A PDF e-book with a small number of pages has hundreds of megabytes. After using the weight-loss software to lose weight, the effect is not obvious. Is there any good way to lose weight in PDF e-books? This article will tell you in detail about PDF weight loss tips. I often look at various e-books because of the needs of teaching and research. In order to experience the original works and not go astray, I like to read the scanned PDF e-book. According to past experience, a hundreds of pages of PDF scan e-books take up a few megabytes of space is clear enough, but I downloaded a PDF e-book with only one hundred pages actually occupied 114MB hard disk space. . I realized that there is moisture in the production of this book, and I am sure that it can be greatly reduced in size by losing weight. However, after using the online recommended PDF processing software PDF-ToolsPortable weight loss module optimization, I found that the file size after weight loss is 112MB, only 2MB, the effect is minimal. Is it a software problem, or is there another mystery in the book? So, I plunged into the reading forum and listened to the masters about the various methods and high opinions about the weight loss of PDF e-books. Based on the opinions of everyone, PDF weight loss cannot be generalized. It is necessary to take appropriate weight loss measures according to the type of book. Through the joint use of the four software, you can basically get the weight loss task of common PDF e-books. Scanning PDF weight loss "three steps" for the scanned version of the PDF e-book, because its composition is a picture of the frame, so the weight loss work is mainly to optimize the page image. However, since these images have been compiled into PDF files, general image processing software or optimized image tools can't do anything about them. Therefore, we must think of decompiling PDF files to get a single image series file, then optimize and reorganize. jobs. Book disassembly I used the PDF professional editing tool Adobe Acrobat Professional V8.1 to decompile PDF. Note that Adobe Acrobat is not the Acrobat Reader we use every day. It is a professional version of the tool with editing capabilities. Start Adobe Acrobat Professional V8.1 and open the PDF eBook you want to work with. Click the "Export" button on the “Tasks> toolbar, then select the file format (or select “more formats”, or select “file →export”or select “file&rarr ;Save as & rdquo;), and then select the file format as JPG. Click “Settings" to set conversion options such as grayscale and color JPEG quality levels according to your needs. After the options are set, click “OK" Apply settings (Figure 1). You can also edit the conversion settings in the "Transfer from PDF" preferences. These conversion settings are stored separately from the settings used by the “Export All Images” command. Click the “Save” button to export the PDF to the selected file format JPG. By default, the source file name with the file type appended is used as the file name, and the exported file is saved to the same folder. Since the PDF is saved in image format, each page is saved as a single image file store, so we get a single image file sequence. Image Optimization Speaking of image optimization, the software that can do the job can be said to be a lot of things, but I have to use the fastest and most convenient way to get the picture that suits me, so I have to choose convenient and practical tools. In this step, I chose ComicEnhancer Pro as a batch image processing tool, which can adjust the curve, brightness, contrast, high brightness, etc. of all image files in the specified directory in batches. Even the poorly scanned electronic comics or pictures can be perfect. The direction of the conversion, get better results and a more reasonable size, making it more suitable for collection. First use ComicEnhancer Pro to open the image file to be optimized once or in several times, and set various parameters on the operation panel, mainly JPG quality, trimming, brightness, zoom, etc. (Figure 2), the setting is very simple, use the slider Drag it. After the parameters are set, click the “Save as” button to save the optimized image. Or use “file → batch conversion & rdquo; direct bulk conversion is also very convenient (Figure 3). After the book reorganization image optimization, the final work is to regenerate the PDF file with the optimized image. This work also requires efficiency, I chose the more convenient green gadget FreePic2Pdf. Start FreePic2Pdf and follow the number prompts on the interface to complete the file conversion in 4 steps (Figure 4). First, click on the golden file open button to import the image series file we got above. If there is a problem with the order of the imported files, you can use the four arrow buttons above the toolbar to adjust the order. Under the “Conversion Results” column, select “Save all PDF files” and “Use fixed files/folders” and name the output files. Finally, click the “Start Conversion” button to convert. After the conversion, we found that the resulting PDF file is 12MB, the size is reduced to one tenth of the original, and the weight loss effect is very impressive. Tip: We can further set the size of the page and the resolution of the image through the “ parameter setting & rdquo; button. This means that it gives us a second chance to compress and further reduce the size of the PDF file by reducing the resolution of the image file (Figure 5). A soft to get the graphic version of PDF weight loss If the PDF e-book we are on is not a photo scan version, then you should consider the following program. This is a solution to the graphic version of PDF weight loss. Some software for PDF weight loss on the Internet are generally designed for graphic and textual PDF. Below, we achieved weight loss on a book through the dedicated weight loss software PDF Shrink. After starting PDF Shrink, choose according to the actual needs in the four schemes given by the software. After being compressed by Email, it is convenient to be sent as an email. The compression ratio is 1:10. After printing with Print, it can be used for printing. The original file still maintains good definition, and the compression ratio is 1:2. The Smartphone method indicates that it can be used for mobile phones. Or read on mobile devices; Web mode is mainly used for viewing in web pages, and the compression ratio is the largest, about 1:13. Which one to choose depends on the occasion (Figure 6). For example, the book I want to optimize needs to be printed out, so here I choose to use “Print (print mode)” to compress and lose weight. Next, click the Process PDF button or drag and drop the PDF file that needs to be slimmed down directly to the corresponding item on the main interface, and the slimming work starts automatically. The Status in the window shows the current working status. The blank space below the Name shows the progress of the compression, and the Settings indicates the selected compression mode (Print Print). After the end, the lower bar will show the weight loss ratio Shunk (Figure 7). If you are not satisfied with the default settings of the above four schemes provided by the software itself, you need to use a custom scheme. Click the green + button in the toolbar of the main interface, the software will pop up a setup wizard. According to the wizard, we can build a set of our own solutions step by step. Click Advanced in the interface diagram to make more settings, including resolution, compression ratio, and so on. Unchanged means that the original resolution is not changed; if you need to see the picture more clearly, you can set it to 150DPI or 200DPI; Comperssion quality is used to select the compression ratio, and select a suitable compression level through the drop-down list or the slider below. Just fine. Since different categories of PDF documents contain different kinds of useless information, we can remove them by using the options provided in the tool. For example, you can remove the original PDF document private information, METADATA, etc. However, it should be noted that since there is no experience, we can't guarantee a satisfactory result with one optimization. Therefore, it is best to back up the original file before losing weight. Tip: In order to check the effect before and after compression, you can compare the screenshots of some pages before and after compression. Use this standard to measure and adjust parameters and set them to a suitable range. This article comes from [System Home] www.xp85.com