what is the difference between a pdf and jpeg file?
February 25, 2010 4:24am CST
AS i know PDF stands for portable document format and the document standard developed by adope It allows scalable text, vector images, and bitmaps to be combined in one documents.PDFs can also have multiple pages and embedded fonts. JPEGS are bitmap images.This means they will look blocky if u scale them larget than their actual size.They are also compressed,meaning they are not quite as clear as BMP,TIFF,PICT or other bitmap files,but they take up significantly less space.
13 Mar 10
PDF (Portable document format) is a document standard developed by Adobe. It allows scalable text, vector images, and bitmaps to be combined in one document. PDFs can also have multiple pages and embedded fonts. If you open a PDF in Acrobat Reader, for example, you can scale the document to be much larger than the actual size. Because PDFs save the actual text with the document (it is not rasterized), the text will look clean and sharp no matter how much you scale the page. The same is true for vector images in the document, as they are made up of paths, not pixels. Bitmap images, however, will become more and more blocky the larger you scale the document. JPEGs are bitmap images. This means they will look blocky if you scale them larger than their actual size. They are also compressed, meaning they are not quite as clear as BMP, TIFF, PICT, or other bitmap files, but they take up significantly less space. JPEGs cannot include paths, text, or embedded fonts like PDFs can. For this reason, PDFs are the best choice for saving documents that include text or vector images (paths). Bitmap images, such as those taken with a digital camera, are typically saved in the JPEG format. Most pictures you see on the Web are JPEGs. PDFs and JPEGs are both cross-platform, meaning they will look the same on a Mac as they do on a Windows PC. While the formats have significant differences, most picture viewing programs can open JPEGs and PDFs. Mac OS X has built-in support for PDFs, allowing documents to be saved as PDFs from the Print dialog box. To create a PDF from scratch, however, you'll need to use Adobe Acrobat. Just about any image editing program will allow you to save your document as a JPEG.use Adobe Acrobat. Just about any image editing program will allow you to save your document as a JPEG.
• Cambridge, England
25 Feb 10
You have more or less answered your own question. Portable Document Format is a proprietary file format owned and created by Adobe. It was originally intended to be a format which would produce substantially the same result on many different printers in the days when each printer had its own peculiarities and different drivers could give very different results from the same word processing software. PDF files are actually text files which describe the document and its layout in detail. They may contain vector images of fonts which may not be available on all computers, vector images of diagrams and graphics and also bitmap images of graphics and even entire pages. They can also include security protection which specifies what a user may do with them. A JPEG file is a compressed bitmap image format which is also a proprietary format. Besides the image, which is compressed using a 'lossy' algorithm, it can also contain a great deal of information about the image, its origin and its owner. 'Lossy' compression means that the original pixels of the uncompressed bitmap are processed in such a way that they cannot be uncompressed to a bitmap which is identical with the original. Normally this is not a problem because there is a great deal of redundant information in most continuous tone images. If one is expecting to do much editing on a photograph, however, with multiple saves in between, the image will be degraded slightly every time it is saved as a JPG file. In summary, PDF files are document files intended for printing or on-screen viewing which may contain images but may also contain many other kinds of information. JPG files are compressed bitmap image files which contain the image itself along with data relevant to the image.