In this paper, the spectral transmittances of different solutions of different dyes in water are reconstructed by their colorimetric data measured by scanner. Different solutions were prepared and their RGB data were measured by scanner. Then, by using principle component analysis technique, the eigenvectors and eigenvalues of different sets of solutions were calculated, using RGB data and a linear modeling. Finally, the transmission behavior of each solution is predicted by using the basis function and the RGB values of desired solution. Although the results depend on the sampling technique, but very successful reconstructions are observed, totally.