I need this solution, not yet found any alternatives to the pdfbox or PDF
renderer.
with these two I still can not get all the images within a PDF
if you can help, thank you very much!
Mike Marchywka-2 wrote:
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>> Date: Tue, 23 Feb 2010 06:52:54 -0800
>> From: fernandogomes...@hotmail.com
>> To: itext-questions@lists.sourceforge.net
>> Subject: Re: [iText-questions] Using Images extracted from a pdf
>>
>>
>> can anyone help-me one more time..
>> i dont know what i do ..
>>
>> I need to get the image bytes, now decoded...
>
> probably the open source pdf renderer would answer your questions and
> provide
> more context. I seem to recall it was pretty easy to modify to extract
> page images
> in your favorite format, probably in process of rendering the included
> images
> are extracted etc.
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>>
>> String colorSpace = pdfStrem.get(PdfName.COLORSPACE).toString();
>>> String filter = pdfStrem.get(PdfName.FILTER).toString();
>>> int bits =
>>> Integer.valueOf(pdfStrem.get(PdfName.BITSPERCOMPONENT).toString());
>>> int width =
>>> Integer.valueOf(pdfStrem.get(PdfName.WIDTH).toString());
>>> int height =
>>> Integer.valueOf(pdfStrem.get(PdfName.HEIGHT).toString());
>>> PdfDictionary param =
>>> (PdfDictionary)pdfStrem.get(PdfName.DECODEPARMS);
>>> int colors =
>>> Integer.valueOf(param.get(PdfName.COLORS).toString());
>>> int predictor =
>>> Integer.valueOf(param.get(PdfName.PREDICTOR).toString());
>>> int colums =
>>> Integer.valueOf(param.get(PdfName.COLUMNS).toString());
>>> if(filter.equals("/FlateDecode"))
>>> {
>>> byte[] bytesDecod = PdfReader.FlateDecode(bytes);
>>
>> these are all the information that I can withdraw PDF
>>
>> I have to do to create my image in general ..
>> I'm trying to do, or learn, but this hard, all my attempts have failed.
>> ty
>>
>>
>> Fernando Gomes wrote:
>>>
>>> Sirs, really sorry for duplicating, can delete other topics ?
>>> so sorry ..:blush:
>>>
>>> very thkx for help..
>>> and so good fast help ..
>>> i will estudy more ..
>>>
>>>
>>> Leonard Rosenthol-3 wrote:
>>>>
>>>> You are assuming that PDF maintains the PNG nature of the image - that
>>>> is
>>>> NOT the case. PDF only supports two kinds of images JPEG (which is why
>>>> this works) and "raw bitmaps" (aka an array of bits). So in your case,
>>>> with the PNG, it is transcoded into the latter case and so if you want
>>>> it
>>>> back you will need to reverse the process on your end.
>>>>
>>>
>>>
>>> for this response in other same email :blush:
>>> quote of "1T3XT info" below ..
>>>
>>> really thanks. I must have seen the realance the chapter that you
>>> mentioned, I will read again and very carefully. My English is very
>>> weak,
>>> and it is very difficult to read.
>>>
>>> you are very funny, I laughed a lot. I know I deserved the scolding.
>>> Really thanks for your help. I will test and then come back to post the
>>> result.
>>> Thank you!
>>>
>>>
>>> 1T3XT info wrote:
>>>>
>>>> Fernando Henrique Gomes wrote:
>>>>> the problem is when I insert an image in PNG format and then try to
>>>>> get
>>>>> the same...
>>>>
>>>> OK, we're talking about a PNG.
>>>> If you've read chapter 10 of the 2nd edition of "iText in Action",
>>>> you know that PNGs are transformed into zipped pixels.
>>>> If you didn't know, you should read the book!
>>>>
>>>>> on here i try to take that image...
>>>>>
>>>>> [code]
>>>>> int XrefIndex =((PRIndirectReference)obj).getNumber();
>>>>> PdfObject pdfObj = pdf.getPdfObject(XrefIndex);
>>>>> PdfStream pdfStrem = (PdfStream)pdfObj;
>>>>> byte[] bytes =
>>>>> PdfReader.getStreamBytesRaw((PRStream)pdfStrem);
>>>>> if ((bytes != null)) {
>>>>> String fileName = "Image_P"+pageNumber+"_";
>>>>> File file = new File(fileName);
>>>>> FileOutputStream fw = new FileOutputStream(file);
>>>>> fw.write(bytes);
>>>>> fw.flush();
>>>>> fw.close();
>>>>> BufferedImage img2 = ImageIO.read(file);
>>>>> com.lowagie.text.Image img =
>>>>> com.lowagie.text.Image.getInstance(file.toURL());
>>>>> }
>>>>> [/code]
>>>>>
>>>>> img2 returned a null !!!!
>>>>
>>>> Of course, why do you think that would work???
>>>>
>>>>> in line of img .. has a Excpetion
>>>>> "Image_P1_ is not a recognized imageformat"
>>>>
>>>> Of course, you're sending iText a bunch of pixels,
>>>> but: what are the dimensions of the image,
>>>> how many bits are there per component?
>>>>
>>>>> when i try to do :
>>>>> [code]
>>>>> Image image = Toolkit.getDefaultToolkit().createImage(bytes);
>>>>> [code]
>>>>>
>>>>> and before create an image from this image getting the width and
>>>>> height
>>>>> from my PdfStream (create a buffered and draw the image)
>>>>> when i serialize on a file and visualize this.. this image in a
>>>>> fucking
>>>>> black picture .. all black -.-
>>>>
>>>> It's because you don't have a fucking clue about what you're doing :P
>>>> Hehe, I was waiting for an occasion to use the F* word on the list.
>>>> Thanks!
>>>>
>>>>> if i use JPEG encode for my images.. all the 3 solution i have .. its
>>>>> ok.. have effects..
>>>>
>>>> Well, that's because iText stores JPEGs literally as a JPEG without
>>>> changing any of the bytes. If you look inside, you'll see that the
>>>> filter is DCTDecode (Discrete Cosine Transform).
>>>>
>>>>> i can vizualize my images how to i create then .. perfect..
>>>>> but if i change de JPEG ... for any other encode.. thats not have
>>>>> efect
>>>>> ..
>>>>
>>>> No idea what you're saying here, but you also need to study images.
>>>>
>>>>> can any help-me plz ?
>>>>
>>>> This example doesn't involve iText, but explains what you're missing.
>>>>
>>>> Let's create an image byte per byte:
>>>>
>>>> byte b[] = new byte[256 * 3];
>>>> for (int i = 0; i < 256; i++) {
>>>> b[i * 3] = (byte) (255 - i);
>>>> b[i * 3 + 1] = (byte) (255 - i);
>>>> b[i * 3 + 2] = (byte) i;
>>>> }
>>>>
>>>> This is how a PNG, GIF, and some other image types are stored
>>>> in a PDF, but in zipped format (FlateDecode). These bytes don't
>>>> make any sense if you don't know the bpc, color space and dimensions.
>>>>
>>>> If you want to create an image from this bytes, you could do this:
>>>>
>>>> DataBuffer db = new DataBufferByte(b, b.length);
>>>> WritableRaster raster = Raster.createInterleavedRaster(
>>>> db, 16, 16, 48, 3, new int[]{0,1,2}, null);
>>>> ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
>>>> ColorModel cm = new ComponentColorModel(
>>>> cs, false, false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
>>>> BufferedImage bi = new BufferedImage(cm, raster, false, null);
>>>> ImageIO.write(bi, "bmp", new File("hello.bmp"));
>>>>
>>>> In this example, I treat the image as 16 x 16 pixels, using RGB,
>>>> and converting it to a Bitmap. It's up to you to adapt the example
>>>> if your image is a GrayScale or CMYK image, or if you want another
>>>> format.
>>>>
>>>> (And please don't post the same question multiple times!!!)
>>>> --
>>>> This answer is provided by 1T3XT BVBA
>>>> http://www.1t3xt.com/ - http://www.1t3xt.info
>>>>
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>>>>
>>>
>>>
>>>
>>>
>>
>> --
>> View this message in context:
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>>
>>
>> ------------------------------------------------------------------------------
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>> Try the new software tools for yourself. Speed compiling, find bugs
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------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
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