----------------------------------------
> 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.
>
> 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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>>>
>>
>>
>>
>>
>
> --
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> Sent from the iText - General mailing list archive at Nabble.com.
>
>
> ------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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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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