In an earlier article we introduced you to the concept and interface of RawTherapee. RawTherapee is a powerful yet free RAW editing program that is available for MacOS Windows and Linux. Being a free, open source program it has some idiosyncrasies but that should not detract from how powerful a tool it is. Today we are going to look at some of the basic editing tools to get you going. These will be Exposure, Shadow and Highlights and White Balance. The main tools to get you started with editing an image.
Exposure Tools
To quickly get to the Image Editor, double-click any image in the file browser. You will see on the left side of the screen that you have now entered the Editor tab and on the right will be an overly complex looking set of tools. Don’t worry too much about their complexity, the majority work in much the same way of those in Photoshop, Lightroom or any other image editing software.
The main exposure tool are top right of the editor window.
The top section of the editing tools is Exposure. Like other apps, you can show where there are compressed highlight and crushed shadows To do this, go to the two warning triangles top right of the actual image and set them on. Blown highlights will be shown in black, shadows in white. You also have the highly useful histogram to the top left of the screen.
The clipping indicators at the top right of the image window
The Exposure compensation slider simply raises or lowers the overall density of the image. Sliding to the right will increase exposure, to the left reduce it. Moving to the slider right to 1.00 is the equivalent of adding one stop of exposure.
Exposure compensation increase or decreases exposure by EV values.
The Highlight Compression slider is similar to Highlights in Photoshop or Lightroom. It will raise or lower the density of the highlight areas, allowing you to pull back clipped whites. The Highlight Compression Threshold tool basically regulates the strength of the Highlight Compression slider.
Black is used to change the density of the darkest parts of the image. Sliding it right will make the blacks darker, sliding left will make them become more grey.
Pushing the Blacks slider too far will clip the shadows
Shadow Compression tempers the effect of the Black tool and is used to lighten or darken the shadow regions of the image.
Lightness works in a similar way to Exposure Compensation in that is lightens or darkens the image. However, it keeps both the pure black and pure white points fixed so only changes exposure in the tonal regions of the image.
Contrast will push the darker regions out towards the left edge of the histogram and lighter areas towards the right edge of the histogram, posting overall contrast. Like with other editing apps you will get more control over contrast using the Highlight Compression, Black and Shadow Compression tools.
Shadows/Highlights Tool
Strangely to use the Shadow/Highlight tool you have to switch it on. That is done by clicking the on switch top left of the tool. Unlike the general Exposure tools, the Shadow/Highlight tools work only in their specific tonal ranges.
Sliding Highlights to the right will reduce exposure in the brightest parts of the image without affecting the dark areas. The Shadows slider does the same for the dark areas of the image. The Tonal Width sliders define how aggressive the Shadow or Highlight tool is working on an area.
Local Contrast boost contrast slightly across the whole image without moving the black and white points out to the edge of the histogram.
Shadow/Highlight adjustment should be done carefully to avoid halos
White Balance
To get to the color tools you need to click the third icon from the left at the top of the Editor Tools. We will deal with just the White Balance tools in this article, the others we will look at in some more advanced tutorials.
Temperature is used to change the color temperature of an image. It works best on RAW files where a temperature has not been embedded into the image. It works on the usual degrees Kelvin scale. Sliding left to the lower numbers will make an image more blue. This is because it is compensating for warm light such as tungsten. Sliding to the right will add warmth to the image compensating for colder light such as overcast and flash.
Temperature uses the Kelvin scale
Tint allows to fine control the green/magenta tint of the color balance whilst the Blue/Red equalizer changes the effective strength of the Temperature tool.
This tutorial has concentrated on getting some basic edits into an image using RawTherapee. For the next article, we will look at how to sharpen, resize and export an image. After that, we will take a look at some of RawTherapee’s more advanced functions.
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