1. A computer-implemented method comprising computer-implemented operations for: obtaining an image of a chart having one or more graphical elements; analyzing the image of the chart to identify an arrangement of the one or more graphical elements and a size of an individual graphical element of the one or more graphical elements; determining a value for the individual graphical element based on the size of the individual graphical element, wherein analyzing the image to identify the size comprises measuring the individual graphical element to obtain the size, wherein the value is based on at least one relative proportion of the individual graphical element with respect to at least one other individual graphical element; determining a chart type based on the arrangement of the one or more graphical elements; and generating an editable graphical chart based on the chart type and the value for the individual graphical element.