How to edit pictures on mac like paint. Use finder to locate the image you want to edit in preview. Drag over part of the background. Remove the background from an image.
The paint style features in preview are most obviously useful for making simple annotations to existing images. Drag the black white slider left and right to activate and adjust the photos black and white intensity. You can also adjust a photos black and white neutrals tone and grain.
Click on border color icon in the toolbar to select red click on shape style to choose a thicker line click on fill color and then click on show colors to bring up the color dialog and change the opacity all the way down to 0 so that rectangle in the next step does not hide the underlying image. In the preview app on your mac if the markup toolbar isnt showing click the show markup toolbar button then click the instant alpha button or use the touch bar. If the image only appears in the photos app right click on the photo select edit with on the pop up menu then click preview.
Click on the edit button in the top navigation panel.