7 Replies Latest reply: Mar 5, 2012 4:22 PM by c-fqgy RSS

    anti-aliased text when exporting PDF to image

    studentpress

      I need to be able to batch-convert multi-page PDFs to individual bitmap images (one image for each page) with anti-aliased text.

      Photoshop works this way if you open a single PDF, allowing you to select one or more pages to rasterize as separate images, but not when batch processing (specifically, if you use the Image Processor script on a folder of images and PDFs, it will rasterize the PDFs automatically, but it will only do so with the first page of each PDF.)

      Acrobat, on the other hand, automatically creates an image for each page when exporting, and can do this in a batch sequence, but the text is not anti-aliased, making the image look like a screenshot from 1997. No matter how high an image resolution you select, the text is still jagged when you zoom in.

      So, is there a setting I'm missing that will allow the text to be anti-aliased when using Acrobat to export PDF to an image? I am using Acrobat 8, not 9, so something might have changed in the newest version.

        • 1. Re: anti-aliased text when exporting PDF to image
          markerline Community Member

          Not sure about Acrobat Pro 8, but in Acrobat Pro 9 (not Extended) you can Export>Image>Multiple Choice: JPEG, JPEG2000, PNG, TIFF.  I used JPEG and under the options in the export dialog box, leave the filename as is to coincide with the PDF filename and then choose Maximum Resolution under File Settings: Grayscale (JPEG, Quality:Maximum); Color (JPEG, Quality:Maximum) . . . skip down to Conversion Colorspace: Determine Automatically and Resolution choose 600pixels/inch for a letter size document.  This will result in a file size of 1.3MB per JPEG image if there is not a lot of information on the page.  I chose a simple header, footer with page numbering, and 5 lines of Lorem Ipsum text.  600dpi is overkill, you can go for 300dpi and still result in a decent image that will be able to be printed on a laser photocopier that is connected to a production computer.  Obviously if you are printing to a laser printer or a high quality inkjet 300dpi will suffice as well for a letter sized document.  But I have been told that 300dpi is not a standard rule of thumb and you must obtain specs from your printer since he/she can calculate by very strict rules the dpi you need for your content.  It depends on whether you have background images such as watermarks and also if your text body contains line-art.

          • 2. Re: anti-aliased text when exporting PDF to image
            markerline Community Member

            See this post:

             

            http://forums.adobe.com/message/2411020#2411020

             

            Also, I inspected the JPG and it is ALIASED, no anti-alias interpolation there.  But if you choose a high enough resolution the image will print clearly.

            • 3. Re: anti-aliased text when exporting PDF to image
              markerline Community Member

              Look at page 10 of the following PDF file:

               

              http://www.adobe.com/designcenter/creativesuite/articles/cs3ip_printprodtrans.pdf

               

              It covers transparency settings in Print Production and Preflight

              • 4. Re: anti-aliased text when exporting PDF to image
                markerline Community Member

                My solution to you would be to generate 5.7MB TIFF files at 1200dpi and then batch process them in Photoshop by using Image Size>change dpi from 1200 to 300 and use Bicubic Sharper (best for reduction) resampling as a check-marked option.  You will then have anti-aliased files.  Try this step and let me know if you are happy with the results.

                -markerline

                • 5. Re: anti-aliased text when exporting PDF to image
                  studentpress Community Member

                  That actually works well, making the resolution really high and using Photoshop to downsample, especially since both of those tasks could be batch-processed. The only problem is that  the PDFs I am working with have pages of up to 9 x 12 in size, with full color bitmap and text elements. When I tried it on a 2-page PDF like the one I described, with the 1200 dpi resolution, it took Acrobat several minutes to generate even one set of TIFFs, on my 2007 Mac Pro with 5 GB of RAM. Each TIFF file was more than 20 megabytes in size, and uncompressed they were more than 400MB in size. Since I have hundreds of files to convert at a time, it would probably take a few days for the Mac Pro to complete batch processing in both Acrobat and Photoshop.

                   

                  It seems silly that with all of the output options available in Acrobat for exporting to images (which you detailed in your first answer), anti-aliasing is not one of them. Maybe I will see if I can automate the process of getting Photoshop to rasterize and resize all of the pages in a PDF, and attack the problem from the that end. I'm not that good with scripting, though.

                  • 6. Re: anti-aliased text when exporting PDF to image
                    MichaelKazlow CommunityMVP

                    This isn't a feature request but a problem that would have been best discussed in the regular Acrobat Windows forum. I do hear what you want, but I really need to ask why you need this. It appears you have a workflow that is going in the wrong direction. Why in the world do you want to make bitmaps out of pdfs for printing. At the end of this, I bet we hear something about a printer that is working with equipment from the Digital Stone Age.

                    • 7. Re: anti-aliased text when exporting PDF to image
                      c-fqgy Community Member

                      I'm having the same problem I have several folders with PDF maps in them and I want to export them to JPGs but they are coming out looking like crap. My reason for this option: Its what the client wants! PDFs & JPGs