An under-exposed image is an image that does not have enough light, on the histogram this would be shown as a lot on the left and none on the right (as shown above).An over-exposed image is an image that has too much light, this would look like the opposite of the above histogram.
A correctly exposed image has a well spread distribution of light so will have peaks at both ends of the histogram and should have a larger peak near the grey area of the histogram.
A high key image is on that has predominantly light tones, whereas a low key image will be predominantly dark tones which will make the same picture look very different with each of these different effects added to it.
There are many different ways of selecting things using different tools and all are useful for different things:
- Magic wand - this is used to select a whole area of the same colour within a certain constraint limit which can be set to be more accurate or more indescrete when it selects colours.
- Magnetic laso - this will stick to the edge of the colour that you move it passed which makes it very good for going around the edge of very defined areas that have lots of different colours in them.
- Selection brush - this allows you to manually brush the area you wish to select which makes it easier to select small detailed areas that may have lots of different colours in a small area that the other selection tool may not allow you to get, or would select without you wanting them to.
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