ico : Java Glossary

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ico
*.ico files are a Microsoft proprietary icon format. It supports transparency, but only square images in a specific set of resulutions. Each layer can have a different palette map or use 32-bit direct colour mapping. Icons can be standalone or embedded in executable files. They typically contain 16 × 16, 24 × 24, 32 × 32, 64 × 64, 128 × 128 and 256 × 256 format all packed into one *.ico file. Vista supports PNG-style image compression of the larger images.

A modern Vista icon contains the following resolutions.

Vista Icon Resolutions
mandatory = mandatory optional = optional
Size 32-bit RGB Colour
alpha transparency		 256 colour 16 colour
256 × 256
64 × 64
48 × 48
32 × 32
24 × 24
16 × 16
Sometimes one or more of the resolutions are left out. Older versions of windows do not support the higher resolutions. You can use special *.ico editors, or create a set of png files then glue them together in a icon with a special utility.

Java does not support them, even for Java webstart icons.

In order of difficulty:

  1. Extract icon from exe. Usually free, e. g. NirSoft IconsExtract NirSoft IconsExtract: free *.ico extractor
  2. Change folder icon. Utilities cost about $20.00 USD
  3. Replace exe icon with one smaller or same size. Utilities cost about $40.00 USD
  4. Replace exe icon with one larger. Utilities cost an outrageous $100.00 USD
bmp
favicon.ico
icon
IconXP
NirSoft IconsExtract: free *.ico extractor
CMP homejump to top You can get the freshest copy of this page from: or possibly from your local J: drive (Java virtual drive/mindprod.com website mirror)
http://mindprod.com/jgloss/ico.html J:\mindprod\jgloss\ico.html
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