thanks lulia for your response
actually my need is to apply a same routine to almost all photos in wp gallery and native crop feature does not do that (as far as i know.)
I thought your plugin does the crop without changing photo quality (means cutting a part of photo and save the rest.) but by your explanation i underestand that it is more resize tool other than crop tool.
i may confuse the resize/crop logic since i am not a professional photo editor.
