how to reduce a file size on an large dimension image

HOW TO REDUCE A FILE SIZE ON AN LARGE DIMENSION IMAGE PDF

If this PDF document is split into 5 files, one page per file, then each output file is about 420KB in size. The most space in this file is taken by fonts (72%) and images (18%), while text occupies just 5% of the file size: There are 404KB of fonts inside this PDF file, while document text accounts just for 28KB. The sample PDF file has 5 pages and is 556KB in size. There is a direct correspondence between file size and number of pages, because most of the input file size is composed of document text: The content stream for each output document is about 10K (input PDF document has 684KB in content streams, about 10KB per page).Įach output file also has 24KB of fonts, the rest is what it is called 'document overhead'.

If this PDF document is split into 74 files with one page per file, then output file size for each document is about 44KB. Here is a screenshot of 'Audit Space Usage' dialog for this document: There are just 25KB of fonts in this document. Most of the file (91%) is taken by Content Streams (page text). Sample PDF file has 74 pages (749KB total file size). Example 1: PDF file without fonts and images. If input PDF file has a set of fonts, then each output file needs to have them as well. The output files cannot be smaller than total number of font resources in the original PDF document. However, if a PDF file has fonts and images, then output files should also contain these fonts and images (in some cases) regardless of number of pages. Why Splitting Does Not Always Reduce File Size? If a PDF file is mostly composed of content streams (text) and has no embedded fonts or images, then splitting such file into multiple documents produces files with sizes that are proportional to number of pages. The example below shows that 53% of the file size are taken by fonts, while only 23% are occupied by actual document text. Press 'Audit Space Usage.' button to display distribution of the file size among various file components. Open a PDF document and select 'File > Save As Other > Optimized PDF.' from Acrobat menu. Auditing PDF File Size The Adobe Acrobat provides excellent function for inspecting PDF file structure. The higher is image resolution, the more space images will take. The image resolution (image dimension in pixels) is also crucial. Color images take up more space than monochrome or grayscale images. The resolution and bit-depth of images greatly affects overall file size. The second reason is using images for creating PDF file. It is recommended to avoid using Adobe Acrobat to directly editing text in PDF documents. Adding a single font to a PDF document may increase file size by 400-600KB. Fonts can be subsetted and embedded right into PDF file. The first reason is that one or more fonts are stored inside PDF document. Causes of File Size Increase Typically, there are two major reasons why PDF file size can be 'disproportionally' large.

This means that number of pages cannot be used to measure how large or small a specific PDF file should be. Depending on internal file structure, content streams might occupy just a small percentage of the overall file size or almost an entire document. PDF File Size and Number of Pages The only part of the PDF file that is proportional in size to number of pages is 'content streams'. Document overhead and various low level elements such as extended graphics states, structure info and etc.Content streams (the actual text content of the document).What PDF file is composed of? PDF file is composed from multiple components: It is crucial to understand the actual file size allocation between various PDF components before attempting to reduce the size of the specific PDF document or making any conclusions that file is 'too big' for the number of pages. Similar questions arise when splitting a PDF document into multiple files and discovering that resulting file sizes are not proportional to number of pages. Understanding PDF File Size PDF File Size Issue Quite often users are wondering why a specific PDF file is so big while it is just few pages long.

How to reduce a file size on an large dimension image