jbig2 | 易学教程

Extract images from PDF, how to handle JBIG2 encoded

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问题 I have a bunch of PDF files, some of them are pure text but some are fully or partially saved as "One image per page" because they are generated from a scanner. I need to extract all images contained in the PDF and then examine each image separately. I was able to extract most of the images with a python script found here in SO see question: Extract images from PDF without resampling, in python? Some of the included images were encoded using JBIG2 and I could not find any python or other tool

jbig2 data in pdf is not valid jbig2 data. Wrong magic

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问题 I would like to take some jbig2 data out of a pdf file and load it using libjbig2dec (http://sourceforge.net/projects/jbig2dec) For some reason the jbig2 data in the pdf file starts with this: 00000000 00 00 00 00 30 01 01 00 00 00 13 00 00 0a 5e 00 00000010 00 0f c3 00 00 2e 23 00 00 2e 23 00 00 00 00 00 00000020 00 01 26 01 01 ff ff ff ff 00 00 0a 5e 00 00 0f 00000030 c3 00 00 00 00 00 00 00 00 00 00 03 ff fd ff 02 00000040 fe fe fe ab f3 d0 fe 9e 92 d8 9f 63 ae 67 79 b8 00000050 81 ff 57

PDF Box generating blank images due to JBIG2 Images in it

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问题 Let me give you an overview of my project first. I have a pdf which I need to convert into images(One image for one page) using PDFBox API and write all those images onto a new pdf using PDFBox API itself. Basically, converting a pdf into a pdf, which we refer to as PDF Transcoding. For certain pdfs, which contain JBIG2 images, PDFbox implementation of convertToImage() method is failing silently without any exceptions or errors and finally, producing a PDF, but this time, just with blank

Print PDF that contains JBIG2 images

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问题 Please, suggest me some libraries that will help me print PDF files that contain JBIG2 encoded images. PDFRenderer , PDFBox don't help me. These libs can print simple PDF, but not PDF containing JBIG2 images. PDFRenderer tries to fix it (according to bug issue on PDFRedndrer's bug tracker), but some pages still (especially where barcodes exist) don't want to print. P.S. I use javax.print API within applet Thanks! UPDATE : also tried ICEPdf, is too don't want to work. I came to the conclusion

Print PDF that contains JBIG2 images

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Please, suggest me some libraries that will help me print PDF files that contain JBIG2 encoded images. PDFRenderer , PDFBox don't help me. These libs can print simple PDF, but not PDF containing JBIG2 images. PDFRenderer tries to fix it (according to bug issue on PDFRedndrer's bug tracker), but some pages still (especially where barcodes exist) don't want to print. P.S. I use javax.print API within applet Thanks! UPDATE : also tried ICEPdf, is too don't want to work. I came to the conclusion that all these libraries(PDFRenderer, ICEPdf, PDFBox) use JPedals jbig2 decoder . Bug (some pages didn

How to write a new image format decoder in Chrome Browser

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Browsers have poor support of image formats. Actually only GIF, JPG, PNG and WebP are supported. I would like to had a new one : JBIG2 From the end user point of view, he will only download and install a chrome extension and his browser will be able to decode the new image format. From the web developer point of view, new format will be transparent and compatible with tag img, canvas and css. To display JBIG2 images, he still uses : <img src=“path/to/myImage.jbig2”> or var myImage = new Image(); myImage.addEventListener( 'load', function() { // insert in canvas, when image is loaded });