1. The Photoshop that start uses a program, open need to adjust the picture of double color, if plan institute is shown.

2. Build graph layer, choose " color of Lab of → of image → mode " command, picture mode the setting is Lab color, if plan institute is shown.

3. Switch arrives passageway face plate, will " gray passageway " delete, if plan institute is shown.
Delete before the passageway
After deleting a passageway
4. Choose " gray scale of → of image → mode " command, picture mode the setting is " gray scale " , if plan institute is shown.

5. Choose " → of image → mode double tonal " command, picture mode the setting is " double tonal " , if plan institute is shown.

6. Open " double tonal option " dialog box, click printing ink the 1 pushbutton on the side, in what open " pick up color implement " color of printing ink of the choice in the dialog box, be like: Black, if plan institute is shown.

7. Click printing ink the pushbutton of 1 double tonal curve on the side, in what open " double tonal option " in the dialog box, procrastinate with the mouse move a curve to adjust printing ink the color value of 1, pushbutton is clicked after the setting is good, if plan institute is shown.
