Hints Tips and Recommendations:
Editing or Post-Processing

Before You Start

a) Shoot in RAW image format  if your camera has that facility. This makes editing easier and more powerful. Producing JPEG compressed files with your camera can create unfixable problems, especially in more challenging photographic situations.  Even some phones can save in RAW format.

b) Calibrate your display if you use a Windows computer. See our Screen Calibration and Colour Space page.

 

Laptop Calibration 62 % sRGB
The most saturated or vivid sRGB colours are disappointingly not viewable on the club laptop. The red triangle represents the laptop performance against sRGB (green)

Essential Editing For Beginners


 

Cropping

The most obvious feature to learn in any image editing software is  how to crop.  The crop function (or tool)  is often accessed by pressing the letter C on the keyboard in programs designed for English speakers. 

Images from Jack Quick, a new member who has just begun to edit pictures, show the value of cropping, something that is often done in bird photography.

The other basic aspect of cropping is learning how to rotate a crop.


Understanding the Histogram

 You will almost inevitably make mistakes when editing if you ignore the image histogram display, which is a crucial part of all good image editing programs.  The free Google Snapseed for  Android and iOS even has a histogram display (see our phone apps page).

The simple image histogram “acts as a graphical representation of the tonal distribution in a digital image

You should use the histogram display on your camera as well as in software.
The histogram of a RAW image before and after very basic and fast editing

 The ‘Basic’ Editing Sliders 

The ‘Basic’ Editing Sliders fall Into four categories, Colour Balance, Brightness and Contrast, Local Contrast, and Colour Vividness (or Saturation). [Saturation is the “colourfulness of an area judged in proportion to its brightness”]

The basic editing sliders in Adobe Camera Raw

 An Example of Using the Crop Tool and ‘ Basic’ Sliders to Edit a RAW Format Image Captured with a Pocket Camera

The two images above show what can be done by using basic image editing sliders and the crop tool. In this example the exposure used with a small pocket camera preserved details in the highlight details when a RAW image file was captured.

Another Example of Editing a RAW Format Image Captured with a Small Pocket Camera


Another Way to Change Contrast and Brightness

Use ‘curves’ in either Lightroom, Camera Raw, Photoshop, or many other image editors, to change the black point, white point, contrast and overall brightness.

If you use each of the Red, Green and Blue channels curves independently various colour effects can  be created. Find a  good instructional video  or read the Adobe Curves overview if you are struggling to use or understand curves.


Increasing Sharpness and Reducing Noise in Areas of Low Contrast Variation

When capturing in RAW file format the images are not been sharpened so some sharpening should be applied. Any noise present that will have been especially in dark areas will be exaggerated by sharpening and so should be reduced. Keep noise reduction sliders as low as possible.

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In the Adobe RAW Converter press the ALT key while dragging the masking slider. Sharpness will not be applied to areas in black that lack small details. Sharpening of areas that lack detail is pointless, because there is nothing to sharpen and also makes image noise more obvious.

 


Correct Geometric Distortions Produced by Tilting Your Camera Up or Down

When you tilt you camera up to photograph a tall tree or a building parallel lines converge to a vanishing point. If  is very  easy to correct this kind of  distortion using the sliders that geometrically transform the image.

In this example tall trees where photographed with a phone camera that was tilted vertically upwards. As you can see the tilt has made the trees looking like they are falling backwords.
Leave plenty of space around the feature of interest or you will loose parts of the image when the distortion is corrected by transformation.
After the initial geometric corrections grass and fallen leaves were ‘cloned’ into the corners of the images using the clone tool in Photoshop.

 

Tips and most images by:  Steve Campbell

Next: Editing Parts of Images >