ImageGear for C and C++ on Windows v19.4 - Updated
IG_colorspace_conversion_create
API Reference Guide > Core Component API Reference > Core Component Functions Reference > Color Space Conversion Functions > IG_colorspace_conversion_create

This function creates conversion engine based on the source and the result color space attributes.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_colorspace_conversion_create(
        enumIGColorSpaceIDs sourceSpace,
        const AT_RGBQUAD* sourceSpaceAttribs,
        const AT_INT* sourceChannelDepths,
        AT_INT sourceChannelCount,
        enumIGColorSpaceIDs resultSpace,
        const AT_INT* resultChannelDepths,
        AT_INT resultChannelCount,
        LPCAT_COLORSPACE_CONVERSION_OPTIONS options,
        HIGCSCONVERTER* hCSConverter
);

Arguments:

Name Type Description
sourceSpace enumIGColorSpaceIDs Color space from which to convert.
sourceSpaceAttribs const AT_RGBQUAD* Source color space attributes.
sourceChannelDepths const AT_INT* Array of channel depths for source color space.
sourceChannelCount AT_INT Number of channels in source color space.
resultSpace enumIGColorSpaceIDs Color space to which to convert.
resultChannelDepths const AT_INT* Array of channel depths in resulting color space.
resultChannelCount AT_INT Number of channels in resulting color space.
options LPCAT_COLORSPACE_CONVERSION_OPTIONS Conversion options.
hCSConverter HIGCSCONVERTER* Handle of color space converter.

Return Value:

Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.

Sample:

None

Example:

 
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/* Use the color space converter to convert an image 
   from CMYK to 24-bit RGB, no alpha or extra channels */
AT_ERRCOUNT nErrcount;  /* Number of errors on stack */
HIGCSCONVERTER hCSConv; /* Color space converter handle */
HIGEAR hImage;          /* HIGEAR handle of image */
AT_INT depthsCMYK[] = { 8, 8, 8, 8 }; /* CMYK channel depths */
AT_INT depthsRGB[] = { 8, 8, 8 };     /* RGB channel depths */
nErrcount = IG_colorspace_conversion_create(
    IG_COLOR_SPACE_ID_CMYK, NULL, depthsCMYK, 4, 
    IG_COLOR_SPACE_ID_RGB, depthsRGB, 3, 
    NULL, &hCSConv);
nErrcount = IG_colorspace_conversion_apply_to_image(
    hCSConv, hImage);
nErrcount = IG_colorspace_conversion_destroy(hCSConv);

Remarks:

NULL is an acceptable value for resultChannelDepths. In this case the result channels will be constructed using IG_colorspace_conversion_result_channels_build() routine. Options controls the conversion flow. You may pass NULL for Options if you don't want to specify any options.

For the detailed information about AT_COLORSPACE_CONVERSION_OPTIONS structure and the whole color conversion process please refer to the section Working with Color Space Conversion Engine.