Causes of Purple Edge in Photography —— How to Eliminate Purple Edge

Nowadays, many low dispersion lenses and optical designs are added to the lenses to reduce chromatic aberration, so chromatic aberration is not common now. However, the appearance of purple edge is different from the traditional color difference, so today I will talk about the reasons for the formation of purple edge and share the solutions to purple edge!

The reason of purple edge appearance

Many photographers think that poor lens quality will lead to purple edges. But in fact, this statement is only half right. Cameras rely on CCD or CMOS to capture images. Each pixel on it is actually an independent light sensor, and each pixel has a red, green or blue filter. Finally, the data of each unit is mixed into the final image. Because not every pixel unit can detect all colors independently, it needs to be calculated by the image processor to simulate the real image colors. In some cases of high contrast or strong backlight, colored edges may appear in any part of the image. Because purple has the strongest refraction and is often easy to see, it is called "purple edge".

How to eliminate purple edge?

Because the purple border is the product of the digital age, there are of course various solutions in the digital age. Generally speaking, the camera will have a built-in "home formula" to eliminate the color edge problem. As long as the original lens is used to correct the aberrations of various lenses, including "chromatic aberration", it is to eliminate some color edges on the edges with high contrast in the image. Another method is post-elimination. In the software that can handle RAW, such as Lightroom or Camera Raw, there is also a special layout to deal with the color edge problem, which is very convenient.

When most movie friends use digital cameras to shoot Gao Fancha and strong backlight scenes, the edges of the scenes often appear obvious? Purple border phenomenon? It is in this shooting environment that the glistening above has a strong sense of edge? Purple border phenomenon? A poetic work is ruined? Purple edge? Going? If you don't want to give up this work, don't worry, we will teach you to destroy this hateful problem children in Photoshop CS3!

At this time, some people will ask, is it impossible to avoid the purple edge phenomenon with digital cameras? In fact, it can be solved from the following aspects: first, strictly screen cameras and lenses, and you can decide the brand and model to buy through major evaluations and personal experiments to avoid the purple edge phenomenon caused by inadequate production technology; Secondly, under normal circumstances, large aperture, wide-angle end and large zoom factor are prone to purple edge phenomenon, which we can try to avoid. In addition, using multi-point metering instead of single-point metering is also beneficial to avoid excessive light contrast in different parts of the screen; Finally, if you already have a photo with a purple edge, you need the post-adjustment method that we will teach you today, and remove the purple edge!

Photoshop quickly removes purple edges.

Use? Hue/saturation? Command to make the purple edge phenomenon disappear.

Open the photo and analyze it.

Open the photo and analyze it.

Open the photo to be adjusted in Photoshop CS3; Use the magnifying glass tool or? Ctrl+？ Enlarge the most obvious area of purple edge and put it in advance. Straw tool? what's up Sampling size? Become? 3? 3? , in order to proceed to the next step.

Add adjustment layer

Click on the layer panel? Add adjustment and fill layers? Button, select? Hue/saturation? Command, or choice? Layer? Create a new adjustment layer? Hue/saturation? Create a new adjustment layer; Eject? Hue/saturation? Dialog box.

Specifies the adjusted color range.

According to the trend of purple edge color, in? Hue/saturation? In the dialog box? Editor? Select a color from the menu and specify the adjusted color range. Because the purple edge in this picture tends to be blue, we choose blue. ? Straw tool? Is activated as available.

Absorb the color of purple edge and adjust it.

Click? Hue/saturation? The eyedropper tool at the bottom of the dialog box is used to absorb the color of the purple edge as an adjustment sample, and the hue value remains unchanged. By adjusting its saturation (generally reducing saturation) and lightness, the purple edge phenomenon can be eliminated.

Repeated adjustment

If some purple edges are still not eliminated after the above steps, steps 3 and 4 can be repeated; This example is in? Hue/saturation? Dialog box? Editor? Select again in the menu? Blue? Channel adjustment can achieve ideal results.

The final image is adjusted and cropped.

In order to make the overall color of the picture brighter and brighter, change the blending mode of layer 1 to? Soft light? It is good to modify the opacity of the layer; In order to highlight the bees, the picture is cut again, thus completing a transparent honey collection work of bees!

Pay attention to the natural transition in production

What else can we use besides the methods we teach you? Optional colors? Command and? CameraRaw？ Are you online? Lens correction? Command to adjust the purple edge phenomenon.