+Levels
=The Levels tool is a more exact version of the brightness and contrast tools that is customizable rather than fixed like the other two. This tool is more complicated than the other two and is primarily used by more experienced Photoshop users.
+Curves
=Curves is a similar tool to Levels in that it selectively stretches or compresses color tones. While the Levels tool only adjusts based on a white point, a black point, and a midpoint, the Curves Tool can use any number of anchor points. This gives the user even more control.
+Exposure
=Yet another more specific tool to adjust the brightness and contrast of artwork by shifting all levels by a constant multiplying factor rather than by shifting certain points.
+Vibrance
=Saturation uniformly adjusts all colors in an image, whereas Vibrance uses a formula to improve muted colors while largely avoiding improvements to already stronger colors.
+Hue/Saturation
=Hue is the base pigment or color. Saturation adjusts the intensity of that color, making either a deep, rich color, or a tint. Brightness determines how light or dark the resulting color will appear.
+Color Balance
=When there is too much of one color or not enough of another, use the color balance tool to adjust color-by-color.
+Black & White
=As the name implies, this tool allows you to turn a color image into a black and white image.
+Photo Filter
=This tool is used to warm up or cool down the overall colors of an image. Photo Filter is like the filters that photographers add to their cameras to add tint.
+Channel Mixer
=This tool allows you to repair bad color channels. It also further allows you to create tinted images and other special effects like producing gray scale images from color.
+Tools Toolbar
=Spot / Healing Brush
-This tool is used to clone one area of an image and seamlessly blend that area with another area of the image. It is often used to remove blemishes or red-eye from photographs.
=Blur / Sharpen / Smudge
-These tools are fairly self-explanatory. The Blur tool blurs the selected area of a photo. The Sharpen tool will make the edges of a selected area stand out. The Smudge Tool is used by pulling a part of an image in one direction, creating a smudging/stretched effect.
=Dodge / Burn / Sponge
-The Dodge tool will lighten colors in a selected area, even to the point of them turning white. This is often used to whiten teeth in photographs. The Burn tool is the opposite of the Dodge tool, darkening colors in a selected area. The more it is used, the closer to black the area will get. The Sponge tool will decrease the color saturation of a selected area of an image. It can be used to make certain parts of an image color and others black and white.
=Brush Tool (Whitening Teeth)
-The brush tool is a basic drawing tool. The diameter option changes the width of the brush. The hardness option changes the opacity of the edges of the brush. You can also blend the color of the brush with the colors behind it.
