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Graphics Interchange Format

The Graphics Interchange Format (GIF) is a bitmap image format that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability. The format supports up to 8 bits per pixel thus allowing a single image to reference a palette of up to 256 distinct colors. The colors are chosen from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images with continuous color, but it is well-suited for simpler images such as graphics or logos with solid areas of color.
GIF images are compressed using the Lempel-Ziv-Welch (LZW) lossless data compression technique to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. Controversy over the licensing agreement between the patent holder, Unisys, and CompuServe in 1994 spurred the development of the Portable Network Graphics (PNG) standard; since then all the relevant patents have expired.

GIF Palettes

GIF is palette-based: the colors used in an image (a frame) in the file have their RGB values defined in a palette table that can hold up to 256 entries, and the data for the image refer to the colors by their indexes (0–255) in the palette table. The color definitions in the palette can be drawn from a color space of millions of shades (224 shades, 8 bits for each primary), but the maximum number of colors a frame can use is 256. This limitation seemed reasonable when GIF was developed because few people could afford the hardware to display more colors simultaneously. Simple graphics, line drawings, cartoons, and grey-scale photographs typically need fewer than 256 colors.
As a further refinement, each frame can designate one index as a "transparent background color": any pixel assigned this index takes on the color of the pixel in the same position from the background, which may have been determined by a previous frame of animation.
Many techniques, collectively called dithering, have been developed to approximate a wider range of colors with a small color palette by using pixels of two or more colors to approximate in-between colors. These techniques sacrifice spatial resolution to approximate deeper color resolution. While not part of the GIF specification, dithering can of course be used in images subsequently encoded as GIF images. This is often not an ideal solution for GIF images, both because the loss of spatial resolution typically makes an image look fuzzy on the screen, and because the dithering patterns often interfere with the compressibility of the image data, working against GIF's main purpose.
In the early days of graphical web browsers, graphics cards with 8-bit buffers (allowing only 256 colors) were common and it was fairly common to make GIF images using the websafe palette.[citation needed] This ensured predictable display, but severely limited the choice of colors. Now that 32-bit graphics cards, which support 24-bit color, are the norm, palettes can be populated with the optimum colors for individual images.
A small color table may suffice for small images, and keeping the color table small allows the file to be downloaded faster. Both the 87a and 89a specifications allow color tables of 2n colors for any n from 1 through 8. Most graphics applications will read and display GIF images with any of these table sizes; but some do not support all sizes when creating images. Tables of 2, 16, and 256 colors are widely supported.

Logo

A logo is a graphic mark or emblem commonly used by commercial enterprises, organizations and even individuals to aid and promote instant public recognition. Logos are either purely graphic (symbols/icons) or are composed of the name of the organization (a logotype or wordmark).
In the days of hot metal typesetting, a logotype was a uniquely set and arranged typeface or colophon. At the level of mass communication and in common usage a company's logo is today often synonymous with its trademark or brand.

Logo history

Numerous inventions and techniques have contributed to the contemporary logo, including cylinder seals (c.2300 BCE), coins (c.600 BCE), trans-cultural diffusion of logographic languages, coats of arms, watermarks, silver hallmarks and the development of printing technology.
As the industrial revolution converted western societies from agrarian to industrial in the 18th and 19th centuries, photography and lithography contributed to the boom of an advertising industry that integrated typography and imagery together on the page.Simultaneously, typography itself was undergoing a revolution of form and expression that expanded beyond the modest, serif typefaces used in books, to bold, ornamental typefaces used on broadsheet posters.
The arts were expanding in purpose—from expression and decoration of an artistic, storytelling nature, to a differentiation of brands and products that the growing middle classes were consuming. Consultancies and trades-groups in the commercial arts were growing and organizing; by 1890 the US had 700 lithographic printing firms employing more than 8,000 people. Artistic credit tended to be assigned to the lithographic company, as opposed to the individual artists.
Innovators in the visual arts and lithographic process—such as French printing firm Rouchon in the 1840s, Joseph Morse of New York in the 1850s, Frederick Walker of England in the 1870s, and Jules Chéret of France in the 1870s—developed an illustrative style that went beyond tonal, representational art to figurative imagery with sections of bright, flat colors. Playful children’s books, authoritative newspapers, and conversational periodicals developed their own visual and editorial styles for unique, expanding audiences. As printing costs decreased, literacy rates increased, and visual styles changed, the Victorian decorative arts lead to an expansion of typographic styles and methods of representing businesses.
The First logo to be trademarked was the Bass red triangle in 1876
The Arts and Crafts Movement of late-19th century, partially in response to the excesses of Victorian typography, aimed to restore an honest sense of craftsmanship to the mass-produced goods of the era. A renewal of interest in craftsmanship and quality also provided the artists and companies with a greater interest in credit, leading to the creation of unique logos and marks.
By the 1950s, Modernism had shed its roots as an avant-garde artistic movement in Europe to become an international, commercialized movement with adherents in the United States and elsewhere. The visual simplicity and conceptual clarity that were the hallmarks of Modernism as an artistic movement formed a powerful toolset for a new generation of graphic designers whose logos embodied Ludwig Mies van der Rohe’s dictum, "Less is more." Modernist-inspired logos proved successful in the era of mass visual communication ushered in by television, improvements in printing technology, and digital innovations.

Logo design

Logo design is an important area of graphic design, and one of the most difficult to perfect. The logo (ideogram), is the image embodying an organization. Because logos are meant to represent companies' brands or corporate identities and foster their immediate customer recognition, it is counterproductive to frequently redesign logos.
Color is considered important to brand recognition, but it should not be an integral component to the logo design, which could conflict with its functionality. Some colors are formed/associated with certain emotions that the designer wants to convey. For instance loud primary colors, such as red, are meant to attract the attention of drivers on highways are appropriate for companies that require such attention. In the United States red, white, and blue are often used in logos for companies that want to project patriotic feelings. Green is often associated with the health and hygiene sector, and light blue or silver is often used to reflect diet foods. For other brands, more subdued tones and lower saturation can communicate reliability, quality, relaxation, or other traits.
The logo design profession has substantially increased in numbers over the years since the rise of the Modernist movement in the United States in the 1950s. Three designers are widely considered the pioneers of that movement and of logo and corporate identity design: The first is Chermayeff & Geismar, which is the firm responsible for a large number of iconic logos, such as Chase Bank (1964), Mobil Oil (1965), PBS (1984), NBC (1986), National Geographic (2003) and others. Due to the simplicity and boldness of their designs, many of their earlier logos are still in use today. The firm recently designed logos for the Library of Congress and the fashion brand Armani Exchange. Another pioneer of corporate identity design is Paul Rand,[14] who was one of the originators of the Swiss Style of graphic design. He designed many posters and corporate identities, including the logos for IBM, UPS, and ABC. The third pioneer of corporate identity design is Saul Bass.[15] Bass was responsible for several recognizable logos in North America, including both the Bell Telephone logo (1969) and successor AT&T globe (1983). Other well-known designs were Continental Airlines (1968), Dixie (1969), and United Way (1972). Later, he would produce logos for a number of Japanese companies as well. Charmayeff, Rand and Bass all died in 1996.

Internet-compatible logos

A company that use logotypes (wordmarks) may desire a logo that matches the firm's Internet Address. For short logotypes consisting of two or three characters, multiple companies are found to employ the same letters. A "CA" logo, for example, is used by the French Bank Credit Agricole, the Dutch Clothing Retailer C&A and the US Software Corporation CA Technologies, but only one can have the internet domain name CA.com.
In today's interface adaptive world, the use of a logo will be formatted and re-formatted from large monitors to small handheld devices. With the constant size change and re-formatting, logo designers are shifting to a more bold and simple approach, with heavy lines and shapes, and solid colors. This reduces the confusion when mingled with other logos in tight spaces and when stretched and squeezed between mediums.

GIF Usage

GIFs are suitable for sharp-edged line art (such as logos) with a limited number of colors. This takes advantage of the format's lossless compression, which favors flat areas of uniform color with well defined edges.
GIFs can be used to store low-color sprite data for games.
GIFs can be used for small animations and low-resolution film clips.
In view of the general limitation on the GIF image palette to 256 colors, it is not usually used as a format for digital photography. Digital photographers use image file formats capable of reproducing a greater range of colors, such as TIFF, RAW or JPEG.

GIF File format

Conceptually, a GIF file describes a fixed-sized graphical area (the "logical screen") populated with zero or more "images". Many GIF files have a single image that fills the entire logical screen. Others divide the logical screen into separate sub-images. The images may also function as animation frames in an animated GIF file, but again these need not fill the entire logical screen.
GIF files start with a fixed-length header ("GIF87a" or "GIF89a") giving the version, followed by a fixed-length Logical Screen Descriptor giving the size and other characteristics of the logical screen. The screen descriptor may also specify the presence and size of a Global Color Table, which follows next if present.
Thereafter, the file is divided into segments, each introduced by a 1-byte sentinel:
An image (introduced by 0x2C, a comma ',')
An extension block (introduced by 0x21, an exclamation point '!')
The trailer (a single byte of value 0x3B, a semi-colon ';'), which should be the last byte of the file.
An image starts with a fixed-length Image Descriptor, which may specify the presence and size of a Local Color Table (which follows next if present). The image data follow: one byte giving the bit width of the unencoded symbols (which must be at least 2 bits wide, even for bi-color images), followed by a linked list of sub-blocks containing the LZW-encoded data.
Extension blocks (blocks that "extend" the 87a definition via a mechanism already defined in the 87a spec) consist of the sentinel, an additional byte specifying the type of extension, and a linked list of sub-blocks with the extension data. Extension blocks that modify an image (like the Graphic Control Extension that specifies the optional animation delay time and optional transparent background color) must immediately precede the segment with the image they refer to.
The linked lists used by the image data and the extension blocks consist of series of sub-blocks, each sub-block beginning with a byte giving the number of subsequent data bytes in the sub-block (1 to 255). The series of sub-blocks is terminated by an empty sub-block (a 0 byte).
This structure allows the file to be parsed even if not all parts are understood. 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.
The full detail of the file format is covered in the GIF specification

GIF History

CompuServe introduced the GIF format in 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. GIF became popular because it used LZW data compression, which was more efficient than the run-length encoding that formats such as PCX and MacPaint used, and fairly large images could therefore be downloaded in a reasonably short time, even with very slow modems.
The original version of the GIF format was called 87a. In 1989, CompuServe devised an enhanced version, called 89a,[1] which added support for animation delays (multiple images in a stream were already supported in 87a), transparent background colors, and storage of application-specific metadata. The 89a specification also supports incorporating text labels as text (not embedding them in the graphical data), but as there is little control over display fonts, this feature is not widely used. The two versions can be distinguished by looking at the first six bytes of the file (the "magic number" or "signature"), which, when interpreted as ASCII, read "GIF87a" and "GIF89a", respectively.
GIF was one of the first two image formats commonly used on Web sites, the other being the black and white XBM.[citation needed]
The feature of storing multiple images in one file, accompanied by control data, is used extensively on the Web to produce simple animations. The optional interlacing feature, which stores image scan lines out of order in such a fashion that even a partially downloaded image was somewhat recognizable, also helped GIF's popularity,[citation needed] as a user could abort the download if it was not what was required.

GIF True color

True color
Although GIF is not often used for truecolor images (as it was not designed for that purpose), there are at least two methods that can generate 24-bit RGB truecolor images when decoded correctly.
GIF is designed, even in the earlier GIF87a specification, on the principle of rendering multiple images onto a fixed-sized logical screen. Each image can have its own 256-color palette, so that the logical screen can be tiled with multiple smaller images, which together can use any selection of colors from the 24-bit RGB color space.
Another technique uses the transparency feature introduced in GIF89a: a GIF file can be constructed as a series of overlapping full-screen images, each image filling in colors from a local color table that weren't in the previous ones. In this case transparent pixels are used to preserve colors from previous stages.

Logos today

The current era of logo design began in the 1870s with the first abstract logo, the Bass red triangle. Today there are many corporations, products, brands, services, agencies and other entities using an ideogram (sign, icon) or an emblem (symbol) or a combination of sign and emblem as a logo. As a result, only a few of the thousands of ideograms people see are recognized without a name. An effective logo may consist of both an ideogram and the company name (logotype) to emphasize the name over the graphic, and employ a unique design via the use of letters, colors, and additional graphic elements. The Coca-Cola logo is identifiable in other languages, here written in Cyrillic. Ideograms and symbols may be more effective than written names (logotypes), especially for logos translated into many alphabets in increasingly globalised markets. For instance, a name in the Arabic language would be of little help in most European markets. By contrast, ideograms keep the general proprietary nature of the product in both markets. In non-profit areas, the Red Cross (which goes by Red Crescent in Muslim countries) is an example of an extremely well known emblem which does not need an accompanying name. Branding aims to facilitate cross-language marketing. The Coca-Cola logo can be identified in any language because of its standard color and well known "ribbon wave" design.

Psychology of symbols

The effective design and use of a logo employs the understanding of human behavior. Whether cultural, or internal, people recognize and react to color, shapes, lines, fonts and other symbolic forms with emotions tied to their experiences.
Colors have a broad range of meaning according to different nations and cultures. A color could mean one thing in a particular setting, and something completely different in another.
People's minds have been trained to recognize the motion of a line. Horizontal lines often communicate a leveled security. Vertical lines convey dignity, and diagonal lines are full of energy, suggesting either rising or falling, or movement in one direction or another.

Corporations, businesses and products

Due to the design, the color, the shape, and eventually additional elements of the logotype, each one can easily be differentiated from other logotypes. For example, a box of Kellogg's cereals will be easily recognized in a supermarket's shelf from a certain distance, due to its unique typography and distinctive red coloring. The same will be true when one is at the airport looking for the booth of the Hertz Rent-A-Car company.
Some well-known logos include Apple Inc.'s apple with a bite taken out, which started out as a rainbow of color, and has been reduced to a single color without any loss of recognition. Coca-Cola's script is known worldwide, but is best associated with the color red; its main competitor, Pepsi has taken the color blue, although they have abandoned their script logo. IBM, also known as "Big Blue" has simplified their logo over the years, and their name. What started as International Business Machines is now just "IBM" and the color blue has been a signature in their unifying campaign as they have moved to become an IT services company.
There are some other logos that must be mentioned when evaluating what the mark means to the consumer. Automotive brands can be summed up simply with their corporate logo—from the Chevrolet "Bow Tie" mark to the roundel marks of Volkswagen, Mercedes-Benz and BMW, to the interlocking "RR" of Rolls-Royce—each has stood for a brand and clearly differentiated the product line.
Other logos that are recognized globally: the Nike "Swoosh" and the Adidas "Three stripes" are two well-known brands that are defined by their corporate logo. When Phil Knight started Nike, he was hoping to find a mark as recognizable as the Adidas stripes, which also provided reinforcement to the shoe. He hired a young student (Carolyn Davidson) to design his logo, paying her $35 for what has become one of the best known marks in the world (she was later compensated again by the company).[17]
Another logo of global renown is that of Playboy Enterprises. Playboy magazine claims it once received a letter at its Chicago, Illinois offices with its distinctive "bunny" logo as the only identifying mark, appearing where the mailing address normally appears.
Corporate identities are often developed by large firms who specialize in this type of work. However, Paul Rand is considered the father of corporate identity and his work has been seminal in launching this field. Some examples of his work were the UPS package with a string (replaced in March 2003 with the "shield"), IBM and NeXT Computer.
An interesting case is the refinement of the FedEx logo, where the brand consultants convinced the company to shorten their corporate name and logo from "Federal Express" to the popular abbreviation "Fed Ex". Besides creating a shorter brand name, they reduced the amount of color used on vehicles (planes, trucks) and saved hundreds of thousands of dollars in paint costs. Also, the right-pointing arrow in the new logo hints at motion.

Logo of Facebook Inc.
Starting about 4 years ago, certain companies, especially online technology companies, began to adopt a common look and feel. Many people refer to that standard as "web 2.0", but there is no official "web 2.0" standard. Web 2.0 logos often use small chunks of large type, with bright and cheery colors. Although there are literally hundreds of fonts used by web 2.0 companies, the logos are generally dominated by soft, rounded san serif fonts such as VAG Rounded (Crowdspring) and Helvetica Rounded (Skype). There are, however, numerous exceptions, as some web 2.0 companies have used classic fonts (Trade, News Gothic, Frutiger, Helvetica), while others have chosen to differentiate completely, using custom lettering like (Facebook).

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