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iConStruct is a utility for programmers (REALBasic and others) that offers a simple way to create icons of various sizes from a given picture file.

iConStruct automatically scales pictures to standard icon sizes and autmatically generates masks based on a specified brightness threshold. For best results, the images that are to be converted to icons should be in front of a white (or very light) background.
For 32-bit icon sets, the masks are generated as 8-bit grayscale images, and mask edges (1 to 15 pixels wide) values are either set to the brightness of the corresponding pixels in the icon, a fixed value chosen by the user, or a black-to-white gradient.
8-Bit icons are generated as dithered versions of the 32-icons using web-safe colors. The corresponding masks are generated as 1-bit B/W images.
The icons and masks can be individually copied and pasted as well as dragged into other applications, or the entire set of icons can be saved as BMP or transparent PNG files.

iConStruct comes without an installer and can be placed anywhere on the harddrive as long as the correct folder structure is maintained. I.e. for the Windows version the "iConStruct Libs" folder must reside in the same location as the "iConStruct.exe" executable.