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| File extension | |
|---|---|
| File category | Document file |
| Stands for | Portable Document File |
| Developer | Adobe Systems |
| Overview | PDF is a format which stores documents that can include text with distinct fonts and images. The text that is present in it is of static or fixed format which is just like an image and it remains exactly the same even if we open this file using other programs, hardware and different operating systems. That is why it is recommended to convert the file into this format before printing or transferring, so, that the arrangement of the lines remains the same. Thereby, the output that is generated is always a printer-ready. These files are editable and can be amended using various editors. Several files can also be merged and compressed online. It does not only support Adobe Acrobat Reader but also other similar programs. These files can be sent, saved and viewed easily using phones, computers or tablets. |
| Technical description | There is a vast horizon of features that are available in PDFs. The content in it can have logical structuring elements, annotations, rich media, digital signatures and 3D computer graphics data (U3D); etc. Although, it is a 7-bit ASCII (American Standard Code for information interchange), yet, it may contain binary content as well. This file starts with a header which indicates how bits are used to encode information, succeeded by the version of the format. Furthermore, it is a subset of COS i.e. Carousel object structure, which expands to eight primary objects named as- Boolean Values (true or false), numbers, strings, names, arrays, dictionaries, streams and the null object. These files can also be password protected for security reasons. |
| Links | wikipedia.org (opens in new tab - official documentation) |
| File extension | .tiff |
|---|---|
| File category | Raster image file |
| Stands for | Tagged Image File format |
| Developer | Aldus, Adobe systems |
| Overview | TIFF or TIF is particularly used by graphic artists and photographers to store the raster images. It is very easy to scan and fax under this extension. It offers other features as well like word processing, image manipulation, optical character recognition and DTP (Desktop publishing)- which use page layout software. Earlier it was capable of storing two values of each pixel that is why it was only binary image format but now it can have both grayscale images and colour images. It has become more popular due to its wide acceptance of deep-colour photographs. Besides this, it can also have a vector-based clipping path which comprises of outlines and cropping. |
| Technical description | The photos have a high quality of graphics as this format supports colour depths from 1 to 24 bits. A single TIFF file can also include header tags which define the geometry of an image like size, definition, image-data arrangement and applied image compression. It offers LZW (Lempel-Ziv-Welch) compression which follows a lossless algorithm to reduce the size of a file. Hence, these files can be edited and saved again without any loss of image quality. It also reserves the information of compression method and by default, the value is one, which means no compression. Furthermore, this format uses 32- bit offsets, which restricts the file size to 4 GiB (Gibibytes). Some variants may also use 64-bit offsets to provide compatibility to large files. It should be noted that every file of this type begins with a two-byte indicator of byte order. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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