PS teaches you to remove the purple edges of digital photos

What are the purple edges of digital photos?

The purple edge of the digital camera refers to the digital camera in the process of capture due to the contrast between the object, the high light and low light parts of the spot at the junction of the phenomenon is the digital camera purple (or other colors). The reason of the purple Edge appears in the camera lens dispersion, the CCD imaging area is too small (the imaging unit density is big), the camera internal signal processing algorithm and so on.

A little doubt:
　
Using Photoshop to remove the purple edge seems too easy, online tutorials, as long as the use of "Image > Adjustment > Hue/saturation" directly adjust the blue channel saturation, value can eliminate purple edge. Yes, that's a quick way to do it, but it's flawed. What is the reason for this, this article describes the advantages of the method is to remove the purple edge does not affect the other normal color area of the photo, and due to the application of the adjustment layer, you can easily repeatedly adjust the layer.

Here is a concrete example method:]


The phenomenon of purple edge in photos taken by digital camera is more remarkable. The purple Edge will cause a purple contour in the Gao Rui area. This article describes how to use the adjustment layer to remove the purple edges.

1. Open the image you want to edit. This tutorial selects a picture with a purple edge. (Figure 01)



Figure 01

2. Copy layer "background". Using the Levels tool (shortcut key ctrl+l), drag the White input slider to the left of the column until most of the purple edges are visible. Click the "OK" button. Use a white brush to spray areas with no purple edges. [Below is the contrast effect before and after this step] (figure 02-1,02-2)




Figure 02-1





Figure 02-2
3. Enlarge the visible area of the purple edge. (Figure 03)



Figure 03

4. Create a new "optional color" adjustment Layer (menu "Layer > New adjustment layer > Optional Color") as the top layer and apply the following properties: (Figure 04)



Figure 04

Color: Red
Black:-100%

Color: Yellow
Black:-50%

Color: Cyan
Black:-100%

Color: Blue
Black: 0%

Click the "OK" button.

5. Create a new hue/saturation adjustment Layer (menu "Layer > New Adjustment layer > Hue/Saturation") and set the blue saturation to "-100" and "yellow saturation" to "-50". Click the "OK" button. (Figure 05)



Figure 05
6. With the hue/Saturation adjustment layer selected, use the Apply Image tool (menu image > Application image) to apply the following properties: (Figure 06)



Figure 06

Masks: Tick
Layers: Layer 1
Channel: Gray

Click the "OK" button.

7. Remove the two layers in the middle, leaving only a layer named "Background" and a "hue/saturation" adjustment layer. The purple side is now removed. [The following is the application of the technique to the original image before and after the contrast effect]



Figure 07-1 before the removal




Figure 07-2 after removal


Create a new adjustment layer with a layer mask, only colors affected by the purple Edge are edited (repaired). Many times you may only use the hue/Saturation tool to set the blue saturation dysentery 100 and the yellow saturation to 50, but this method usually affects other areas of similar color.

[If you want to use only the hue/saturation tool for simple adjustments and want to prevent other similar color areas of your photos from being affected, the easiest way is to use the Lasso tool to select the area you want to adjust, and then apply the hue/saturation adjustment]

Note: The contents of "[]" are added by the translator, or the original text is modified according to the needs of the language.