This is an example of the curves adjustment in photoshop. It affects the two primary influences of colour, tone and contrast. This tool allows you to select a tone and either stretch it or compress it. It uses a number of anchor point to control the changes.
This is an example of the hue/saturation adjustment in photoshop. It lets you adjust the colour intensity of the image. You can individually change the colours using the level controllers or you can adjust them all together.
This is an example of the liquefy tool in photoshop. This allows you to manipulate and distort the image. Photographers use this tool to make their photographs to look better. They use it to make their models look thinner or to accentuate their features. It helps you to make subtle or drastic changes to the image. You can push, pull, rotate, reflect and bloat an area of the image. It is very powerful and can also be used for retouching.
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