KEYWORDS: Photography, Human vision and color perception, Cameras, Image segmentation, Eye, Image processing, Visual process modeling, Data modeling, Light sources, Distortion
Portrait artists using oils, acrylics or pastels use a specific but open human vision methodology to create a painterly
portrait of a live sitter. When they must use a photograph as source, artists augment their process, since photographs
have: different focusing - everything is in focus or focused in vertical planes; value clumping - the camera darkens the
shadows and lightens the bright areas; as well as color and perspective distortion. In general, artistic methodology
attempts the following: from the photograph, the painting must 'simplify, compose and leave out what's irrelevant,
emphasizing what's important'. While seemingly a qualitative goal, artists use known techniques such as relying on
source tone over color to indirect into a semantic color temperature model, use brush and tonal "sharpness" to create a
center of interest, lost and found edges to move the viewers gaze through the image towards the center of interest as well
as other techniques to filter and emphasize. Our work attempts to create a knowledge domain of the portrait painter
process and incorporate this knowledge into a multi-space parameterized system that can create an array of NPR
painterly rendering output by analyzing the photographic-based input which informs the semantic knowledge rules.
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