To start markup we should import images at first. Just press the “Import Images” button and select them (use "Shift" + "Command" buttons for multiple selections). You can also drag and drop images to the Images Pane to import them. MakeML converts all images to .png format with max 600x600px dimension. That's because computer vision neural networks for mobile devices usually work on low image resolutions.
Then let’s add annotation title. At this tutorial, we will make a model that detects dogs. Enter “dog” in the “Add Annotation Title” field and select any color. Press button with a plus icon. So, we are ready for the markup.
Just press the left mouse button and drag a mouse to markup a dog. Also, you can change annotation by dragging the top-right or the bottom-left corner of an annotation.
So you are ready for training Neural Network.