clear dots on edge commands

[like_php]

Hello all

i am new at imagemagik developement.
i try create clear edges photos but not working with me, always have dots and dont know how to clean it, see this photo as an example:
orginal photo:

converted image:


and this is a code i used

Code: Select all

exec('convert bill.jpg -flatten -colorspace GRAY -negate -edge 3 -negate -normalize -threshold 9% -despeckle -contrast-stretch 0x100% bill.png');

thanks in advanced

[fmw42]

the dots are Bill Gates freckles in his face. try doing a -median or -selective blur before edge detection or try using -morphology open after edge detection

see http://www.imagemagick.org/Usage/morphology/