Fig. 1. A $\mathrm{2}\times \mathrm{2}$ color image and its quantum representation expression of QRMW

Fig. 2. A $\mathrm{2}\times \mathrm{2}$ color image quantum circuit of QRMW

Fig. 3. A compressed $\mathrm{2}\times \mathrm{2}$ color image quantum circuit of QRMW

Fig. 4. (a) Probability histogram of quantum states in QRMW images; (b) $\mathrm{2}\times \mathrm{2}$ color images restored according to the measurement results

Fig. 5. Quantum circuit of (a) $CS{O}_{\mathrm{B}\mathrm{G}}$, (b) $CS{O}_{\mathrm{R}\mathrm{G}}$ and (c) $CS{O}_{\mathrm{R}\mathrm{B}}$operation

Fig. 6. (a) Original image of Lena; (b) Image after swapping $\mathrm{G}$, $\mathrm{B}$ channel; (c) Image after swapping $\mathrm{R}$, $\mathrm{G}$ channel;

Fig. 7. Quantum circuit of (a)$PCS{O}_{ij},$(b) $PCXO$ and (c) $PCX{O}_{ij}$ operation; (d) Original image of Lena; (e) Image after the disarray

Fig. 8. Histogram of (a) Lena's original image and (b) the disarrayed image

Fig. 9. Adjacent pixel correlations in (a) horizontal direction, (b) vertical direction and (c) diagonal direction

Fig. 10. Medical images messed up the results of the experiment. (a) Original medical images; (b) Images after scrambling