From original image to threshold(WK8_1)

Sometimes people want to use an image with only black and dark black for some purposes of illustrating. this is quite easy with the help from Photoshop. It's quite easy: firstly, open the image that you want to get a piece of it, double click on background layer to let it becomes layer 0 . Use pen tool (Ctrl+P) to trace the area that you want to select in a new layer. After tracing it successfully, right click and choose make selection and it becomes a selected area. Next, go to Image\adjustment\threshold and save the image as type that you expected.