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 Lung Cancer Icon |
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Add Lung Cancer icon to cartImage sizes: 1024x1024, 512x512, 256x256, 128x128, 64x64, 48x48, 32x32, 24x24, 16x16
File formats: BMP, GIF, PNG, ICO
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What Are PNG Icons?
Numerous independent vendors are offering custom icons in sizes and resolutions common to certain computer platforms. The article explains what icons are, how they are designed and implemented in various platforms, and what standards are defined for Windows icons, Mac icons, and PNG icons.Computer icons are an integral part of any graphical user interface. Icons are small pictograms of standard sizes that visually represent objects, actions, and other concepts. In graphical user interfaces, icons are used as a faster, more intuitive way to communicate with the user. Icons depicting typical 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 deployed by the Mac OS and Microsoft Windows platforms, icons make new users feel more comfortable with operating systems, learn faster and work more efficiently. Icons can be used to replace or supplement text commands. Commonly 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 several image formats for storing icons. The Windows systems use Windows icons in the platform-dependent ICO format. Mac OS systems 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 systems, while Unix users can design PNG icons with any image editor.
Generally speaking, icons are square images that come in a variety of standard sizes and color resolutions. Most platforms use icons of 16x16 to 128x128 pixels, while some platforms readily accept icon images as large as 512x512 pixels. The big 512x512 pixel icons were first used in Mac OS Leopard.
Pixel resolutions of all icons are operating system dependent. For example, Windows icons are defined as pictures 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 defines new standards for Windows icons, including icons in resolutions 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 employ standard icons of other resolutions, such as 24x24 pixels.
Numerous independent vendors are providing custom icons. Aha-Soft offers a variety of Windows icons, Mac icons, and PNG icons in all sizes and resolutions common to those systems. The company provides royalty-free icons individually and in matching sets incorporating icons drawn a common style or theme.
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