ImageGear for C and C++ on Windows v21.0 - Updated
API Reference Guide / PDF Component API Reference / PDF Component Enumerations Reference / enumIGPDFColorSpace
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    enumIGPDFColorSpace
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    Specifies the color space in which a color value is specified (for example, RGB or Grayscale).

    Values:

    IG_PDF_DEVICE_GRAY Grayscale color specification. Requires 1 value entry to specify the color.
    IG_PDF_DEVICE_RGB Red-Green-Blue color specification. Requires 3 value entries to specify the color.
    IG_PDF_DEVICE_CMYK Cyan-Magenta-Yellow-Black color specification. Requires 4 value entries to specify the color.