Re: How can I create PDF with spot color?

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AAA wrote:
> Hi all,
> 
> I am confused. How can I create PDF with spot colors?
> 
> In API2 I only see the following sample code.
> ---------------------------------------------------------------------
> 1    $cy = $pdf->colorspace_separation('Cyan',    '%f000');
> 2    $ma = $pdf->colorspace_separation('Magenta', '%0f00');
> 3    $ye = $pdf->colorspace_separation('Yellow',  '%00f0');
> 4    $bk = $pdf->colorspace_separation('Black',   '%000f');
> 5    $pms023 = $pdf->colorspace_separation('PANTONE 032CV', '%0ff0');
> 6    $dncs = $pdf->colorspace_devicen( [ $cy,$ma,$ye,$bk,$pms023 ] );
> ---------------------------------------------------------------------
> 
> My understanding is line 5 is make a separated colorspace 
> for 'PANTONE 032CV', which is red ('%0ff0') in CMYK.
> 
> What to do next? I did $txt->fillcolor($pms023, 100); but didn't 
> work. 
> 
> thanks a lot.

what you call "spot color" is a "separation colorspace" in pdf-speech.

at first you must know the name of the spot-color your output-device
supports eg "Orange" and an emulation value usually in CMYK eg "%03f0".

looking at example "032_separation" we get:

my $csp=$pdf->colorspace_separation('Orange', '%03f0');

$gfx->fillcolor($csp, $tint);


where $tint ranges from 0.0 to 1.0


DeviceN colorspaces on the other side are usually for Images.


(please note that both colorspaces are "linearly sampled",
so $tint might need to be adjusted for gamma if you know what i mean)


C

fredo
- --
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