Thanks to the function Depth in Portrait mode iPhone camera, you can independently adjust the blur effect of the background (background) on photos taken in Portrait mode…
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How to adjust the amount of background blur (Depth function) when shooting portraits on iPhone
1. Open the camera app.
2. Select the mode Portrait…
3. Click the ƒ icon with the value in the upper right corner (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 selected and will use it for subsequent shots.
5. Take a photo.
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How to adjust the amount of background blur on a finished photo on iPhone
To change the degree of background blur on the finished photo in the “Photos” application:
1. Open a picture taken in portrait mode and press the button. “Edit”…
2. Click the ƒ icon with the value in the upper left corner (available on iOS 12.1 and later).
3. A slider will appear at the bottom of the interface for photo editing “Depth”, by moving which, you can change the depth of field of the photo (blur effect of the background).
Photographers working with professional cameras are well aware that the higher the aperture value, the shallower the depth of field and the more blurry the background becomes. Conversely, the smaller the aperture, the deeper the depth of field and the more clearly the background is visible. It is this feature of Apple cameras that has been reproduced using the function “Depth”…
If you are unfamiliar with photography, aperture values can be confusing at first. The fact is that the less the diaphragm is open, the more number it is designated. 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 most blurred background is obtained. With an aperture of ƒ / 16, blur almost disappears and you get a shot with a clear background.
No background blur – ƒ / 16 (minimal background blur)
With Depth effect – ƒ / 4.5 (medium background blur)
With Depth effect – ƒ / 1.4 (maximum blur photo)
The default for pictures taken in Portrait mode on iPhone, the aperture is ƒ / 4.5. If you want to get more or less background blur, use the slider “Depth”… Recall that earlier in portrait mode, the background was blurred automatically, and the blur 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.