There are many ways you can do that.
Here is one:
pathToFiles = "/yourPath/..";
SetDirectory[pathToFiles];
newPath = FileNameJoin[{pathToFiles, "newPath"}];
If[!DirectoryQ[newPath],
CreateDirectory[newPath];
];
files = FileNames["*.jpg", pathToFiles];
Export[FileNameJoin[{newPath, FileNameTake[#, -1]}], ImageAdjust[GradientOrientationFilter[Import[#], 4]]] & /@ files