ImageGear .NET v25.2 - Updated
Developer Guide / File Formats and Compressions / File Formats / File Formats Reference / IOCA
In This Topic
    IOCA
    In This Topic
    Full Name IBM IOCA (Image Object Content Architecture)
    Format ID ImGearFormats.ICA
    File Extension(s) *.ica, *.mod
    Data Type Raster Image
    Data Encoding Binary
    Multi-Page Support Yes
    Alpha Channel Support No
    Metadata Update Support No
    ImageGear Platforms Support WIN32, WIN64, Unix, Unix64, .NET, .NET64, MAC

    ImageGear Supported Versions

    N/A

    ImageGear Supported Features

    ImageGear Read Support

    ImageGear Write Support

    ImageGear Filter Control Parameters

    None

    Comments

    IOCA files are most often used for document storage. They are not so unusual from most file formats, except for their naming conventions, which tend to be IBM-specific.

    The general structure of an IOCA image file includes a "beginning segment", an "end segment", a header component called "Image Data Parameters", a palette, and the actual image data. Most IOCA images (less than 24-bit) contain a palette. The elements of the bitmap image are referred to as Image Data Elements (IDEs), that are called pixels by most other formats. The "Object Content" refers to the combination of the header and the image data.

    IBM uses fields in the header called "self-defining fields". They each contain a type code, the length of the parameter, and then the actual parameter data. They include information as resolution, size, encoding scheme, and bit depth.

    There are many optional parameters. Subsets of IOCA parameters define different flavors of the IOCA, one being the MODCA, also supported by ImageGear. Examples of optional parameters include a tiling parameter, if the image is tiled, and a Band Image parameter, which signifies that the image is saved in "bands" ("bit planes" in other formats).

    References Used

    Image Object Content Architecture Reference, 2d ed., copyright International Business Machines Corporation, August 1991.