Optimizing photos taken in difficult mixed light(Adobe Photoshop CS-CS4)

              Photos are not only insidious in interiors, but also in landscape shots. Photo sensors fi ght with the high dynamic range and also with the color temperature coordination due to diff erent light sources.
              Often, this problem cannot be solved by processing a single image version. You can however develop two versions using image processing, which reproduce certain image areas optimally and combine these into one image.
DEVELOPING TWO VERSIONS: Coordinate color temperature for the different light sources with the RAW module and adjust exposure to the important image area. Then save the versions separately as TIF or JPEG.
STACKING IMAGES: Open the two versions and push one image onto the other using the mouse. Select both images in the layer pallet and click ‘Edit | Align layers automatically’ (from Photoshop CS3 onwards). In older versions, superimpose the images using the arrow keys.
MASKING AREAS: Select the upper layer and lay a mask over it by clicking the circle symbol. Activate the brush in black and set a large diameter with feather. Use it to paint over areas, which should not be there in the final image. The corrected colors will become visible.
FINISHING AT THE EDGES: You must proceed cautiously at hard edges, e.g. the bridge in the sample image. Reduce the brush size and increase the sharpness. Don’t worry if you have done too much masking at some points. Change the color in the toolbar to white and paint over the relevant areas. This works in both directions. Then combine all layers using ‘Layer | Flatten image’. You can now process the final version further. For instance, adjust the image size and re-sharpen using ‘Filter | Sharpen | Unsharp mask’. Now save the image in the desired format.