y=0,k=0,e=PANTONE 298 CV]
>.
>.
>
>\externalfigure[graphic][split=Spot1]
>
>Is this possible?
>  
>
this non trivial feature is magically present -)

\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]

\definecolor [blue-100]   [blue]   [p=1]
\definecolor [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