LmaskL=src8.mt_lut("x 32 <= 0 255 ?",u=1,v=1)
LmaskM=src8.mt_lut("x 56 <= 0 255 ?",u=1,v=1)
LmaskH=src8.mt_lut("x 128 <= 0 255 ?",u=1,v=1)
preblur=src8
nrmaskg = preblur.tcannyMod(sigma=1.05, t_h=5.5, sobel=true, mode=0).mt_expand(u=1,v=1).mt_expand(u=1,v=1)
nrmaskb = preblur.tcannyMod(sigma=1.30, t_h=6.0, sobel=true, mode=0).mt_expand(u=1,v=1).mt_expand(u=1,v=1)
nrmaskm = preblur.tcannyMod(sigma=1.50, t_h=7.0, sobel=true, mode=0).mt_expand(u=1,v=1).mt_expand(u=1,v=1)
nrmasks = preblur.tcannyMod(sigma=2.60, t_h=8.0, sobel=true, mode=0).mt_expand(u=1,v=1).mt_expand(u=1,v=1)