The adjustments in Photoshop allow you to edit an image by simply clicking on the option. You can edit the colours, hue and saturation, brightness and contrast, levels, channels, exposure, and black and white.
The colours adjustment can be selected by clicking on it and is used basically for colour correction. It adds a tint to the dark tones, midtones highlights of the image. This is controlled by sliders that are set by default to adjust the midtones. The sliders control the colour correction to each level.
The hue and saturation adjustment clearly allow you to control the hue and saturation of the image. You can adjust all the colours simultaneously or all at the same time by selecting Master on the colour list, you can then go on to adjust them with the three sliders. Saturation adjusts the amount of colour, hue adjusts the actual color and lightness adjusts the amount of black and white in the image.
The brightness and contrast are controlled by sliders, this makes it very easy to alter them to give a good effect. With this adjustment there is an option to tick the Use Legacy box which will adjust the brightness of each pixel, which is not recommended.
With levels there are three sliders that are used to adjust the tonal range of the images colours. One for the dark tones, one for the midtones and one for the highlights. To use the level adjustment, simply click on it and adjust the settings as desired.
The channels adjustment can be used to create high quality, greyscale or tinted images. You can choose the colour that you want to add using the Output Channel, from there you can go on to adjust the sliders to change the amount of colour that you add. If you check the Monochrome box, you can create a greyscale image or add a colour tint to a greyscale preset.
The exposure adjustment allows you to change the exposure, offset and gamma by altering the three sliders. Exposure adjusts the highlights of the image but does not affect the shadows, offset allows you to adjust the midtones and gamma allows you to adjust the dark shadows but it will not affect the hightlights of the image. It is very useful when editing HDR images.
The black and white adjustment allows you to create greyscale images by clicking on the black/white icon. It allows you to control how the colours are converted into black and white, so that you can control the depth of black and white in the image, this is done using sliders, one for each colour. You can select the default mode to create the image for you or you can use one of the presets.
The filters within photoshop allow you to add different effects to your image. There are many to choose from including: artistic which allow you to add effects such as water colour, sponge or smudge. Brush strokes which allow you to add effects such as accented edges or dark strokes which drastically blur the image. Distort allows you to add effects such as glass, which makes the image look like it is behind glass. Sketch allows you to add effects such as graphic pen or charcoal which makes the image look like it has been sketched with charcoal. Stylize adds the effect of glowing edges to the image. Texture adds the effect of tiles or a texture to the image. The intensity of each of the filters can be controlled by sliders which control the size, detail, distortion, direction, stroke balance and smoothness of each effect.
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