Colorful Diffuse Intrinsic Image Decomposition is an image processing technology that can decompose photos taken in natural settings into albedo, diffuse shadows, and non-diffuse residuals. It achieves estimation of colorful diffuse shadows in images by progressively removing monochromatic lighting and under the Lambertian world assumption, accommodating multiple illuminations and secondary reflections in the scene while modeling specular reflections and visible light sources. This technology is of significant importance for image editing applications, such as removing specular reflections and pixel-level white balance adjustments.