The unsharp mask tool allows the image to become a lot more detailed, thus making it sharper for the eye. It also makes outlines of a subject more obvious and can give the image a more cartoon-like feel. However, I did have to be careful with this tool because it's easy to over-sharpen, and if this does happen, it is obvious and can easily ruin an image.
The desaturation of an image takes the colour out of an image. Hue/saturation is generally known as a "master" channel because when adjusted, reduces the presence of all colours including green, blue and red. Without this tool, it would be very easy to have too much on a certain colour in an image which can be off-putting. By simply using the hue/saturation slider, the image will either become more colourful, or less colourful which is more or less the actual function of the tool. The effect can basically make the image more aesthetically pleasing.
With vignetting, the border of a subject is darkened, but the strength of the darkness can depend on the user.
By darkening the edges, our eyes can be easily drawn to the main subject in the image and can create connotations such as walls closing in on the subject, or the subject feeling trapped in something. The user needs to be discreet with the tool, otherwise the dark edges can become discrete from the rest of the image.
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