Using iPhone APP Catch Questions, you can draw something on your picture.

To utilize the web information like textbook, this function was developed.

You can go to the drawing page from the icon of drawing next to camera button below.

Before drawing on your picture, you have to choose the original picture.

Next you can go to the drawing page.

Here, you can mark the part of picture.

If you would like to change the pen type, select PEN button.

Here, you can mark the part in the clear red.

If you would like to hide the important part, I would recommend you to draw in the dark color.

You can magnify the picture while drawing so that you can draw the smaller part.

After finishing the drawing, tap the SAVE button.

Let’s check the picture at the back page.

Here, you can see the picture with your drawing. If you would like to clear the marked parts, touch the picture with the long press. And again, with the long press, you can call your drawing.

How about this function for your study?