Lesson 18: Basic Editing: Crop, Exposure, and Colour
Editing is where a good photograph becomes a finished one. It is not cheating: every photograph ever made has been processed, whether in a darkroom or in software. The aim of basic editing is simple — to make the photograph look like the scene you remember, or like the image you intended when you pressed the shutter. The three tools that do most of the work are crop, exposure and colour.
Cropping is recomposing after the fact. Straighten a tilted horizon first — a tilted sea looks wrong even to viewers who cannot say why — then remove distractions at the edges and tighten the composition around the subject. Cropping is also how you change the aspect ratio: a wide 16:9 crop suits a landscape, a square crop suits a portrait for social media. But every crop throws away pixels, so it is better to compose well in the camera and crop a little, than to rely on cropping to save a weak composition.
Exposure and Colour
Exposure adjustments correct brightness. If the histogram shows the tones bunched to the left, the image is underexposed; lift the exposure or the shadows. If highlights are clipped to pure white, pull them down. The whites and blacks sliders set the brightest and darkest points, and contrast controls the distance between them. Work gently: a small move is usually enough, and an over-edited image — glowing edges, grey skies turned black — is easy to spot.
Colour adjustments begin with white balance: if the photograph looks too orange or too blue, correct it until whites look white. Saturation increases the intensity of all colours equally and is easy to overdo; vibrance is gentler, boosting muted colours more than already-strong ones. A good rule is to edit until the image looks right, then step back and reduce the strength of your last two adjustments by a little. Restraint is the difference between editing and over-editing.
A Simple Workflow
A reliable order is: straighten and crop, set white balance, correct exposure, adjust contrast, then colour, then sharpening last. Edit on a copy or with non-destructive software so the original is never lost. And edit in a consistent style across a set of photographs — consistency is what makes a group of images look like a body of work rather than a random collection. Software choices matter less than the habit: any capable editor, from a phone app to a professional program, offers these same tools.
Key Terms
- Cropping
- Recomposing a photograph after shooting by trimming its edges.
- Exposure (editing)
- Adjusting the brightness of an image after it has been taken.
- White balance
- Correcting the colour cast of an image so whites look white.
- Saturation
- The intensity of colours in an image.
- Vibrance
- A gentler saturation adjustment that boosts muted colours more than strong ones.
- Histogram
- A graph of the tones in an image, used to judge exposure while editing.
Discussion Questions
- Why should you straighten a horizon before doing anything else in editing?
- What is the difference between saturation and vibrance, and why might vibrance be the safer choice?
- Why is restraint important in editing? What does an over-edited image look like?
Practice Questions
- What is the first step in a basic editing workflow, and why?
Answer: Straighten and crop: a tilted horizon looks wrong, and cropping recomposes the image before other adjustments are made. - How can a histogram tell you an image is underexposed?
Answer: The tones are bunched to the left of the graph, with little or nothing in the bright end. - What does the white balance adjustment correct?
Answer: A colour cast, so that white objects look white instead of orange or blue. - Why is vibrance gentler than saturation?
Answer: It boosts muted colours more than already-strong ones, while saturation increases all colours equally. - Why should sharpening come last in the workflow?
Answer: Sharpening should be applied to the finished image, after cropping and tonal changes, so it is judged on the final result.