To design a robust blind watermarking scheme that is suitable for print-and-scan color image, a dual-transform domain watermarking algorithm was put forward based on discrete wavelet transform (DWT) and quaternion discrete Fourier transform (QDFT). Digital hologram watermarking information was scattered and imbedded into the low-frequency part of three color components of the color host image without visible distortion. Meanwhile the algorithm was blindly extracted. Experiment results showed that the proposed algorithm met the invisibility requirements and was resistant to printing-and-scanning attack. The dual-transform domain watermarking algorithm based on discrete wavelet transform and quaternion discrete Fourier transform retains the advantages of two transform domains in processing of color image, and has better performance in the field of print-and-scanning color image.