Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your PEF images to ICO format. This tool works for both professionals and casual users. Convert your images to ICO in seconds.
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Pentax Electronic File
Pentax's native raw format, offering a choice against DNG.
PEF is the proprietary raw image format used by Pentax (Ricoh) cameras. Uniquely, Pentax DSLRs (like the K-1 and K-3) allow users to choose between saving files as PEF or Adobe DNG in-camera. PEF files contain the raw sensor data and proprietary metadata that is optimized for Pentax's own software.
PEF is a TIFF-based format using lossless compression. It is functionally very similar to DNG, but because it is proprietary, it may contain specific 'MakerNotes' that third-party software might not fully decode (though this is rare nowadays).
Pentax has used PEF since their first digital SLRs. Despite adopting DNG as an in-camera option, they have kept PEF as the default native format.
Microsoft Icon
The standard format for icons on Microsoft Windows and the web (favicons).
The ICO format is a container for one or more images at multiple sizes and color depths. It allows a single file to store appropriate icons for different display contexts (e.g., 16x16 for menus, 256x256 for desktop). It supports transparency and, in modern versions, PNG compression.
ICO files contain a header followed by an icon directory that lists each image entry. Each entry can use either BMP (uncompressed) or PNG compression. The format supports 1, 4, 8, 16, 24, and 32-bit color depths with optional alpha channels.
Introduced with Microsoft Windows 1.0. It became the standard for website favicons with the release of Internet Explorer 5.
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