Acrobat Help | Optimizing PDFs. PDF Optimizer provides. We review Adobe's PDF Optimizer in Acrobat 8 Professional (pre-release) and Apago's PDF Enhancer 3.1. Figure 2). By default, save as removes changes that are appended to PDFs by the Save command, linearizes the file for fast web viewing, and removes unused objects. Figure 2: Save As to save. Note that optimizing a signed document will invalidate its signature. More » Optimize PDF Files > PDF Optimizer > PDF Optimizer 2 > Combine Files > Optimization Tools. By website optimization on. Optimizing PDFs with Adobe Acrobat. Optimizing PDFs with Adobe Acrobat. Acrobat Tutorials. SHARE. such as sending via email or viewing on the Web. You can use Acrobat 9 to adjust the content and characteristics of a print-oriented PDF to repurpose it for just such a use. Step 1. But the most important option here is to Optimize the PDF for Fast Web View. This allows your website-placed PDF to be served up one page at a time rather than demanding the whole document. PDF files. Some of the PDF. Optimizer settings are comparable to the settings that. PDF file using Distiller. Whether. you use all of these settings or only a few depends on how you intend. In most cases, the default settings are appropriate for maximum. Before you. optimize a file, it’s a good idea to audit the file’s space usage. The space audit results may give you ideas about where best to reduce. You can also reduce the size of your PDF by using the. Reduce File Size command. Note: Some methods of compression may make images. You should experiment with. To open the PDF Optimizer dialog. In a single PDF, choose File >. Save As Other > Optimized PDF. When editing an Action Wizard. Save To options. Then in the Output Options dialog. PDF Optimizer, and click Settings. Note: PDF Optimizer isn’t available. Reflow is selected in the View menu. Auditing the space usage gives you a report. The results are reported both. Choose File > Save. As Other > Optimized PDF. The PDF Optimizer dialog box opens. Click the Audit Space Usage button. You can also audit space usage of. PDF in the Content pane. Choose View > Show/Hide > Navigation. Panes > Content. From the Content pane options menu , choose.
Audit Space Usage. Video tutorial: How to Optimize your PDF File. Open the PDF Optimizer dialog. File > Save As Other > Optimized. PDF). To use the default settings, choose Standard from the. Settings menu, and then skip to step 6. If you change any settings. PDF Optimizer dialog box, the Settings. Custom. From the Make Compatible With menu, choose Retain Existing. PDF version, or choose an Acrobat version. The. options available in panels vary depending on this choice.)Select the check box next to a panel (for example, Images. Fonts, Transparency), and then select options in that panel. To. prevent all of the options in a panel from executing during optimization. Optional) To save your customized settings, click the. Save button and name the settings. To delete a saved setting, choose. Settings menu and click Delete.)When you are finished selecting options, click OK. In the Save Optimized As dialog box, click Save to overwrite. PDF with the optimized PDF, or select a new name or. To optimize several documents at the same. Output options for the Actions Wizard. Use. the options from the panels in the PDF Optimizer dialog. PDF. The Images panel of the PDF Optimizer lets. Change the PDF compatibility in the Images panel of the PDF. Optimizer dialog box in < span class="uicontrol"> Acrobat Pro< /span>. Specify. the following options, as needed: Downsample. Reduces file size by lowering the resolution of images, which involves. Masked. images and images with a size less than 1. Compression. Reduces file size by eliminating unnecessary pixel data. In general, JPEG and JPEG 2. ZIP is the better choice for illustrations with large areas of solid. For monochrome images. JBIG2 compression, which is available in PDF Optimizer but. Distiller, is superior to CCITT. Quality. Available only for JPEG and JPEG 2. JPEG and JPEG. 2. You can apply lossy JPEG. JPEG 2. 00. 0 compression to color images at various levels (minimum. For JPEG 2. 00. 0 compression, you can. Compression. for monochrome images is lossless, except for JBIG2 compression, which. Tile Size. Available only for JPEG 2. Divides the image being compressed. If the image height or width is not. Image data for each tile is individually compressed and. The default value of 2. Optimize Images Only If There Is A Reduction In Size. When selected, if the image setting will cause an increase. To ensure an exact match to the source document. If you. don’t need an exact match and you prefer a smaller file, you can. East Asian text (Traditional. Chinese, Simplified Chinese, Korean, and. Japanese). Text in these languages is replaced with a substitution. The. Fonts panel of the PDF Optimizer contains two. Certain fonts aren’t available for unembedding and don’t. Fonts panel. To unembed fonts in a document, select. Embedded Fonts list. Unembed button. If you don’t want to embed subsets. Subset All Embedded Fonts. To prevent unembedding for all fonts in the document, select Do. Not Unembed Any Font. If your PDF includes artwork that contains. Transparency panel of PDF. Optimizer to flatten transparency and reduce file size. Flattening. incorporates transparency into corresponding artwork by sectioning. PDF. Optimizer applies transparency options to all pages. If. you select the Acrobat 4. And Later compatibility. Transparency panel is enabled and all transparency. This ensures compatibility. Acrobat 4. 0 and earlier, which doesn’t support transparency. When. you create flattening presets, they appear with the default presets. Transparency panel. Note: Transparency flattening cannot. The Discard. Objects panel lets you specify objects to remove from. PDF and lets you optimize curved lines in CAD drawings. You. can discard objects created in Acrobat and in other applications. Selecting an object removes all occurrences of that object within. PDF. In the Discard Objects area. Discard All Form Submission, Import And Reset Actions. Disables all actions related to submitting or importing form. This option retains form objects to. Flatten Form Fields. Makes form fields unusable with no change to their appearance. Form data is merged with the page to become page content. Discard All Java. Script Actions. Removes any actions in the PDF that use Java. Script. Discard All Alternate Images. Removes all versions of an image. Some PDFs include. Discard Embedded Page Thumbnails. Removes. embedded page thumbnails. This is useful for large documents, which. Page. Thumbnails button. Discard Document Tags. Removes. tags from the document, which also removes the accessibility and. Convert Smooth Lines To Curves. Reduces the number of control points. CAD drawings, which results in smaller PDF. Detect And Merge Image Fragments. Looks for images or masks that are fragmented. Discard Embedded Print Settings. Removes embedded print settings, such as page scaling and. Discard Embedded Search Index. Removes embedded search indexes, which reduces file size. Discard Bookmarks. Removes all bookmarks from the document. Use the Discard User Data panel. If you’re unable to find personal information. You can locate hidden text and user- related information. Examine Document command (Tools. Protection > Remove Hidden Information). Discard All Comments,Forms. And Multimedia. Removes all comments, forms, form fields, and multimedia. PDF. Discard Document Information And Metadata. Removes information in the document information dictionary. Use the Save As command. PDF.)Discard All Object Data. Removes all objects from the PDF. Discard File Attachments. Removes all file attachments, including attachments added. PDF as comments. (PDF Optimizer doesn’t. Discard External Cross References. Removes links to other documents. Links that jump to other. PDF are not removed. Discard Private Data Of Other Applications. Strips information from. PDF document that is useful only to the application that created. This does not affect the functionality of the PDF. Discard Hidden Layer Content And Flatten. Visible Layers. Decreases file size. The optimized document looks like the. PDF but doesn’t contain layer information. The options in the Clean Up panel. PDF Optimizer remove useless items from the document. These. items include elements that are obsolete or unnecessary for your. Removing certain elements can seriously. PDF. By default, only elements that. If you are unsure of the. Object Compression Options. Specifies how to apply Flate compression in the file. Use Flate To Encode Streams That Are Not Encoded. Applies Flate compression to all streams that aren’t encoded. In Streams That Use LZW Encoding, Use Flate Instead. Applies Flate compression to all content streams and images. LZW encoding. Discard Invalid Bookmarks. Removes bookmarks that point to pages in the document that. Discard Invalid Links. Removes links that jump to invalid destinations. Discard Unreferenced Named Destinations. Removes named destinations that are not being referenced. PDF document. Because this option does. PDF files or websites, it does not fit. Optimize Page Content. Converts all end- of- line characters to space characters, which. Flate compression. Optimize The PDF For Fast Web View. Restructures a PDF document for page- at- a- time downloading. Fast Web View restructures a PDF document for page- at- a- time downloading (byte- serving) from web servers. With Fast Web View, the web server sends only the requested page, rather than the entire PDF. This option is especially important with large documents that can take a long time to download from a server. Check with your webmaster to make sure that the web server software you use supports page- at- a- time downloading. To ensure that the PDF documents on your website appear in older browsers, you can also create HTML links (versus ASP scripts or the POST method) to the PDF documents and use relatively short path names (2. Do one of the following: Open the PDF in Acrobat, and choose File > Properties. Look in the lower right area of the Description panel of the dialog box for the Fast Web View setting (Yes or No).(Windows only) Right- click the PDF file icon and choose Properties. Click the PDF tab and look near the bottom of the panel for the Fast Web View setting (Yes or No). Follow this procedure to make sure that you have Acrobat set up to enable Fast Web View during the PDF creation process. In the Preferences dialog box under Categories, select Documents. On the right side of the dialog box, under Save Settings, make sure that Save As Optimizes For Fast Web View is selected, and click OK. Use this procedure after you have verified your Fast Web View Preferences setting and checked the PDF properties to be sure that the file is not already enabled for Fast Web View. Choose File > Save As. Select the same filename and location. Optimize PDF Files - tips on pdf optimization to compress file size & optimizing pdf files. In this article we'll give you tips and tools to optimize PDFs for minimum file size while still maintaining accessibility and search engine visibility. We review Adobe's PDF Optimizer in Acrobat 8 Professional (pre- release) and Apago's PDF Enhancer 3. What Is a PDF? Portable Document Format (PDF) is the defacto file format for presenting device- independent documents on and off the Web. PDFs are an efficient way to accurately describe simple to intricate documents for screen or print output. A PDF document is a collection of objects with structural information in a self- contained series of bytes. PDF is a page description language, like Post. Script but simplified with restricted functionality (no programming like Post. Script) to be more lightweight. PDFs use the following compression algorithms to reduce file size: LZW (Lempel- Ziv- Welch, see Minimize Bit Depth) and FLATE (ZIP, in PDF 1. JPEG and JPEG2. 00. PDF version 1. 5) for lossy (or lossless for JPEG2. CCITT (the facsimile standard, Group 3 or 4), run- length, and JBIG2 compression (PDF version 1. It is in how well you use these compression techniques, how efficiently the data is described (including image resolution) and the complexity of the document (read number of fonts, forms, images, and multimedia) that ultimately determines how large your resulting PDF file will be. Creating Small PDFs. The main factors in creating small PDFs are image resolution, image type (bitmap or vector), the number of fonts used and how they are embedded, PDF version, and the level of compression. In general the higher the PDF version number, the smaller the file. Acrobat 5 (PDF version 1. JBIG2 compression, which is superior to the CCITT or Zip algorithms when compressing scanned monochromatic copy (see Table 1). JBIG2 (Joint Bilevel Image Experts Group) encodes compressed monochrome (1 bit per pixel) image data from 2. Like other dictionary- based algorithms (LZW, ZIP) JBIG2 creates a table of unique symbols and when a subsequent symbol matches one in the table, it substitutes a token pointing to the table index. JBIG2 also compresses the entire table. Acrobat 6 (PDF version 1. Clean Up Settings dialog). However, since over 9. Acrobat users have version 5. PDF 1. 4 is a safer alternative. Acrobat will usually display (with a warning) a more recent PDF version, but new compression schemes will spawn an error when opened in older versions of Acrobat. Table 1: Acrobat Version Information. Acrobat Version. Year Introduced. PDF Version. Major Features Added. Added interactions, movies/sounds, forms, CJK (Chinese, Japanese, Korean), web (hyperlinks, URLs, etc.), linearization for fast page display. Added structure, digital signatures, file embedding, Java. Script, RTL (Right to Left), color separations, Postscript Level 3 additions, uses opaque imaging model. Added JBIG2 compression, transparent imaging model, tagged PDF files (for standardized extraction of objects)6. Added Compress entire file, XFA Forms (XML)7. Added improved PDF Optimizer Interface, Path smoothing, Chopped image repair, Image enhancement (despeckle, etc.), can embed Open. Type fonts. 8. 0. Improved PDF Optimizer Interface again, broke out "Discard User Data" into one pane, flatten form fields, combine and optimize files. Some improvement in areas of 3. D, advanced commenting features, and security. Note defaults to saving in Acrobat 1. To create the smallest possible PDFs for the Web minimize the number of fonts, bitmapped images, and substitute vector based- graphics instead. Minimize the number and complexity of forms in your PDF document and flatten form fields, and avoid the use of multimedia. There are different methods to create PDFs, including outputting to Post. Script and Distilling, GDI/Printing (Webopedia Definition of Graphic Device Interface), one- click "Direct to PDF," and dynamically on the server- side. However you create a PDF, the techniques and tools listed below can help you enhance and optimize your PDFs for the Web. Avoid Refried Graphics. For graphics that must be inserted as bitmaps, prepare them for maximum compressibility and minimum dimensions. Use the best quality images that you can at the output resolution of the PDF. Inserting compressed JPEGs into PDFs and Distilling them may recompress JPEGs, which can create noticeable artifacts. Use black and white images and text instead of color images to allow the use of the newer JBIG2 standard that excels in monochromatic compression. Be sure to turn off thumbnails when saving PDFs for the Web. Use Vector Graphics. Use vector- based graphics wherever possible for images that would normally be made into GIFs. Vector images scale perfectly, look marvelous, and their mathematical formulas usually take up less space than bitmapped graphics that describe every pixel (although there are some cases where bitmap graphics are actually smaller than vector graphics). You can also compress vector image data using ZIP compression, which is built into the PDF format. Acrobat Reader version 5 and 6 also support the SVG standard. Minimize Fonts. How you use fonts, especially in smaller PDFs, can have a significant impact on file size. Minimize the number of fonts you use in your documents to minimize their impact on file size. Each additional fully embedded font can easily take 4. K in file size, which is why most authors create "subsetted" fonts that only include the glyphs actually used. Flatten Fat Forms. Acrobat forms can take up a lot of space in your PDFs. New in Acrobat 8 Pro you can flatten form fields in the Advanced - > PDF Optimizer - > Discard Objects dialog. Flattening forms makes form fields unusable and form data is merged with the page. You can also use PDF Enhancer from Apago to reduce forms by 5. You can also combine a refried PDF with the old form pages to create a hybrid PDF in Acrobat (see "Refried PDF" section below). Figure 1: Flatten form fields to save space. Dueling Color Spaces. RGB (Red Green Blue) is an additive coloring system where the addition of each color moves the mixed color towards white. CMYK (Cyan Magenta Yellow Black) is a subtractive system where adding color to each part moves the mixed result towards black. RGB is used in computer screens and televisions. Every system that emits light uses RGB. CMYK is used in reflective systems where the color is set by the reflection of light on a surface. Printing systems are the prime example. It is important to use the right system for your color- based project. The most important factor is the gamut of each system. Gamut is the range of color each system can generate. RGB is very good at providing bright reds, blues, and greens. CMYK can't do this. Thus converting from RGB to CMYK can give unpredictable results. Not many applications do this well, although Adobe Photo. Shop and PDF Enhancer color maps perfectly (1,2).(1) http: //www. RGB versus CMYK gamuts, from Adobe. RGB almost covers the CYMK gamut, according to this technical document from Adobe. Converting from CMYK to RGB is pretty safe, but color changes do occur.(2)Email from Leonard Rosenthol of Apago. Feb. 1. 0, 2. 00. Use the RGB versus CMYK Color Space. For web- only PDFs if you have a choice, use the RGB color space for your PDFs versus the CMYK color space. RBG has one less data channel than CMYK, so files are that much smaller in size. Also, Microsoft applications all think in RGB, even when importing CMYK images. Convert to Grayscale. If color is not required, you can convert your PDF to grayscale. In Acrobat 8 select Advanced - > Print Production - > Convert Colors menu. Under Document Colors select "Device Gray," and under Destination Space choose "Gray Gamma 1. A test on a color print ad saved 5. Optimizing Existing PDFs. In many cases you won't have access to the original document, just the resulting PDF file. Many PDFs we've seen are not fully optimized for the Web, using conservative settings more appropriate to high- resolution printers. For computer monitors viewing web- based PDFs, you don't need high resolution images and exact reproduction of font faces, you just want to convey your information in an efficient way. Using the techniques outlined below, you can shrink your PDFs, while still maintaining the textual data for search engines, and reasonable quality for print output. Some webmasters offer two versions of their PDFs, once for fast web display, and one for printing. Save As.. Once you're done making changes to your PDF document choose File - > Save As and overwrite your existing PDF file (see Figure 2). By default, save as removes changes that are appended to PDFs by the Save command, linearizes the file for fast web viewing, and removes unused objects. Figure 2: Save As to save space. The result is a compact, linearized PDF that displays the first page (or an arbitrary page) quickly, while the rest of the file downloads in the background. Although linearized PDFs are slightly larger, they also increase perceived speed. Note that optimizing a signed document will invalidate its signature. More »Optimize PDF Files > PDF Optimizer > PDF Optimizer 2 > Combine Files > Optimization Tools.
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