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Crane Truck Icon Images

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Icon sizes: 48x48, 32x32, 24x24, 20x20, 16x16, 512x512, 256x256
File formats: ICO, GIF, PNG, BMP

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What Are PNG Icons?

A number of independent vendors are providing custom icons in sizes and resolutions standard to certain computer platforms. The article explains what icons are, how they are used and implemented in various systems, and what standards are defined 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 symbols. In window-based systems, icons are used as a quicker, more intuitive way to communicate with the user. Icons representing typical elements of a user interface are more visually appealing than text, can be recognized faster, and are easier for new computer users.

Originally introduced in 1970 by the Xerox Research Center and widely deployed by the Mac OS and Microsoft Windows systems, icons make computer novices feel more comfortable with operating systems, learn faster and interact more efficiently. Icons can be used to replace or supplement text commands. 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 several graphic formats for storing icons. Microsoft Windows systems use Windows icons in the platform-specific ICO format. Mac OS systems store 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 Mac OS systems, while Unix users can design PNG icons with just about any image editor.

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

Pixel dimensions 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 images with alpha channel. Windows icons come in standard resolutions of 16x16, 32x32, and 48x48 pixels. Windows Vista defines 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 icons. Other systems such as Windows Mobile can use standard icons of other sizes, such as 24x24 pixels.

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

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You can buy individual icons to suit your needs. Each icon is $1 when purchased individually.

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Large Weather Icons Large Weather Icons represent a number of weather conditions typical in software, weather Web sites, and mobile gadgets. The images arprovided in typical resolutions standard to Windows, Mac OS, and other platforms. The biggest versions are huge 512x512 pixel icons with vector sources in Adobe Illustrator (.ai) format easily affordable and ready to be printed or used in presentations in highest quality.

Classic Hardware Icon Set Hardware Icon Set is a collection of hardware-related images in a traditional Windows style, provided in PNG, GIF, BMP and ICO formats and 16x16, 24x24 and 32x32 sizes.

Science Icon Set Science Icon Set brings you all the images, that are required to create a laboratory application or scientific Web site. This set contains mathematics, chemical and biology icons.

Medical Icons for Vista Medical Icons for Vista has been design to avoid any misconceptions appearing while looking at a medical webpage or using a medical program. The icons are provided in numerous sizes and formats.

Standard City Icons Design city maps that are flawless on screen and on paper. Standard City Icons come in a variety of sizes and resolutions and in file formats of BMP, GIF, ICO and PNG.