1) draw sketches on white paper first. Note that line drawing is not necessary.

The way of line drawing can be varied. It can be either a thin line or a single line drawing, depending on the texture of the fabric.

The reason why it is done on paper is that it is easier to paint and draw lines on paper.

Direct painting in PHOTOSHOP can not achieve such a smooth result.

2) scan the outline to the computer.

(note that the resolution of scanning is preferably 300 pixels / inch).

3) open the line drawing in PHOTOSHOP, copy the outline map with a magic wand tool to a new layer, fill the original layer with white, and copy the layer as the "Outline".

4) adjust the brightness and contrast of the "contour layer" (menu image adjustment brightness contrast). Finally, it appears that the background is white and the line is black.

At this point, you can constantly use the tools of selection, movement and distortion to adjust and modify the outline and scale of the outline.

5) click on the white part of the outline layer with magic wand, then right click - select the similarity - select all white, select all white parts after removing, so that there is only the outline in the computer, and the other parts are pparent. In the back of the picture, we need to put the "outline layer" on the top and always put it on the top.