© Jan Esmann and Power Retouch. All rights reserved.
Photoshop plug-ins for retouching
Exposure

Quick introduction

Exact emulation of exposure stops. Target the exposure correction to certain levels or apply a graduated effect. This is the Exposure plugin’s control panel. Click on the image for a larger view. It works with the following image modes: 8 & 16 bit/channel: RGB, CMYK, Grayscale, Duotone, Lab.

Exposure controls

You will get quite different results if you turn Exposure correction  on or off. Exposure stops  accurately emulates the exposure stops of a camera.
Offset  simply adds a given luminance value to the entire image. This may be usefull if the image is in the dark range. Use it in combination with   Shadow depth , which scales the levels of the image more or less towards black while preserving the lights. Color  is a basic saturation tool, since exposure correction may, at high levels, desaturate or oversaturate some images, so you can adjust it here. Black alert  and   White alert  will show pure black and pure white in the preview as the given colors. You can change the colors by clicking in the rectangles.
Exposure correction +2.33 stops
Original photo
-4.00 stops, color 0
-4.00 stops, color + 80
Original photo

Correcting overexposed and faded photos

This photo is from 1960 and is both faded and overexposed. We had Exposure Correction turned on. As you can see the color sliders comes in very handy, especially when correcting strongly overexposed images like this one.

Retouch levels

These sliders let you decide if you want to apply exposure correction to either of the five levels.

Graduated effect

These controls are common for most of the Power Retouch plug-ins. Using graduated effect will cause the filter to apply it's filtering at full strength in one side of the image and then fade the effect out towards the other side. You can change direction by right clicking the preview. Midpoint will shift the balance between how large an area will be filtered at full strength and how much will have a faded out effect. Contrast will change the accelleration and spread of the fade-out.
In this example we raised exposure and applied a graduated effect towards the bottom, setting midpoint low. This retouch brought light into the underexposed foreground, bringing it forward, without altering the horizon or sky.

Brightness range

These three sliders let you target your exposure compensation to a specific brightness range. From - pixels darker that this will remain unchanged. Up to -pixels lighter than this will remain unchanged. Target - pixels at this brightness value will be changed the most.
Mask unchanged  - checking this will mask all pixels out of range as the selected mask color. Change the color by clicking in the colored rectangle.
Here's an example of a difficult situation We want to raise exposure in the shade but preserve the lights unchanged.
Exposure + 2.00 stops
The mask
Original photo

Color range

These filter controls let you target exposure compensation to a specific range of hues. From - only colors to the right of this slider will be changed. Up to  - only colors to the left of this slider will be changed. This means that depending on if the upper slider is to the left or right of the lower slider, the selected
colors will be those in between or outside the sliders. Softness   - when 0, all selected colors will be equally changed. At higher settings, the effect will fade more and more out. The higher the setting, the wider the fadeout, hence the softness.
Here we wanted to reduce the exposure of the sky and not the hill. We used the ranges to select the blue sky only and lower the exposure of the sky a few steps.
Original photo
The mask
Sky corrected

Histogram and color values

The histogram shows you the histogram for the preview, sop if you want a histogram for the entire image, you have to fit it into the preview. If gaps appear in the histogram,   Anti-posterization  can interpolate the missing values. It does not create noise. Below you have RGB and CMYK value for a given pixel. It shows the value under the cursor if you hold the cursor over the preview. You can also select a point with the eyedropper tool.