There are many ways to whiten, and these Baidu searches all have tutorials. The following is the simplest and quickest whitening operation:

Open the picture, enter the channel, select the red channel, hold down ctrl and click the thumbnail of the red channel to become the selection, return to the layers panel, create a new layer, fill it with white, then reduce the transparency a little, then add layer mask, and wipe the part outside the skin with a black brush. In addition, reduce the opacity of the brush to erase the lips and make the red lips slightly more obvious.

Photoshop needs matting instead of background. After matting, directly put the required background into PS, and adjust the order of layers under matting.

The steps of using PhotoShop to replace the background color are demonstrated as follows:

1, put ordinary photos in PS software, and dig out the flowers in the photos with magic wand/pen/channel;

2.Ctrl+J copies the contents of the selection, and turns off the display of the background layer to get the cut flowers;

3. Set the required color as the foreground color, and fill the foreground color in the background layer;

4. If you want to use a picture as the background, you can put a picture and adjust the order of layers;

5. "File-Save As" png format picture, complete.