Edge enhancement using Unsharp mask. stddev control the gaussian filter,
* amount controls how much the edges will enhance the image (0<amount<1), and
* threshold controls which edges will be considered, it compares to twice of the absolute size of the edge.
* Although very similar to \ref imProcessSharp, produces better results.
*
* \verbatim im.ProcessUnsharp(src_image: imImage, dst_image: imImage, stddev: number, amount: number, threshold: number) [in Lua 5] \endverbatim
* \verbatim im.ProcessUnsharpNew(image: imImage, stddev: number, amount: number, threshold: number) -> new_image: imImage [in Lua 5] \endverbatim
* \ingroup convolve
Edge enhancement using Unsharp mask. stddev control the gaussian filter, * amount controls how much the edges will enhance the image (0<amount<1), and * threshold controls which edges will be considered, it compares to twice of the absolute size of the edge. * Although very similar to \ref imProcessSharp, produces better results. * * \verbatim im.ProcessUnsharp(src_image: imImage, dst_image: imImage, stddev: number, amount: number, threshold: number) [in Lua 5] \endverbatim * \verbatim im.ProcessUnsharpNew(image: imImage, stddev: number, amount: number, threshold: number) -> new_image: imImage [in Lua 5] \endverbatim * \ingroup convolve