2. In the pop-up page, we click and select "New Canvas", and then choose to use "Red Canvas" or "Blue Canvas" as the option setting, according to one inch: 4 13*295? Or two inches: 626*4 13 pixels to set the canvas, and then click to save the red (blue) canvas picture.
3. Then open a new picture, select the prepared picture, and click Open for the next step.
4. In the function options on the left side of the software pop-up, click "matting pen" to enter the picture matting mode, and use "automatic matting" mode. In auto-matting mode, you only need to draw a stroke within the range of the picture to be matting, and the software will automatically matting according to the shape of the picture.
5. Click Change Background in the lower left corner to adjust the picture to a picture with a red or blue background, and then save it. OK, the red or blue background of the 1 inch photo is finished.