Thanks to the function Depth in Portrait Mode camera on your iPhone, you can adjust the blur effect of the background (background) on photos taken in portrait mode.
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How to adjust the degree of background blur (Depth function) when taking portraits on iPhone
1. Open the camera app.
2. Select a mode Portrait.
3. Click on the ƒ icon with a value in the upper right corner (feature available on iOS 12.1 and later).
4. Set the desired level of “blur” (background blur) using the slider “Depth”located at the bottom of the screen.
The camera will automatically remember the aperture value you choose and use it for subsequent shots.
5. Take a photo.
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How to Adjust Background Blur in Your iPhone Photo
To change the degree of background blur in a finished photo in the Photos app:
1. Open a photo taken in portrait mode and press the button “Edit”.
2. Tap the ƒ icon with a value in the upper left corner (feature available on iOS 12.1 and later).
3. A slider will appear at the bottom of the photo editing interface “Depth”, by moving which you can change the depth of field of the photo (background blur effect).
Photographers working with professional cameras are well aware that the larger the aperture value, the shallower the depth of field and the more blurred the background will be. Conversely, the smaller the aperture, the greater the depth of field and the more clearly the background is visible. It was this feature of Apple cameras that was reproduced using the function “Depth”.
If you are not familiar with photography, aperture values can be confusing at first. The fact is that the smaller the aperture is open, the larger the number it is indicated. By moving the slider “Depth” left or right, you can change the aperture value from ƒ/1.4 to ƒ/16.
As you already understood, ƒ / 1.4 is the maximum aperture value at which the background is most blurred. With an aperture of ƒ/16, the blur almost completely disappears, and you get a shot with a distinct background.
No background blur – ƒ/16 (minimum background blur)
With Depth effect – ƒ/4.5 (medium background blur)
With Depth effect – ƒ / 1.4 (maximum photo blur)
The default for pictures taken in portrait mode on iPhone, the aperture is ƒ/4.5. If you want more or less background blur, use the slider “Depth”. Recall that earlier in portrait mode the background was blurred automatically, and blurring often captured unnecessary details (for example, hair).
Function “Depth” only works with photos taken in portrait mode, because in order to adjust the blur effect, this blur must already be present in the picture.