You may recall our discussion of your digital camera's 'White Balance' control, in the Camera section of the guide. There we said that while our eyes and brain compensate for the varying colors of ambiant light, the camera dutifully records ambient color unless told to compensate based on the White Balance setting.

When White Balance is set improperly for the picture-taking situation, images will have a color 'cast.' For example, photos taken indoors at night, lit by common light-bulbs will have an overall yellow-brown tint. Fluorescent lighting tend to impose a light-green cast.

Photo-editors do a good job of correcting color, with very little if any cost to image quality. Check the example below.

This image was taken in the open shade of the Sea World performance pool. The day was bright and sunny, but the pool and stage area were very blue. With white balance set to sunlight, the camera recorded all that blue.

Using the photo-editor we can remove the blue cast by adjusting hue, saturation and brightness values of the image.