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Icon sizes: 512x512, 256x256, 128x128, 100x100, 64x64, 48x48, 32x32, 24x24, 16x16
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What Are PNG Icons?

A number of independent vendors are offering custom icons in sizes and resolutions standard to certain systems. The article explains what icons are, how they are used and implemented in various platforms, and what standards exist for Windows icons, Mac icons, and PNG icons.

Computer icons are incorporated into any graphical user interface. Icons are small pictograms of standard 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 common elements of a user interface are more visually appealing than text, can be recognized faster, and are certainly easier on the eyes.

Originally developed in 1970 by the Xerox Research Center and widely popularized by the Apple Macintosh and Microsoft Windows systems, icons make computer novices feel more comfortable with computer systems, learn quicker and work more efficiently. Icons can be employed to replace or supplement text messages. Widely used in menus, toolbars, on buttons and in new ribbon-type user interfaces, icons have come a long way from the original concept.

There are multiple image formats for storing icons. Microsoft Windows systems store Windows icons in the platform-dependent ICO format. Mac OS computers use Mac icons in their specific formats, while Unix-based systems employ PNG icons for most applications. As such, icon software is generally available for the Windows and Apple platforms, while Unix users can create their icons with any image editor.

Generally speaking, icons are square pictograms that come in a number of standard sizes and color resolutions. Most platforms use icon sizes of 16x16 to 128x128 pixels, while some platforms readily accept icon images as large as 512x512 pixels. The ultra-high definition 512x512 pixel icons were first employed in Mac OS Leopard.

Pixel resolutions of all icons are platform dependent. For example, Windows icons are specified as images in 16 and 256-color gammas as well as True Color pictures with alpha channel. Windows icons come 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 higher resolution versions of Windows Vista icons are stored in compressed PNG format instead of Windows ICO used in previous versions of Windows and for lower resolution icons. Other platforms such as Windows Mobile can use standard icons of other sizes, such as 24x24 pixels.

Many independent designers are offering custom icons. Aha-Soft offers a wide selection of Windows icons, Mac icons, and PNG icons in all sizes and resolutions common to those platforms. The company provides royalty-free icons individually and in matching sets incorporating icons drawn a common style or theme.

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Download Large Symbol Icons
Perfect Science Icons Labaratory software and Web-site developers will certainly appreciate this rare pack of scientific icons. Presenting various symbols and objects used in all the fields of science and engineering, Perfect Science Icons are a great value.

24x24 Free Application Icons 24x24 Free Application Icons pack has everything you need for your web project or software toolbar.

Perfect Business Icons Enhance your accounting or business- related software with readily available quality Perfect Business Icons. More then two hundred of beautifully designed and carefully drawn icons are available.

Science Icon Set Science Icon Set brings you all the graphics, that are needed to create a laboratory application or scientific Web project. This set includes mathematics, chemical and biology icons.

Medical Icons for Vista Medical Icons for Vista has been design to avoid any misunderstanding arising while viewing a medical Web site or operating a medical program. The images are available in various sizes and formats.