16. In a digital medium environment to determine which fonts are similar to rendered text in an image, a system comprising one or more computing devices including a processing system and memory having instructions stored thereon that are executable by the processing system to perform operations comprising: selecting training images using font metadata associated with respective said fonts used to render text included in respective said training images, the selected training images including: an anchor image having text using a font type; a positive image having: text that is different than the text of the anchor image; or text having one or more applied perturbations; and a negative image having text that is not in the font type; controlling training of the model using machine learning using the anchor image, the positive image, and the negative image; determining similarity of a font used for the rendered text in the image to respective ones of a plurality of fonts using the model; and outputting one or more fonts that are similar to the rendered text in the image in a user interface based on the determining.
16. In a digital medium environment to determine which fonts are similar to rendered text in an image, a system comprising one or more computing devices including a processing system and memory having instructions stored thereon that are executable by the processing system to perform operations comprising: selecting training images using font metadata associated with respective said fonts used to render text included in respective said training images, the selected training images including: an anchor image having text using a font type; a positive image having: text that is different than the text of the anchor image; or text having one or more applied perturbations; and a negative image having text that is not in the font type; controlling training of the model using machine learning using the anchor image, the positive image, and the negative image; determining similarity of a font used for the rendered text in the image to respective ones of a plurality of fonts using the model; and outputting one or more fonts that are similar to the rendered text in the image in a user interface based on the determining. 19. The system as described in claim 16 , wherein the text in the positive image that is different from the text in the anchor image has a font type that matches the font type used for the text in the anchor image.