Re: [iText-questions] Problem with transparent images
2008/2/21, Eliot M Cline [EMAIL PROTECTED]: The only way I could keep acrobat reader from changing the color space to CMYK was to set the entire page containing our graphics to a transparency group and then set the colorspace accordingly. See the VB code snippet below. Great! That worked. Thank you, Stephan. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
Bruno/Paulo - can you guys please add this as a higher level API call (say, on a PdfPage) for the future? Thanks, Leonard On Feb 20, 2008, at 7:45 PM, Eliot M Cline wrote: 2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. You need to set the COLORSPACE to DeviceRGB... Thanks, but how can I achieve it? I tried 1. ImgTemplate image2 = new ImgTemplate(template); PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.DEVICERGB); PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, colorspace); image2.setAdditional(ad); 2. PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, PdfName.DEVICERGB); image2.setAdditional(ad); Stephan, We struggled with this problem for a long time too. Our situation was slightly different than yours in that we make heavy use of transparency with vector graphics as opposed to transparent images. The only way I could keep acrobat reader from changing the color space to CMYK was to set the entire page containing our graphics to a transparency group and then set the colorspace accordingly. See the VB code snippet below. Dim pp As PdfDictionary = New PdfDictionary pp.Put(PdfName.TYPE, PdfName.GROUP) pp.Put(PdfName.S, PdfName.TRANSPARENCY) pp.Put(PdfName.CS, PdfName.DEVICERGB) doc.Open() Dim cb As PdfContentByte = writer.DirectContent Dim tp As PdfTemplate = cb.CreateTemplate(x, y) 'Include the below immediately after a doc.NewPage() or after creating a new doc as above cb.PdfWriter.Group = pp cb.SetDefaultColorspace(PdfName.CS, PdfName.DEVICERGB) tp.SetDefaultColorspace(PdfName.CS, PdfName.DEVICERGB) 'Not sure if this one is necessary Anyway, this works for us. Maybe it will be of some help to you as well. Cheers, Eliot Cline Sent with DeskNow Lite - Free mail groupware server http:// www.desknow.com -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
Stephan Michels wrote: The Acrobat Reader seems to mix or change colors, which are used in a page if I use a image with an alpha channel. I tracked down the problem to the method Image.getInstance(java.awt.Image, java.awt.Color, boolean). The problem occurs if the method sets the ImageMask. I made following screenshots to show the problem: I'm not sure what I'm supposed to see. In one screen there's a thicker border than in the other three screens. I guess that's your problem, but... I don't know what you are doing. Have you read the following remark about transparency: http://www.nabble.com/Re%3A-PDFStamper%3A-Color-of-text-in-PDF-changes-when-replacing-button-with-PNG-Image-p15485315.html Adobe Reader is probably the only viewer that deals more or less correctly with transparency. Hardly any other viewer blends transparent layers correctly. So my first guess would be that the problem doesn't lie with Adobe Reader or iText, but with Evince. (And if Evince shows the desired PDF, then the problem lies probably with your code.) -- This answer is provided by 1T3XT BVBA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
2008/2/20, 1T3XT info [EMAIL PROTECTED]: Stephan Michels wrote: I made following screenshots to show the problem: I'm not sure what I'm supposed to see. In one screen there's a thicker border than in the other three screens. I guess that's your problem, but... I don't know what you are doing. Yes, the thicker border is an additional problem. The problem is that you see different colors in the second screenshot than I have used to generate the PDF. You see the desired output on the right side within Evince. Have you read the following remark about transparency: http://www.nabble.com/Re%3A-PDFStamper%3A-Color-of-text-in-PDF-changes-when-replacing-button-with-PNG-Image-p15485315.html Good point, that the Acrobat Reader changes the colors to the CMYK color space was one of my assumptions. Hmm, so what can I do? How I can prevent that the Acrobat Reader change to the CMYK color space? Stephan Michels. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
On Feb 20, 2008, at 3:26 AM, Stephan Michels wrote: Good point, that the Acrobat Reader changes the colors to the CMYK color space was one of my assumptions. Hmm, so what can I do? How I can prevent that the Acrobat Reader change to the CMYK color space? Tell the PDF consumer what colorspace to use by explicitly setting the transparency blending space! Leonard - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: On Feb 20, 2008, at 3:26 AM, Stephan Michels wrote: Good point, that the Acrobat Reader changes the colors to the CMYK color space was one of my assumptions. Hmm, so what can I do? How I can prevent that the Acrobat Reader change to the CMYK color space? Tell the PDF consumer what colorspace to use by explicitly setting the transparency blending space! And how can I set the default transparency blending space with itext? Or doesn't exist such option in PDF? Can I change this in Acrobat? Can I use the method PdfWriter.setDefaultColorspace() for that? Thanks, Stephan. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
On Feb 20, 2008, at 7:59 AM, Stephan Michels wrote: 2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: Tell the PDF consumer what colorspace to use by explicitly setting the transparency blending space! And how can I set the default transparency blending space with itext? There is an API somewhere - but I'll let Bruno answer with the specifics... Or doesn't exist such option in PDF? Of course it does - that's the whole point! You didn't specify anything in your PDF, so the PDF consumer gets to choose. Can I change this in Acrobat? Nope - Acrobat is just following the rules in the PDF Reference. Leonard - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
Stephan Michels wrote: And how can I set the default transparency blending space with itext? This is explained in chapter 12 of iText in Action. Some pseudocode (so that you can Google for the keywords): PdfGState gs = new PdfGState(); gs.setBlendMode(choose state); cb.setState(gs); With cb a PdfContentByte instance (for instance a PdfTemplate). -- This answer is provided by 1T3XT BVBA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
On Feb 20, 2008, at 9:28 AM, Stephan Michels wrote: 2008/2/20, 1T3XT info [EMAIL PROTECTED]: Stephan Michels wrote: And how can I set the default transparency blending space with itext? Some pseudocode (so that you can Google for the keywords): PdfGState gs = new PdfGState(); gs.setBlendMode(choose state); cb.setState(gs); Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. You need to set the COLORSPACE to DeviceRGB... Leonard - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
2008/2/20, 1T3XT info [EMAIL PROTECTED]: Stephan Michels wrote: And how can I set the default transparency blending space with itext? Some pseudocode (so that you can Google for the keywords): PdfGState gs = new PdfGState(); gs.setBlendMode(choose state); cb.setState(gs); Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. I made a little test class to reproduce the problem: http://www.filespace.net/?d=A867FB691 And also a screenshot to compare the results: http://www.filespace.net/?d=2D877E011 I understand why the border is thinner in the alpha version and the black background of the non-alpha version. What I don't understand is why Acrobat change the text and the border color. Stephan. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. You need to set the COLORSPACE to DeviceRGB... Thanks, but how can I achieve it? I tried 1. ImgTemplate image2 = new ImgTemplate(template); PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.DEVICERGB); PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, colorspace); image2.setAdditional(ad); 2. PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, PdfName.DEVICERGB); image2.setAdditional(ad); Without luck. Stephan. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
You need to put the colorspace into the blending space that you were workign with before... Look at the PDF Reference for details on page blending spaces... Leonard On Feb 20, 2008, at 10:32 AM, Stephan Michels wrote: 2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. You need to set the COLORSPACE to DeviceRGB... Thanks, but how can I achieve it? I tried 1. ImgTemplate image2 = new ImgTemplate(template); PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.DEVICERGB); PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, colorspace); image2.setAdditional(ad); 2. PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, PdfName.DEVICERGB); image2.setAdditional(ad); Without luck. Stephan. -- --- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
Re: [iText-questions] Problem with transparent images
2008/2/20, Leonard Rosenthol [EMAIL PROTECTED]: Hmm, doesn't help :-( I tried every blend mode, but this doesn't prevent Acrobat from switching to the CMYK color space. You need to set the COLORSPACE to DeviceRGB... Thanks, but how can I achieve it? I tried 1. ImgTemplate image2 = new ImgTemplate(template); PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.DEVICERGB); PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, colorspace); image2.setAdditional(ad); 2. PdfDictionary ad = new PdfDictionary(); ad.put(PdfName.COLORSPACE, PdfName.DEVICERGB); image2.setAdditional(ad); Stephan, We struggled with this problem for a long time too. Our situation was slightly different than yours in that we make heavy use of transparency with vector graphics as opposed to transparent images. The only way I could keep acrobat reader from changing the color space to CMYK was to set the entire page containing our graphics to a transparency group and then set the colorspace accordingly. See the VB code snippet below. Dim pp As PdfDictionary = New PdfDictionary pp.Put(PdfName.TYPE, PdfName.GROUP) pp.Put(PdfName.S, PdfName.TRANSPARENCY) pp.Put(PdfName.CS, PdfName.DEVICERGB) doc.Open() Dim cb As PdfContentByte = writer.DirectContent Dim tp As PdfTemplate = cb.CreateTemplate(x, y) 'Include the below immediately after a doc.NewPage() or after creating a new doc as above cb.PdfWriter.Group = pp cb.SetDefaultColorspace(PdfName.CS, PdfName.DEVICERGB) tp.SetDefaultColorspace(PdfName.CS, PdfName.DEVICERGB) 'Not sure if this one is necessary Anyway, this works for us. Maybe it will be of some help to you as well. Cheers, Eliot Cline- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
[iText-questions] Problem with transparent images
Hi, I have a problem with the Adobe Acrobat Reader and PDFs generated by iText. The Acrobat Reader seems to mix or change colors, which are used in a page if I use a image with an alpha channel. I tracked down the problem to the method Image.getInstance(java.awt.Image, java.awt.Color, boolean). The problem occurs if the method sets the ImageMask. I made following screenshots to show the problem: Comparison with a non-transparent image (Evince left, Adobe Acrobat 8.1.1 right): http://www.filespace.net/?d=771E9FB31 Comparison with a transparent image (Evince left, Adobe Acrobat 8.1.1 right): http://www.filespace.net/?d=669C21161 I don't know if it is a problem of the Acrobat Reader or iText. The problem doesn't happen in Evince. Does anyone see this problem before? Thank you, Stephan Michels. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
