IG_image_channel

This function copies pixel data from one channel to another channel.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_image_channel_update( LPCAT_CHANNEL_REF channelToUpdateWith, LPCAT_CHANNEL_REF channelToBeUpdated );

Arguments:

Name	Type	Description
channelToUpdateWith	LPCAT_CHANNEL_REF	Channel to use as source channel.
channelToBeUpdated	LPCAT_CHANNEL_REF	Channel to be replaced by source channel.

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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/* Alter a 24-bit RGB image to use the red channel data for both red and blue channels / AT_ERRCOUNT nErrcount; / Number of errors on stack / HIGEAR hImage; / Handle of source image / AT_CHANNEL_REF chanSrc; / Channel to update from / AT_CHANNEL_REF chanDst; / Channel to update */ nErrcount = IG_load_file("test.jpg", &hImage); chanSrc.hImage = hImage; chanSrc.uNumber = 0; chanDst.hImage = hImage; chanDst.uNumber = 2; nErrcount = IG_image_channel_update(&chanSrc, &chanDst); nErrcount = IG_save_file(hImage, "test.bmp", IG_SAVE_BMP_UNCOMP); IG_image_delete(hImage);

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/* Alter a 24-bit RGB image to use the red channel data 
for both red and blue channels */
AT_ERRCOUNT nErrcount;  /* Number of errors on stack */
HIGEAR hImage;          /* Handle of source image */
AT_CHANNEL_REF chanSrc; /* Channel to update from */
AT_CHANNEL_REF chanDst; /* Channel to update */
nErrcount = IG_load_file("test.jpg", &hImage);
chanSrc.hImage = hImage;
chanSrc.uNumber = 0;
chanDst.hImage = hImage;
chanDst.uNumber = 2;
nErrcount = IG_image_channel_update(&chanSrc, &chanDst);
nErrcount = IG_save_file(hImage, "test.bmp", 
    IG_SAVE_BMP_UNCOMP);
IG_image_delete(hImage);

Remarks:

Each channel is specified by a HIGEAR image handle and the channel's index within that image. The source and destination channels can reside in different images or the same image.