10. At least one computing device operative in a digital medium environment to enhance picture vectorization by facilitating conversion of raster images to vector images based on spatially-localized user control, the computing device comprising: a segmentation module configured to segment a raster image into multiple segments, the raster image including multiple image features and corresponding to a picture having multiple semantic elements, each segment of the multiple segments based on at least one image feature of the multiple image features, the multiple image features of the raster image serving as a proxy for the multiple semantic elements of the picture; a localized user control module configured to: present a user interface feature to provide localized control of a vectorization of the picture, the localized control pertaining to a portion of the raster image; and detect a user control signal indicative of the portion of the raster image for which a localized vectorization characteristic is to be adjusted; and a vector image production module configured to produce a vector image corresponding to at least part of the picture based on the multiple segments and an adjusted localized vectorization characteristic.
10. At least one computing device operative in a digital medium environment to enhance picture vectorization by facilitating conversion of raster images to vector images based on spatially-localized user control, the computing device comprising: a segmentation module configured to segment a raster image into multiple segments, the raster image including multiple image features and corresponding to a picture having multiple semantic elements, each segment of the multiple segments based on at least one image feature of the multiple image features, the multiple image features of the raster image serving as a proxy for the multiple semantic elements of the picture; a localized user control module configured to: present a user interface feature to provide localized control of a vectorization of the picture, the localized control pertaining to a portion of the raster image; and detect a user control signal indicative of the portion of the raster image for which a localized vectorization characteristic is to be adjusted; and a vector image production module configured to produce a vector image corresponding to at least part of the picture based on the multiple segments and an adjusted localized vectorization characteristic. 14. The computing device as described in claim 10 , wherein the localized user control module is configured to merge segments or to split a segment based on the indicated portion of the raster image and an intensity of an edge in a contour map corresponding to the picture of the raster image.