Crop your image. See Crop images.
The Grain section of the Effects tab has controls for simulating film grain for a stylistic effect reminiscent of particular film stocks. You can also use the Grain effect to mask enlargement artifacts when making large prints.
Together, the Size and Roughness controls determine the character of the grain. Check grain at varying zoom levels to ensure that the character appears as desired.
Controls the amount of grain applied to the image. Drag to the right to increase the amount. Set to zero to disable grain.
Controls grain particle size. Specifying a value of 25% or higher can cause some image blurring.
Controls the regularity of the grain. Drag to the left to make the grain more uniform; drag to the right to make the grain more uneven.
To apply a vignette to a cropped image for artistic effect, use the Post Crop Vignetting feature.
Applies the postcrop vignette while protecting highlight contrast but can lead to color shifts in darkened areas of an image. Appropriate for images with important highlight areas.
Applies the postcrop vignette while preserving color hues but can lead to loss of detail in bright highlights.
Applies the postcrop vignette by blending original image colors with black or white. Appropriate when a soft effect is desired but can reduce highlight contrast.
Positive values lighten the corners, negative values darken them.
Higher values restrict the adjustment to the area closer to the corners, lower values apply the adjustment to a larger area away from the corners.
Positive values make the effect more circular, negative values make the effect more oval.
Higher values increase the softening between the effect and its surrounding pixels, lower values reduce the softening between the effect and its surrounding pixels.
(Available for a Highlight Priority or Color Priority effect when Amount is a negative value) Controls the degree of highlight “punch” in bright areas of an image, such as in the glow of a streetlight or other bright light source.
Adobe Camera Raw allows you to easily decrease or increase the amount of haze or fog in a photograph. Click in the Adjustment panel on the right to view the Basic panel and adjust the Dehaze slider control.
Controls the amount of haze in a photograph. Drag to the right to remove haze; drag to the left to add haze.
Radial filters in Adobe Camera Raw direct attention to specific portions of the image. To know more, see Radial Filter in Camera Raw.