The monochrome CCD sensor, on the other hand, actually allows for a more accurate color image in the end by giving the Phoenix team control over each wavelength of light individually. In your digital camera here on Earth, a filter overlay divides the image sensor pixel-by-pixel into receptors for red, green and blue light, which are then combined by the image processor to create a full-color RGB image. Onboard the Phoenix, this same basic concept is done with a 12-position filter wheel that can isolate lights of various wavelengths for capture by the entire sensor. After compositing the single-wavelength captures together back on Earth, a more accurate color representation is possible. The filters can also be used to measure Martian atmospheric conditions by estimating density, water vapor levels and the presence of airborne dust.