Removing Chromatic Aberration

Color variations occur when the camera records incorrect colors within the photo.
There are various reasons for this, but I’m not going to discuss the solution to eliminate it.

 

Select “Adjust” in the menu bar and click “Chromatic Aberration removal” in the drop-down menu.
The dialog, “Chromatic Aberration removal” appears.

The first thing we have to do is “Zoom in” on the picture available in the dialog (1).
This control is located under the “Before” and “After” boxes.
Click the “Pan” option and pan the image to set a viewable image area in the “Before” panel (2).
In the “Before” pane, drag to define the area needing correction.We call this a “Sample Box” (3).
You can sample up to ten sample boxes.
Each sample listing is displayed in the “List of samples” (4).
Each sample listing has a color swatch to the left, indicating an average color for the sampled area. (5).
If you have added multiple sample frames, select a sample in the “List of samples” section.

Type or set a value in the “Radius” control to determine the size of the samples aberration(8).Type or set a value in the “Range” control to determine the color range of the active sample, which affects the pixel range to be corrected (6).
The range that you provide will be indicated in the color box directly above the element range (7).

 

When you check the “Show differences” box, you can see the parts in the picture that are adjusted.
When you check the “Result on new layer” box, the new picture with the adjustments, will be displayed in a new layer.

Click the “OK” button when you are satisfied.

 

Noise removal

We have two quick ways to remove the unwanted pixels from a picture.

They are “One Step Noise Removal” and “Digital Camera Noise Removal.”
The first option will automatically correct the grainy nature of the picture.
I will discuss the second option here.

First we have to open the photo.
We click the “Adjust” button in the menu bar and select “Digital Camera Noise Removal” in the drop-down menu.

This opens a dialog box.
Three “Cross-hairs” appear in the preview under the “Remove Noise” tab.
These represent samples of “cross hairs” of the lightest areas, mid-tone areas and shadow areas of the image.
You can move the “selection frame” in “Before” pane and it moves the “Cross hairs” in the “Sampling area”.

The check box “Link detail Sizes” determines how much correction should be applied to small, medium and large coarse of patterns.

Enter a value in the “Correction Blend” box to determine to what degree the corrected image will be blended in with the original.

Enter a value in the “Sharpen” box to determine the degree of sharpening if any, that is to be applied to the image after the noise reduction is applied.

You can have up to ten sampling areas.

Click the “OK” button when you finish selecting the settings.

 

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