Setting the Working Colour Space for a Scene
                                                        You can select the working colour space for your scene in the scene settings dialog.
The working colour space is the colour space to which each layer in your scene is converted before all elements in your scene are composited together along with your scene’s effects. Then, the image is converted from your scene’s working colour space to the intended colour space for rendering. Hence, the scene’s working colour space is the intermediary colour space in which the compositing is done internally.
 How to set the working colour space for a scene
How to set the working colour space for a scene
                                                            - 
                                                                        In the top menu, select Scene > Scene Settings. The Scene Settings dialog appears. 
- 
                                                                        Select the Colour Space tab.   
- In the Working Colour Space list, select the desired working colour space for your scene.
- Click OK.