First, select Insert from the file menu to find the desired picture; After importing the picture, click the embed option; Select the pen tool to draw the interception path on the image; Finally, find and click the cut mask option in the object menu, click the cut mask option, and finally click the create option to complete the matting. The following is a detailed introduction:

1, open AI, click the insert in the file menu, and then find the picture we need in the pop-up dialog box;

2. After importing the picture, click the embed option;

3. Find the pen tool in the toolbox again, and then use the pen tool to draw the interception path on the image;

4. Choose a good picture and path, find the option of cutting the mask in the object menu, click the option of cutting the mask, find the option of creating in the drop-down menu and click it to get the graphics you want.

1, channel deduction principle: channels include: color channel, ALPHA channel and spot color channel. Among them, the ALPHA channel is used to store the selection, and the ALPHA channel uses 8-bit gray scale between black and white to save the selection. Instead, we can use the black-and-white contrast in the ALPHA channel to make the choice we need.

The color scale can be adjusted by adjusting the intensity levels of dark tone, middle tone and high tone of the image to correct the color range and color balance of the image. We can increase the black-and-white contrast of the image through the color scale, so as to determine the selection range.

Open the channel panel. First of all, we choose one of the three channels of red, green and blue, and copy this channel with obvious color pairs. Here I choose the blue channel.

2. Click Image → Adjust → Level, that is, move the small black triangle to the right to adjust the dark tone level, and then move the small white triangle to the left to adjust the bright tone level, thus separating the colors of people and backgrounds in the image. You can also enter the color scale above:135/1.00/195.

3. The outline of the character has been basically separated from the background, and then we use the brush tool to smear the white inside the character into black.

4. Click on the image → Adjust → Reverse to turn the character part into white, that is, select area 5. Click "Load channel as selection" under the channel panel, then return to the layer panel and select the background layer 6. The choice has been made. Then use the cut and paste command to select characters and dig them out completely.