Popularity of water mist is increasing for a variety of applications within the broad areas of fire suppression and surface cooling. The present study has been focused on characterizing the water-mist spray for a nozzle and interaction of two nozzles in a 5 cm distance to each other. Full-cone nozzle were operated at medium operative pressure of 6, 10 and 15 bars with expected volume mean diameter of 110 μm. The aim of these works is to investigate a quantitative description of density profile for a nozzle and interaction of two nozzle employing optical techniques by image processing technique. The main characteristics of the mist spray was defined by using the gray level in certain areas. The measurement indicates that higher throw length can be achieved at higher pressure. In the case of two nozzle interaction, the uniform density profile was identified at shorter distance from the nozzle tip at higher water pressure, and the technique for capturing density profile two nozzle interaction was validated with mass flux measurement. A simple measurement technique has been developed in this on going work.