2) An under exposed image is very dark because less light has been let onto the film, a correctly exposed image is 'normal' and has had the right amount of light allowed onto the film, An over exposed image is very light as it has had too much light let onto the film.
3) If an image is high key it means it has predominantly light tones however if its a low key image it means it has predominantly dark tones.
4) Levels let you adjust colours and the contrast of a photo so you make a photo brighter or darker so it doesn't matter if the original exposure of a photo isn't perfect because you can change that.
5) The selection tools let you concentrate on a certain area of a photo which means you can edit that particular section in any way you like it whether its by changing the contrast or smudging it with the distortion tools.
6) Channeling means you can take an image and mask a certain part you dislike by altering the colour of the section you want to mask. Its very easy to use and for best results it should be used on a black and white photo or night time shot of a horizon with dark sky.
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