Determining no of colour plates on a page
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Category: For Users of the Library
Forum Name: General Discussion
Forum Description: Discussion board for Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=2226
Printed Date: 29 Apr 24 at 8:49PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Determining no of colour plates on a page
Posted By: peterbh
Subject: Determining no of colour plates on a page
Date Posted: 12 Apr 12 at 1:08AM
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Is there any way to determine the no of plates (and which ones) that would be generated on output of (a single page) document to a separating RIP ? Further, is there a description of the data returned by GetPageColorSpace, for instance Resource,\"Cs8\",Separation,\"Black\",DeviceCMYK,-1,-1,-1,-1 Resource,\"Cs9\",Separation,\"All\",DeviceCMYK,-1,-1,-1,-1 XObject,\"Im1\",Image,,DeviceCMYK,-1,-1,-1,-1 what is the significance of the -1's ? TIA Peter |
Replies:
Posted By: Ingo
Date Posted: 12 Apr 12 at 7:04AM
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Hi Peter! This is the description from the online reference (i think you know it): "Returns a CSV string containing the list of color spaces defined in the resource tree of the selected page." It's a new (prelimary) functionality with 8.14 - we'll see how it will be enhanced in the future. Please keep in mind: Without ColorSpace-tag it's possible to have a coloured pdf. With a ColorSpace-tag it's possible to have only b/w-pages. It depends on the created structure and the used options from the pdf-creator how the csv-string will look like ;-) Cheers, Ingo |
Posted By: edvoigt
Date Posted: 12 Apr 12 at 1:49PM
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Hi, GetPageColorSpace is a first step on the way to solve your problem. I have the same interests (PDFs usable for plateproduction) too. GetPageColorSpace (and more) was suggested by me. The last four values are CMYKs. -1 is for unknown value. Defining a separationcolor in PDF it is possible to give an advice how for example pantone-colors should be replaced by CMYK. This is a good way to have them approximated on screen (CMYK-->RGB by renderer). Problems:
The main-problem is to ask for all used colors. I am working over a few years on a rather complex program which makes from a short definition of a product (pages, format, kind of binding, amount, content-PDF, machines, papers,...) a jobdefinition (XML+JDF) including PDFs for ripping. In the moment, my produced PDFs are only used as preview. But it shall change. In the future they will be used or ripping in production. So I have to struggle with colors. My imagination is to have a function, which makes a list of colors, where for every color the following properties are available: name of color: string; // external Name for spotcolors, in other cases "RGB" or "CMYK" name of colorspace: string; // empty or Gray, CMYK,... IsSeparation, // defined as IsCMYK, IsRGB, IsLinecolor, // used for IsFillingcolor, IsTextcolor: boolean; smallestlinewidth: double; // very small lines may be unprintable charcounter: integer; // number of chars drawn with this color So with IsRGB it would be clear, this PDF is not for professional printing. So we would get a half preflightcheck. GetPageColorSpace is only a first step. It would interesting to know, how much users of QP would like this things. Cheers, Werner |
Posted By: MarcoAbbate
Date Posted: 26 Mar 15 at 3:34PM
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Hello, I'm struggling with PDF for Pre-Press as well. The CMYK issues are really important for my job. Any suggestion and improvement will be appreciated... Marco. |
Posted By: RWann
Date Posted: 29 Jul 15 at 12:41PM
I'd like a fonction like you described edvoigt  this seems to have not yet been developed... and we need to check all spot color in the PDF upload in our software for printproviders Best regards
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