What is the reason for the edge problem when extracting and appending colors in an image?

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The edge problem in color extraction and appending occurs when the algorithm used to extract the colors does not take into account the edges of the image. This can result in colors being improperly extracted or appended at the edges, leading to distorted or inaccurate representations of the image. The edge problem is compounded by the fact that edges typically contain a variety of colors and textures, making them difficult to accurately sample and analyze.