An inverse halftoning algorithm based on wavelet transform for indeterminacy screening parameters and types was proposed for color printing image of different types and parameters in screening. First, the color channels in RGB color space were separated and B-spline wavelet was selected as basis function in wavelet transform. Then, 2 layers wavelet decomposition was carried out on the images and the halftone noise was removed through wavelet threshold denoising strategy. Finally, the inverse halftoning image was obtained after wavelet reconstruction. The experimental results showed that the inverse halftoning algorithm is proper to frequency modulation ( FM) screening and amplitude modulation (AM) screening; meanwhile, it has better visual effect for inverse halftoning image.