As a photographer, you work with light to produce quality pictures. The color, direction, quantity, and quality of the light you use determines how your subjects appear. In the studio, with artificial light sources, you can precisely control these four effects; however, most of the pictures you make are taken outdoors.
In photography available light or ambient light refers to any source of light that is not explicitly supplied by the photographer for the purpose of taking photos. The term usually refers to sources of light that are already available naturally e.g. the sun, moon, lightning or artificial light already being used e.g. to light a room. It generally excludes flashes, although arguably flash lighting provided by other photographers shooting simultaneously in the same space could be considered available light.
I have always maintained that anyone who is serious about photography and would like to share his/her work must have his/her workflow tuned to the proper standard at every stage of his/her workflow. The philosphy is simple – from the minute you click the shutter till the time you share the image with the community the image must look almost the same at every stage of the digital photography workflow. There should not be any significant changes in contrast, colour shifts or loss of highlight or shadow details. This obviously applies to those viewing your shared images through their respective monitors too. Otherwise any technical comments on the image will not be valid.
It is imperative that you set the color setting right even before you start using Photoshop. Photoshop’s default color space is sRGB which is the correct color space for Web posting. However sRGB is really a very limited color space, much smaller than what printers can actually produce. I strongly suggest you to change this to Adobe RGB (1998). You do this by going to Edit> Color Settings.