TTNT FILL Alvy Ray Smith COmputer Graphics Lab New York'Institute of Technology Old Westbury, NY 11568 ABSTRACT To fill a connected area of a digital image is to change the color of all and only those pixels in the area. Fill algorithms for areas defined by sharp boundaries (e.g., a white area surrounded by a black curve) have been implemented at several color computer graphics installations. This paper presents an algorithm for the more difficult problem of filling areas with shaded boundaries (e.g., a white area surrounded by a curve consisting of several shades of gray). These images may arise from digitizing photographs or line drawings with a scanning video camera, or they may be generated by programswhich produce antialiased line segments or dekink black-and-white images. When an area in such an image is to be filled with a newcolor, it is desirable to have the fill algorit~n understand the shaded edges and maintain the shading with shades of the new color instead of the old. The tint fill algorithm presented here accomplishes this task. Its nsme arises from its ability to change only the tint (hue and saturation) of a pixel, leaving the value (blackness) unchanged. Although
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