Levels are very useful in photoshop as they allow us to remove any part of the image without ruining the original copy and edit the selected part by itself.
A histogram shows us the light throughout the image we have. The horizontal axis represent tone and the vertical axis represents quantity.
A correctly exposed image is when the light in the image is at its best. An underexposed image is when the image is too dark whilst an overexposed image is too light.
I have used the magic wand too select part of my image as it helps select which part of the image i want. I can then edit that seperately using such tools as hue and saturation. To access these tools i go onto Enhance and then select which tool i would like, such as adjust lighting or colour.
A low key image is where the shadows are in most of the photo whereas a high key image is where most of the tones are in the highlights.
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