The adjustments aren’t there to improve what you already have in Photoshop. In some cases, they can transform your work in the same way that filters can. Three of these adjustments – the Invert, Threshold and Posterize tools – can be combined to create comic-style effects.
The Threshold adjustment consists of one balance slider. It turns colour or greyscale images into high contrast, black and white images, and produces interesting results when used at a low Opacity.
Posterize is similar to the Threshold tool, but offers you as many levels of colours as you wish. When used as a final flourish in an image, it provides a low-fi, comic book-style effect.
The Invert tool inverts every pixel to the opposite colour and shade. It has no other options. When used on a low Opacity, it can provide you with a foggier, non-contrasted image.
At the end of almost any project, you’ll use one of three adjustments: Curves, Gradient Map or Color Lookup. You may even end up using all three, for they each give you tonal and colour editing abilities to either improve or completely change your painting.
Curves works by tweaking the strands in the graph, and as well as altering tone, you can use the drop-down menu to change the colour channels, such as red, green and blue in an RGB image.
The Color Lookup filter gives you a range of preset filters that can change how your photos and artworks can look, ranging from Edgy Amber to Foggy Night, and even some specific camera model effects.
By setting a colour for each shade in your image, the Gradient Map can repaint your image. It’s best used when set to Soft Light for a simple, yet sophisticated filter.
