Color pictures turned into sketches

Quick answer：

Transforming color pictures into sketches is a form of digital art and graphic design. This process often involves the use of software tools that allow artists and designers to convert the original images into black and white or grayscale sketches. Techniques can range from simple color removal to more complex shading and texture模仿. This transformation is popular in graphic design, illustration, and art education, as it allows for the exploration of form and composition without the distraction of color.