The Post Processing Panel allows you edit all the settings for all screen effects to ensure the last result that appears on screen looks as awesome as possible!

Color Correction
Contrast	Set the strength of contrast in the final result.
Brightness	Set the strength of brightness in the final result
Hue	Shift the color pallet of the final result along the color spectrum
Saturation	Set the strength of color vibrance of the final result
Luminosity	Set the strength of the luminosity of the final result

Gamma / Tone-mapping
Gamma	Strength of the gamma correction for rendering
Exposure	Strength of the camera exposure
White Linear	Strength of the white Linear
Shoulder Strength	Strength of the shoulder curve
Linear Strength	Strength of the central portion of the curve
Linear Angle	Angle of the central portion of the curve
Toe Strength	Strength of the toe curve
Toe Numerator	Set the Numerator of the toe angle
Toe Denominator	Set the Denominator of the toe angle

Sharpen
Intensity	Set the Intensity of the sharpen effect

Chromatic Aberration
Focal Point X	Set the X location of the focal point on the screen normalized between 0.0 (left), 1.0 (right), 0.5 (center)
Focal Point Y	Set the Y location of the focal point on the screen normalized between 0.0 (bottom), 1.0 (top), 0.5 (center)
Depth	Set the Z location of the focal point in the scene normalized between 0.0 (closest) and 1.0 (farthest). In simple terms this is the distance after which the effect will occur.
Maximum Depth	Set the maximum depth into the scene used for chromatic aberration calculations (this is the corresponding Depth value of 1.0). Be aware that the greater the value the less accurate the Z focal point location.
Red Offset	Set the offset of red fragment values. The direction of the offset is defined by the angle between the fragment and the focal point.
Green Offset	Set the offset of green fragment values. The direction of the offset is defined by the angle between the fragment and the focal point.
Blue Offset	Set the offset of blue fragment values. The direction of the offset is defined by the angle between the fragment and the focal point.

Screen-Space Ambient Occlusion
Strength	Strength of SSAO
Kernel Size	Sets the Kernel Size of the AO calculation. The greater the size, the more accurate the effect however this comes at the cost of performance. Generally, a value between 32 and 64 is reasonable.
Blur Radius	The radius of the SSAO blur
Bias	Clipping bias for the SSAO

Bloom
Blur Formula	The method to be used for bloom blurring: Gaussian: Standard Omni-directional Blur. Horizontal: Blurs in horizontal direction only. Vertical: Blurs in vertical direction only. Hologram: Blurs into grid shaped blur (requires even number, Blur Size) Star Flare: Blurs into star shaped form. Kernel (Fast): A lower quality faster version of the Gaussian blur method. Different Blur Methods, react differently to Bloom Strength so ensure you check that value when deciding on a method.
Blur Size	Size of the Blur, be aware that a larger Blur size can reduce performance.
Bloom Strength	Strength of the Bloom Effect between 0 and 1.0. For physically accurate results, a low bloom strength of around 0.2 is ideal.
Bloom Threshold	The minimum brightness threshold for a surface before it is affected by the Bloom effect. For physically accurate results, use a value close to 1.0
Fade Threshold	Sets the percentage value to which the threshold can be overridden. This creates more gradual falloff effect for the bloom effect, giving a more realistic result.

Depth of Field
Method	Select the Depth of Field method to use:
Focal Point X	Set the X location of the focal point on the screen normalized between 0.0 (left), 1.0 (right), 0.5 (center)
Focal Point Y	Set the Y location of the focal point on the screen normalized between 0.0 (bottom), 1.0 (top), 0.5 (center)
Near Depth	Planar Method: Set the minimum depth in which objects will be in focus. Any object placed closer than this depth will be out of focus.
Far Depth	Polar Method: Set the Z location of the focal point in the scene normalized between 0.0 (closest) and 1.0 (farthest). In simple terms this is  the distance after which the effect will occur. Planar Method: Set the maximum depth in which objects will be in focus. Any object beyond this depth will be out of focus.
Maximum Depth	Set the maximum depth into the scene used for depth of field calculations (this is the corresponding Depth value of 1.0). Be aware that the greater the value the less accurate the Z focal point location.
Radius	Set the radius of the focal point in the XY plane
Semi-Major Axis	Set the Semi-Major Axis of the ellipse focal point in the YZ plane
Transition Length	Set the distance over which the blur gradually fades into the focal point instead of clipping between blurred and un-blurred, however if you do want to have this clipping effect then simply set this value to 0.0
Blur Strength	Set the strength of the blur
Show Focal Region	Turns on a visual overlay in the viewport to clearly show where the depth of field effect is taking place.

FXAA
Threshold	The minimum contrast threshold for the FXAA shader to detect an edge. The lower the value the easier it is for the shader to find edges however can result in a more blurry end result.
Multiple Reduction	Sets the multiple reduction factor
Minimum Reduction	Set the minimum reduction factor
Max Span	Set the maximum spanning factor
Show Edges	Visualizes the edges where FXAA is taking place. This feature becomes useful when finding the sweet spot value for FXAA

Vignette
Inner Radius	The Inner radius of the vignette which allows for a smooth transition between the outer radius and the scene
Outer Radius	The Outer radius of the vignette. The outer value must always be greater than the inner value
Intensity	The strength of the vignette effect

Grayscale
Intensity	The Strength of the grayscale. A high intensity will make the scene appear brighter. A value of around 1.0 should be used for physically accurate results.