count color and grayscale pages in a PDF

[tz8]

Hi,



is there an easy way with switch's own scripting capabilities to count all color and non-color pages from a document or is this out of switch's own FileStatistics capabilities?



Cheers,



Thorsten

[dkelly]

Hello, this is beyond the capabilities of Switch's Statistics which only collects a summary of the colors used by ALL of that PDF pages. Additionally, it only reports Separation, DeviceN, Indexed and NColor -- not the colorants used by those complex color types. For example, you can have a Separation of "Black" which is the same as DeviceGray.



Use Apago's PDFspy to get accurate color usage per page and document.



Dwight Kelly

Apago, Inc.

dkelly@apago.com

[tz8]

do you have an example scripting to do this? And can i actually test it with the trial version? If this would help our production process i'd happily spend the money for the PDFspy

[dkelly]

Yes we can provide both a trial license and some example Switch JS scripts for using PDFspy with Switch. Please send an email to support@apago.com and we will send you the information on Monday.

[dkelly]

Here's a complex scripting example of using Apago's PDFspy to determine if a PDF is black only or contains any type of color. Files are sent to the "success" connection if black only (DeviceGray, Separation Black, K-only DeviceCMYK, DeviceN Black, or Indexed black). Otherwise, file is routed to the "error" connection.



// Determine if a PDF file contains black colors only.

// Copyright (C) 2012 by Apago, Inc.

// All rights reserved.



function jobArrived( s : Switch, job : Job )

{

var pdfInfo = job.getDataset("Pdf");

if (pdfInfo != null) {

var bBlackOnly = true;

var theNumberofColors = pdfInfo.evalToNumber( "count(/pdfattrs/colors/*)", null);

s.log( 1, "There are " + theNumberofColors + " colors defined in PDF");

var i;

for (i=1; i<=theNumberofColors; i++) {

var theColorValue = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/@base", null );

if (theColorValue == "Separation") {

var theSepName = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]", null );

s.log(1, "found Separation " + theSepName);

if (theSepName != "Black") {

s.log(1, "Separation " + theSepName + " isn't black");

bBlackOnly = false

}



} else if (theColorValue == "DeviceN") {

var theNumberofChannels = pdfInfo.evalToNumber( "count(/pdfattrs/colors/color[+i+]/*)", null);

var theSepName = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/color[1]", null );

s.log(1, "found DeviceN(" + theNumberofChannels + ") " + theSepName);

if (theNumberofChannels != 1 || theSepName != "Black") {

s.log(1, "DeviceN: " + theNumberOfChannels + " colors or " + theSepName + " isn't Black");

bBlackOnly = false

}



} else if (theColorValue == "ICCBased") {

var theNumberofChannels = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/@comps", null);

s.log(1, "found ICCBased(" + theNumberofChannels + ")");

if (theNumberofChannels != "1")

bBlackOnly = false;



} else if (theColorValue == "Indexed") {

var theColorValue = pdfInfo.evalToString( "/pdfattrs/colors/color[+i+]/color[1]/@base", null);

if (theColorValue == "Separation") {

var theSepName = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]", null );

s.log(1, "found Indexed Separation " + theSepName);

if (theSepName != "Black") {

s.log(1, "Separation " + theSepName + " isn't black");

bBlackOnly = false

}

} else if (theColorValue == "DeviceN") {

var theNumberofChannels = pdfInfo.evalToNumber( "count(/pdfattrs/colors/color[+i+]/color[1]/*)", null);

var theSepName = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/color[1]/color[1]", null );

s.log(1, "found Indexed DeviceN(" + theNumberofChannels + ") " + theSepName);

if (theNumberofChannels != 1 || theSepName != "Black") {

s.log(1, "DeviceN: " + theNumberOfChannels + " colors or " + theSepName + " isn't Black");

bBlackOnly = false

}

} else if (theColorValue == "ICCBased") {

var theNumberofChannels = pdfInfo.evalToNumber( "/pdfattrs/colors/color[ + i + ]/color[1]/@comps", null);

s.log(1, "found Indexed ICCBased(" + theNumberofChannels + ")");

if (theNumberofChannels != 1)

bBlackOnly = false;



} else if (theColorValue == "DeviceCMYK") {

var theUsedColors = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/color[1]/@used", null );

s.log(1, "found Indexed DeviceCMYK used="+theUsedColors);

if (theUsedColors != "K")

bBlackOnly = false

} else if (theColorValue == "DeviceGray") {

s.log(1, "found Indexed DeviceGray");

} else

bBlackOnly = false;



} else if (theColorValue == "DeviceCMYK") {

var theUsedColors = pdfInfo.evalToString( "/pdfattrs/colors/color[ + i + ]/@used", null );

s.log(1, "found DeviceCMYK used="+theUsedColors);

if (theUsedColors != "K")

bBlackOnly = false



} else if (theColorValue == "DeviceGray") {

s.log(1, "found DeviceGray");

} else

bBlackOnly = false;

}



if (bBlackOnly) {

s.log(1, "PDF contains only black");

job.sendToData( 1, job.getPath() );

} else {

s.log(1, "PDF contains color");

job.sendToData( 3, job.getPath() );

}

} else {

job.fail("No pdfspy metadata found!");

}

}