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 Function Icon |
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Add Function icon to cartIcon sizes: 256x256, 64x64, 48x48, 32x32, 24x24, 16x16
File formats: ICO, GIF, PNG, BMP
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What Are PNG Icons?
Many independent vendors are providing custom icons in sizes and resolutions common to certain computer platforms. The article explains what icons are, how they are used and implemented in various systems, and what standards exist for Windows icons, Mac icons, and PNG icons.Computer icons are incorporated into any modern GUI. Icons are small pictures of standardized sizes that depict objects, actions, and other concepts. In window-based systems, icons are used as a faster, more intuitive way to communicate with the user. Icons representing typical elements of a user interface are better visible than text, can be recognized faster, and are easier for new computer users.
Originally developed in 1970 by the Xerox Research Center and widely deployed by the Mac OS and Microsoft Windows platforms, icons make new users feel more comfortable with computer systems, learn faster and work more efficiently. Icons can be employed to replace or supplement text messages. Widely used in menus, toolbars, on buttons and in the latest ribbon-type user interfaces, icons have come a long way from the original concept.
There are several graphic formats for storing icons. The Windows systems use Windows icons in the platform-dependent ICO format. Apple Macintosh systems store Mac icons in their specific formats, while Unix-based systems use PNG icons for most applications. As such, icon editing software is generally available for the Windows and Mac OS systems, while Unix users can design their icons with any image editor.
As a rule of thumb, icons are square images that come in a variety of standard sizes and color resolutions. Most systems support icons of 16x16 to 128x128 pixels, while some systems readily accept icons as large as 512x512 pixels. The big 512x512 pixel icons were first used in Mac OS Leopard.
Pixel resolutions of all icons are platform dependent. For example, Windows icons are defined as images in 16 and 256-color gammas as well as True Color pictures with alpha channel. Windows icons are supplied in standard sizes of 16x16, 32x32, and 48x48 pixels. Windows Vista implements new standards for Windows icons, including icons in sizes of up to 256x256 pixels in True Color only. Optionally, icons of 128x128 and 512x512 pixels are supported. Interestingly, the high-resolution Windows Vista icons are stored in compressed PNG format instead of Windows ICO used in older versions of Windows and for lower resolution images. Other platforms such as Windows Mobile can employ standard icons of other resolutions, such as 24x24 pixels.
Numerous independent designers are offering custom icons. Aha-Soft offers a variety of Windows icons, Mac icons, and PNG icons in all sizes and resolutions standard to those systems. The company sells royalty-free icons individually and in matching sets incorporating icons drawn a common style or theme.
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