1. In a digital medium environment for determining a camera-to-object distance from features within a digital image in a digital image creation system, a system comprising: an image processing application implemented at least partially in hardware of a computing device to obtain the digital image for processing; a feature identifier implemented at least partially in hardware of the computing device to identify a particular feature contained in the digital image, the particular feature corresponding to a defined reference feature having known physical dimensions in real life, to identify the particular feature including determining whether the particular feature lies along an axis of a two-dimensional Cartesian system relative to the digital image; a measurement module implemented at least partially in hardware of the computing device to measure a dimension of the particular feature that reflects a digital size of the particular feature within the digital image, the measurement module further configured to: compute a Pythagorean hypotenuse of a projected right-angled triangle formed by the particular feature to use as the dimension of the particular feature responsive to determining that the particular feature does not lie along the axis; and a camera-to-object distance calculator implemented at least partially in hardware of the computing device to calculate a camera-to-object distance for the digital image based in part upon a ratio of the measured dimension of the particular feature and the known physical dimensions of the identified feature.