is that allowed gif

The GIF Specification allows each image within the logical screen of a GIF file to specify that it is interlaced; i.e., that the order of the raster lines in its data block is not sequential. [9], As a noun, the word GIF is found in the newer editions of many dictionaries. [54] There have been several subsequent proposals for a simple animated graphics format based on PNG using several different approaches.

[30][31][better source needed]. The series of sub-blocks is terminated by an empty sub-block (a 0 byte). When 24-bit color became the norm palettes could instead be populated with the optimum colors for individual images. To render a full-color image as a GIF, the original image must be broken down into smaller regions having no more than 255 or 256 different colors. CompuServe introduced GIF on 15 June 1987 to provide a color image format for their file downloading areas, replacing their earlier run-length encoding (RLE) format, which was black and white only. [36][40], The popularity of LZW led CompuServe to choose it as the compression technique for their version of GIF, developed in 1987. In the early days of graphical web browsers[when? Uncompressed GIF can also be a useful intermediate format for a graphics programmer because individual pixels are accessible for reading or painting. Global information at the start of the file applies by default to all frames. A block of image data begins with a byte that declares the number of bytes to follow. APNG is supported by most browsers as of 2019. Popular on social media platforms such as Tumblr, Facebook and Twitter. Controversy over the licensing agreement between the software patent holder, Unisys, and CompuServe in 1994 spurred the development of the Portable Network Graphics (PNG) standard. This saves considerably on storage space and data transfer bandwidth. A GIF marked 87a may contain extension blocks; the intent is that a decoder can read and display the file without the features covered in extensions it does not understand. In September 1995 Netscape Navigator 2.0 added the ability for animated GIFs to loop. It has since come into widespread usage on the World Wide Web due to its wide support and portability between applications and operating systems.

In 2012, the American wing of the Oxford University Press recognized GIF as a verb as well, meaning "to create a GIF file", as in "GIFing was perfect medium for sharing scenes from the Summer Olympics". Conversely, the symbol width could be set at 8, even if only values 0 and 1 are used; these data would only require a two-color table. Nevertheless, Unisys was subjected to thousands of online attacks and abusive emails from users believing that they were going to be charged $5000 or sued for using GIFs on their websites. Versions 6 and earlier do not support alpha channel transparency without using Microsoft-specific HTML extensions. This structure allows the file to be parsed even if not all parts are understood. Internet Explorer slows down GIFs if the frame-rate is 20 frames per second or higher and Microsoft reports that Google Chrome and Safari also slow down some GIF animations.[34].

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