Abstract: This paper presents a new method of color digital remote sensing image processing based on irrelevant color space.A new algorithm is also proposed to implement the color space transformation which will reduce color loss.This paper shows an application of the new method to in the field of mosaics assembling technology.True color remote sensing imagery has been applied to more and more areas such as town planning,environment protection and large scale atlas renewal.The improvement is partially attributed to the efficient way of obtaining instrument and the enhanced precision in remote sensing imagery technology.Traditional imagery processing methods can not process three relevant heft heft of red,green and blue.The new method presented in this paper shows an effective way of handling the problem.