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PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and full-color non-palette-based RGB or RGBA images. The PNG working group designed the format for transferring images on the Internet, not for professional-quality print graphics ...
One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image .
The first Wikipedia logo. In January 2001, Jimmy Wales used the flag of the United States as a placeholder logo for Wikipedia's UseModWiki instance. [4] Wikipedia's first true logo was an image originally submitted by Bjørn Smestad – under the username Bjornsm – for a Nupedia logo competition which took place in 2000. [5]
RT_ICON and RT_CURSOR resources have the same image data format as in ICO files and can store PNG images as well. Additionally, first four bytes of RT_CURSOR resource data contain the cursor hotspot data, as two WORD (16 bit) values (in contrast to CUR files, in which hotspot data is contained in the ICONDIRENTRY structure).
Wikipedia's favicon, shown in Firefox. A favicon (/ ˈ f æ v. ɪ ˌ k ɒ n /; short for favorite icon), also known as a shortcut icon, website icon, tab icon, URL icon, or bookmark icon, is a file containing one or more small icons [1] associated with a particular website or web page.
In computing, an icon is a pictogram or ideogram displayed on a computer screen in order to help the user navigate a computer system.The icon itself is a quickly comprehensible symbol of a software tool, function, or a data file, accessible on the system and is more like a traffic sign than a detailed illustration of the actual entity it represents. [1]
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The first and the most desirable in icon design practice is using conventional images. If there is no conventional pictogram for the particular icon, a designer can use a literal image, including an image that is shared by the main concept (for example printer is shared image for printing concept), or metaphorical image.