ImageGear v26.5 - Updated
Developer Guide / File Formats and Compressions / File Formats / Format Bit Depths
In This Topic
    Format Bit Depths
    In This Topic

    You may want to convert a file from one format to another. You can do this by saving the original file to its desired format by setting the nFormatType parameter to the appropriate value in the saving method. For more information on converting issues, see the section Loading and Saving.

    When saving a file to another format, remember to ensure that the desired file format is supported for that image. For example, you cannot convert an 8-bit DCX file to an 8-bit CAL file, because the CAL format does not support 8-bit files.

    In the following table, the columns underneath the numbers indicated size in bits that can actually be saved (written). In each cell, a value of "R" indicates read-only support, and a value of "RW" indicates that ImageGear reads and writes the corresponding file format.

    Format 1 4 8 9-16 24 32 36 48 64 Notes
    BMP RW RW RW RW RW R
    CLP RW RW RW RW
    CUR RW RW RW RW Also supports Extra ((1, 3, 4, 8)*2)-bit images.
    DIB RW RW RW R RW R
    DOCX Read-only support. Specific bit-depths are not considered.
    DOC Read-only support. Specific bit-depths are not considered.
    DNG R R
    GIF RW RW RW
    JPEG RW RW RW RW RW RW 8-bit grayscale.
    PDF RW RW RW RW RW
    PPTX Read-only support. Specific bit-depths are not considered.
    PPT Read-only support. Specific bit-depths are not considered.
    PNG RW RW RW RW RW RW RW RW Supports 48(RGB)- and 64(RGB+alpha)-bit images.
    PS RW RW RW RW RW
    RAW R R R R R R R R
    SVG Write-only support. Specific bit-depths are not considered.
    TIFF RW RW RW RW RW RW RW RW RW Read only supports 3- and 6- bpp for RGB and LAB color spaces for Deflate Compression, LZW (Lempel-Ziv-Welch) Compression, Packbits Compression and uncompressed.
    XLSX Read-only support. Specific bit-depths are not considered.
    XLS Read-only support. Specific bit-depths are not considered.