Benefits
of the plugin

Edit radial exposure
Edit radial brightness
Even exposure throughout the photo from center to corner
Create radially transparent masks for radial color-correction

The radial density filter plugin works with these image modes (Windows and Mac)...
8,16, 48 & 64 bit: RGB, Grayscale, Duotone, CMYK, Multichannel, Lab.

Radial Density
filter controls

This is the Radial Density plug-ins control panel at one third size. Click on the photo or the links to the right to see the plug-in at full size.

The filter has only three basic sets of controls:

1. radius of the density filtering.
2. radial exposure filters.
3. radial brightness filters.

Example -

The Radial Density plugin is the only one of its kind for correction of uneven radial exposure and brightness caused by a flash or lenses.

What is radial density?

Lenses - especially wide-angle lenses and home digital cameras - do not expose evenly but tend to expose the center more than the edges. "Density" refers to the combined changes in exposure and brightness caused solely by the lens. If you were to photograph a monochrome white surface under uniform light, you would get an image of the radial density distribution of the lens that looked somewhat like this...

The plug-ins filtering controls

Radial adjustment

Here you can set the radius of the spread and also how much the progressive levels should be fused.

Radius %

Diffusion %

Schematic illustrations of the principle of radial diffusion

For the sake of illustration, we have made these drawings. In reality such an edge would only span a single value step, and be much smaller, but they illustrate how diffusion works.

Radial exposure

The rest of the controls are for correcting radial exposure and radial brightness. You can raise or lower exposure - which is quite different from brightening and darkening. Density is the combination of exposure and brightness, so you have two similar sets of sliders - one for each. Each set contains four controls. For exposure they are...
Lower edge
Raise edge
Lower center
Raise center

Radial brightness

The radial brightness controls are similar to the exposure controls with one important exception: if you are working with layers in RGB image mode, then you can create radial transparency for exact correction layers. If you mark the "Use transparency" box, then the two Darken sliders control transparency.

Radial transparency

If you select Use transparency, then the two brightness controls for darkening will control transparency. This way you can create very exact correction layers.
This means that if your radial exposure correction reveals a radial discoloration, then you can create a correction layer with our plugin that has exactly the same spread acceleration as the revealed discoloration.

Retouch levels

As with most other Powerretouche filters you can restrict the retouching to lights, midtones and darks.

White Alert and Black Alert will apply their respective colors to areas in the preview, that are pure white or pure black. You can change the color by clicking in the colored rectangle.

Examples

Outdoors scene shot with a wide-angle

Indoors scene shot with a flash

This was corrected with Corners at 100%.

It is a case of combined uneven radial exposure and brightness - which is typical of flash-photography.
Notice the pressing and stuffed mood created by dark corners and edges is gone in the filtered version.