MbufCopyColor

This function copies one or all color bands of the specified source buffer to the specified destination buffer. It can also be used to retrieve or replace a color component from a color image.

If the source is a monochrome buffer and the destination is a multi-band (color) buffer, the source buffer band is copied into the specified band of the destination buffer. If the source is a multi-band buffer and the destination is a monochrome buffer, the specified source buffer band is copied from the source buffer and written to the destination buffer. If both are multi-band buffers, the specified band(s) is copied from the source to the destination.

If the source buffer depth is greater than that of the destination, the most significant bits are truncated when the data is copied to the destination. If the destination depth is greater than that of the source, the source data is zero or sign-extended (depending on the type of the source) when copied to the destination. Also, the buffers must have the same number of bands if all bands are to be copied.

Note, when copying from a non-binary buffer to a binary buffer, all non-zero pixels in the source buffer are represented as ones (1) in the binary buffer. When copying a binary buffer to a buffer of a different depth, each bit is copied into the least-significant bit of a different destination pixel. The remaining bits of the destination pixel are set to 0; to propagate the bit value to all bits, use MimBinarize().

Note, if the source is a 1-band image buffer associated with a LUT buffer and the destination is a 3-band image buffer, the source data copied to destination is first mapped through the LUT.

You can limit this function's results to a region of an image buffer using a region of interest (ROI) set using MbufSetRegion(). The ROI must be defined in raster format (M_RASTER or M_VECTOR_AND_RASTER). An error is generated if the ROI is only in vector format (M_VECTOR). If you specify multiple image buffers with an ROI, results are limited to the portion of the ROIs that intersect.