Dark　channel　prior　is　a　highly　valued　theory　mostly　used　in　the　area　of　haze　removal.　It　reveals　the　wide　existence　of　pixels　with　very　small　channel.　However,　the　definition　is　in　a　decorated　way　that　relies　on　the　concept　of　dark　channel.　The　dark　channel　works　like　an　image　domain　wherein　non-sky　regions　of　clear　outdoor　images　are　close　to　zero.　In　this　letter　we　show　that,　such　a　concept　is　unnecessary　and　misleading,　and　can　be　improved　by　using　a　more　basic　concept　named　dark　pixel.　A　novel　transmission　estimation　method　based　on　finding　dark　pixels　is　proposed.　The　method　is　concise　and　easy　to　understand.　In　comparisons　with　state-of-the-art　methods,　our　method　shows　significant　improvements　on　both　transmission　estimation　and　haze　removal　results.