I n this article, we are going to learn ‘How to install Gscan2PDF in Ubuntu 18.04 – Convert Multiple Files To PDF’. Gscan2PDF is an open source application set by Jeffrey Ratcliffe, which is used to convert many files into PDFs. If you have a physical scanner connected to your system, scan your document directly through this application using your scanner and then save all scanned.

Full Specifications What's new in version 3.07Version 3.07 is a bug fixing release.GeneralPublisherPublisher web siteRelease DateFebruary 20, 2012Date AddedFebruary 21, 2012Version3.07CategoryCategorySubcategoryOperating SystemsOperating SystemsWindows NT/2000/XP/Vista/Server 2008/7Additional RequirementsTWAIN-compliant scannerDownload InformationFile Size2.04MBFile Namesp.exePopularityTotal Downloads6,360Downloads Last Week1PricingLicense ModelFree to tryLimitations30-day trialPrice$29.95.

When I convert a pdf file to bunch of jpg files using convert -quality 100 file.pdf page%04d.jpgI have appreciable quality loss.However if I do the following, there is no (noticeable) quality loss:Start gscan2pdf, choose file- import (and choose file.pdf). Then go to the temporary directory of gscan2pdf. There are many pnm files (one for every page of the pdf-file). Now I do for file in.pnm; doconvert $file $file.jpg doneThe resulting jpg-files are (roughly) of the same quality as the original pdf (which is what I want).Now my question is, if there is a simple command line way to convert the pdf file to a bunch of jpg files without noticeable quality loss? (The solution above is too complicated and time consuming). It's not clear what you mean by 'quality loss'. That could mean a lot of different things.

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Could you post some samples to illustrate? Perhaps cut the same section out of the poor quality and good quality versions (as a PNG to avoid further quality loss).Perhaps you need to use -density to do the conversion at a higher dpi: convert -density 300 file.pdf page%04d.jpg(You can prepend -units PixelsPerInch or -units PixelsPerCentimeter if necessary.

My copy defaults to ppi.)Update: As you pointed out, gscan2pdf (the way you're using it) is just a wrapper for pdfimages (from ). Pdfimages does not do the same thing that convert does when given a PDF as input.convert takes the PDF, renders it at some resolution, and uses the resulting bitmap as the source image.pdfimages looks through the PDF for embedded bitmap images and exports each one to a file. It simply ignores any text or vector drawing commands in the PDF.As a result, if what you have is a PDF that's just a wrapper around a series of bitmaps, pdfimages will do a much better job of extracting them, because it gets you the raw data at its original size. You probably also want to use the -j option to pdfimages, because a PDF can contain raw JPEG data.

By default, pdfimages converts everything to PNM format, and converting JPEG PPM JPEG is a lossy process.So, try pdfimages -j file.pdf pageYou may or may not need to follow that with a convert to.jpg step (depending on what bitmap format the PDF was using).I tried this command on a PDF that I had made myself from a sequence of JPEG images. The extracted JPEGs were byte-for-byte identical to the source images. You can't get higher quality than that. What is not clear in your question is whether you talk about text and vector graphics in your pdf, or whether your pdf contains embedded images.Having read what gscan2pdf is about, my guess is that your pdf files contain (only) embedded graphics.convert essentially 'prints' your pdf without regards for what the contents is. Like @cjm suggests, you might want to change the print density. This is the only way to increase quality for vector graphics.If instead, what you want to do is extract embedded images (much like gscan2pdf seems to do), guessing the density will usually lead to either quality loss or higher quality than required (and waste of disk space). The answer then is to extract the image rather than print the pdf.

Which basically advocates the use of pdfimages in order to extract images without quality loss. This ( pdftoppm) works perfectly, however.

Each of the below commands will ensure an 'images' directory exists, creating it if it doesn't, and store the generated images into that directory.1200 DPI mkdir -p images && pdftoppm -jpeg -r 1200 mypdf.pdf images/pg600 DPI mkdir -p images && pdftoppm -jpeg -r 600 mypdf.pdf images/pg300 DPI (produces 1MB-sized files per pg) mkdir -p images && pdftoppm -jpeg -r 300 mypdf.pdf images/pg300 DPI with least compression/highest quality (produces 2MB-sized files per pg) mkdir -p images && pdftoppm -jpeg -jpegopt quality=100 -r 300 mypdf.pdf images/pgAdditional reading:.