RE: CMYK again
Hi, What you could do to output CMYK to pdf is to change the org.apache.fop.renderer.pdf.PDFRenderer. You could implement your own PDFRenderer as a copy and map some rgb-values to cmyk-values (via look-up-table or sth.) But the problem is here, that you must change quite a bit since there are no setColor... methods or something. This could be a hack that is not that complicated as the PDF-patch hack where you must recode the XRef-table. Just my 2ct. Christian -Original Message- From: Timo Haberkern [mailto:[EMAIL PROTECTED] Sent: Friday, November 21, 2003 9:44 AM To: [EMAIL PROTECTED] Subject: CMYK again Hi all, i read the last threads about cmyk for FOP, but it seems that there was no solution for the problems. If i read all the messages completely there is the following status: 1.) FOP (or XSL:FO) doesn't support CMYK directly 2.) CMYK JPEGs shouldn't be a problem in FOP through JAI support 3.) Ben Galbraith suggested a solution replacing the RGB commands rg/RG with CMYK k/K for every PDF object and mentioned a self-written tool for doing that task. 4.) Someone mentioned to do this replacement in the output method in PDFDocument.java, but it seems nobody has tried it so far. My problem is that i will need CMYK support in the near future and i'm not the big coder, so i think i have no chance to do hacking FOP to my needs. But i think there are more people like me who want to create CMYK documents with FOP. Maybe it is possible to create a wiki for this topic, so we get a complete way how to solve this problem? Ben: How about release your mentioned tool as open source? Any ideas about that? A question to the FOP coding gurus: What would be the correct/best way to implement an extension to FOP that can generate a CMYK document? rgds Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Timo, Timo Haberkern wrote: 1.) FOP (or XSL:FO) doesn't support CMYK directly I don't know if the XSL-FO color space support supports CMYK or not. Others may comment on this who have read the spec more than I. 2.) CMYK JPEGs shouldn't be a problem in FOP through JAI support I use CMYK JPEGs in FOP all the time. Ben: How about release your mentioned tool as open source? The President of my employer is a lawyer. Dunno if open-source will happen anytime soon for that lib. ;-) Have you checked if the open-source Multivalent lib supports this type of operation? I'll try and take a gander too, but you should check and see. Ben - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Ben, The President of my employer is a lawyer. Dunno if open-source will happen anytime soon for that lib. ;-) Have you checked if the open-source Multivalent lib supports this type of operation? I'll try and take a gander too, but you should check and see. I will check it next week. Thanks for the tip. I think it should be possible to create cmyk pdf from FOP directly. So if you can't open-source your solution, maybe you can talk a little bit about how to do such a replacement, so that i can maybe hack something similar into FOP? Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: CMYK again
Well, in FOP 0.20.5 it is possible to generate uncompressed PDF documents. Although this may increase the file size, sometimes dramatically, it makes the RGB-CMYK replace operation much simpler, Because the PDF document wont need to be decompressed before performing those tasks. Then, what you will need is a regular expression, that finds any 'RG' or 'rg' color commands, to replace them with 'K' or 'k', respectively. Of course, the expression needs to be smart enough only to replace occurrences of 'RG' or 'rg' that is actually color commands. Searching for occurrences of three space separated numbers followed by space and then 'RG' or 'rg' is a hack, that might (but only might) be good enough. Then, the XRef Table needs to be rebuilt. This tasks should be possible to do with another regular expression, That searches for any occurrences of '[anInteger] [anotherInteger] obj' and adds the byte offset positions of these matches into a new XRef Table, that in the end should replace the existing XRef Table. Also, the number on the second last line of the document should be replaced with the number of bytes written until the occurrence of the last 'endobj' command. There is a number of plug-ins, that can be used from within Adobe Reader to convert the RGB colors of a PDF document into CMYK colors. There is a tool named QuiteABoxOfTricks that can be found at http://www.quite.com doing this. I am sure it is possible to setup a batch processing solution as well, in order to create a totally automated hack solution for this lack. PitStop server is another solution. Regards, Dennis JD Myrén Developer Tel: (+47) 98 00 11 92 Mail: [EMAIL PROTECTED] Web: www.oslokb.no -Original Message- From: Timo Haberkern [mailto:[EMAIL PROTECTED] Sent: 21. november 2003 14:38 To: [EMAIL PROTECTED] Subject: Re: CMYK again Ben, The President of my employer is a lawyer. Dunno if open-source will happen anytime soon for that lib. ;-) Have you checked if the open-source Multivalent lib supports this type of operation? I'll try and take a gander too, but you should check and see. I will check it next week. Thanks for the tip. I think it should be possible to create cmyk pdf from FOP directly. So if you can't open-source your solution, maybe you can talk a little bit about how to do such a replacement, so that i can maybe hack something similar into FOP? Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Then, what you will need is a regular expression, that finds any 'RG' or 'rg' color commands, to replace them with 'K' or 'k', respectively. Of course, the expression needs to be smart enough only to replace occurrences of 'RG' or 'rg' that is actually color commands. Searching for occurrences of three space separated numbers followed by space and then 'RG' or 'rg' is a hack, that might (but only might) be good enough. Ok, i understood that. But i think the color values must be changed too or i'm wrong. I think there must be a conversion from rgb to cmyk values?!? Then, the XRef Table needs to be rebuilt. This tasks should be possible to do with another regular expression, That searches for any occurrences of '[anInteger] [anotherInteger] obj' and adds the byte offset positions of these matches into a new XRef Table, that in the end should replace the existing XRef Table. Sorry don't understand that. For what is this task? Timo Also, the number on the second last line of the document should be replaced with the number of bytes written until the occurrence of the last 'endobj' command. There is a number of plug-ins, that can be used from within Adobe Reader to convert the RGB colors of a PDF document into CMYK colors. There is a tool named QuiteABoxOfTricks that can be found at http://www.quite.com doing this. I am sure it is possible to setup a batch processing solution as well, in order to create a totally automated hack solution for this lack. PitStop server is another solution. Regards, Dennis JD Myrén Developer Tel: (+47) 98 00 11 92 Mail: [EMAIL PROTECTED] Web: www.oslokb.no -Original Message- From: Timo Haberkern [mailto:[EMAIL PROTECTED] Sent: 21. november 2003 14:38 To: [EMAIL PROTECTED] Subject: Re: CMYK again Ben, The President of my employer is a lawyer. Dunno if open-source will happen anytime soon for that lib. ;-) Have you checked if the open-source Multivalent lib supports this type of operation? I'll try and take a gander too, but you should check and see. I will check it next week. Thanks for the tip. I think it should be possible to create cmyk pdf from FOP directly. So if you can't open-source your solution, maybe you can talk a little bit about how to do such a replacement, so that i can maybe hack something similar into FOP? Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] . -- Grüsse Timo Haberkern EMEDIA OFFICE GmbH Wingertstr. 4 74850 Schefflenz-Kl. http://www.emedia-office.com [EMAIL PROTECTED] Tel.: 06293/921121 Fax: 06293/921129 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Timo Haberkern wrote: Ok, i understood that. But i think the color values must be changed too or i'm wrong. I think there must be a conversion from rgb to cmyk values?!? Right. I haven't created code that performs intelligent RGB - CMYK conversion; rather, I replace specific RGB values with specific CMYK values based on decisions we've made ahead of time. Sorry don't understand that. For what is this task? A PDF file is a series of objects, each of which contains instructions for how it should be rendered. At the end of the PDF is a reference table indicating the byte offset of each object. To save space, each object can be compressed using a few different methods. To modify the object's contents, the object must be decompressed. Because decompressing an object changes its size, the reference table must be updated when the object is decompressed. A tool such as Multivalent can take care of this for you (although as I've said previously, I had problems with it when I tried it; many others have not had problems). Once the objects have been decompressed, you can perform a search and replace operation -- BUT, because the replace operation will likely change the size of the objects, you should use a tool that rewrites the reference table. The text you need to replace has this general syntax: [red value] [green value] [blue value] rg or [red value] [green value] [blue value] RG You'll need to replace it with: [cyan] [magenta] [yellow] [black] k and: [cyan] [magenta] [yellow] [black] K respectively. Note that the color values are decimals, not integers. So, 255 = 1.0, 127 = 0.5, etc. Note, that as others have said, going to all this trouble only makes sense if you really need your code to do this. Other tools exist that can automate this process for you via a GUI, etc. So, check if Multivalent can do this. If it can, great. If not, check for other libs -- I'm told several exist. If you decide to get your own hands dirty, while I do not have permission to give you the code, I can offer a steady supply of advice. I've had a few requests for my lib, so I'll check again and see if I can get it released, since a PDF lib isn't neither innovative or proprietary. Ben Timo Also, the number on the second last line of the document should be replaced with the number of bytes written until the occurrence of the last 'endobj' command. There is a number of plug-ins, that can be used from within Adobe Reader to convert the RGB colors of a PDF document into CMYK colors. There is a tool named QuiteABoxOfTricks that can be found at http://www.quite.com doing this. I am sure it is possible to setup a batch processing solution as well, in order to create a totally automated hack solution for this lack. PitStop server is another solution. Regards, Dennis JD Myrén Developer Tel: (+47) 98 00 11 92 Mail: [EMAIL PROTECTED] Web: www.oslokb.no -Original Message- From: Timo Haberkern [mailto:[EMAIL PROTECTED] Sent: 21. november 2003 14:38 To: [EMAIL PROTECTED] Subject: Re: CMYK again Ben, The President of my employer is a lawyer. Dunno if open-source will happen anytime soon for that lib. ;-) Have you checked if the open-source Multivalent lib supports this type of operation? I'll try and take a gander too, but you should check and see. I will check it next week. Thanks for the tip. I think it should be possible to create cmyk pdf from FOP directly. So if you can't open-source your solution, maybe you can talk a little bit about how to do such a replacement, so that i can maybe hack something similar into FOP? Timo - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] . - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Ben Galbraith wrote: I don't know if the XSL-FO color space support supports CMYK or not. XSLFO only supports sRGB (gamma corrected!) and ICC colors. Of course, the spec doesn'n mention how the colors in the output should look like. J.Pietschmann - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Timo Haberkern wrote: A question to the FOP coding gurus: What would be the correct/best way to implement an extension to FOP that can generate a CMYK document? Check whether iText or any other of the handful of PDF libraries on sourceforge can help you with this problem. J.Pietschmann - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: CMYK again
Timo Haberkern wrote: A question to the FOP coding gurus: What would be the correct/best way to implement an extension to FOP that can generate a CMYK document? rgds Timo Here're a couple of ideas of where to look: EXSLFO Project: http://exslfo.sourceforge.net/ EXSLFO Project Home: https://sourceforge.net/projects/exslfo/ which appears to be an extension of: http://exslt.org/ Good luck! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
