ESF2LSF: fixed negativity bug

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_Imaging/gtESF2LSF.m

@@ -109,7 +109,7 @@ function lsf_line = gtESF2LSF(img, varargin)
                 lsf(1:lsf_edge) = flip(lsf(lsf_edge+2:end));
             end
     end
-    lsf(lsf < 0) = 0;
+%     lsf(lsf < 0) = 0;
     if (~conf.keep_oversampling)
         lsf = reshape(lsf, conf.oversampling, conf.size);
         lsf = sum(lsf, 1);