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- Feb 7, 2016
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(Copied from fb)
P4P+ doesn't seem to be the 20mp camera as claimed.
I must say that it has been disappointing to find that my new P4P+ "20mp camera" is an interpolated image from approximately just a 14mp area of the sensor.
Looking at my 2:3 format RAW images, while bypassing the DJI lens correction profile, I see the "full" image as captured by the 2:3 format sensor.
Sadly, this shows that the lens used for this camera, fails to provide and image circle large enough to cover the entire sensor and this results in black corners and image quality loss towards those corners.
DJI's lens correction profile (that is applied to JPGs in camera & automatically to RAW images in some converters) makes distortion corrections and crops a smaller portion of the image to be rid of the dodgy corners. This cropped image is approx 4829 x 2948 pixels.... far less than the claimed 5472 x 3648 in the specifications.
This lower resolution image in then interpolated (enlarged) back to the claimed 20mp size. This is done both to the JPGs and also to the RAW images in those converters that automatically apply the profile.
I'm sorry DJI, but that IS NOT the same as providing the user with an effective (and of course "usable") 20mp of image data to work with.
Please understand that I have not set my expectations too high for a "consumer grade" camera on a drone. I understand that it will never match the quality of a DSLR or similar mirrorless, but I do expect to get the use of an "effective 20mp" of sensor data when the specifications tell me just that!
P4P+ doesn't seem to be the 20mp camera as claimed.

I must say that it has been disappointing to find that my new P4P+ "20mp camera" is an interpolated image from approximately just a 14mp area of the sensor.
Looking at my 2:3 format RAW images, while bypassing the DJI lens correction profile, I see the "full" image as captured by the 2:3 format sensor.
Sadly, this shows that the lens used for this camera, fails to provide and image circle large enough to cover the entire sensor and this results in black corners and image quality loss towards those corners.
DJI's lens correction profile (that is applied to JPGs in camera & automatically to RAW images in some converters) makes distortion corrections and crops a smaller portion of the image to be rid of the dodgy corners. This cropped image is approx 4829 x 2948 pixels.... far less than the claimed 5472 x 3648 in the specifications.
This lower resolution image in then interpolated (enlarged) back to the claimed 20mp size. This is done both to the JPGs and also to the RAW images in those converters that automatically apply the profile.
I'm sorry DJI, but that IS NOT the same as providing the user with an effective (and of course "usable") 20mp of image data to work with.
Please understand that I have not set my expectations too high for a "consumer grade" camera on a drone. I understand that it will never match the quality of a DSLR or similar mirrorless, but I do expect to get the use of an "effective 20mp" of sensor data when the specifications tell me just that!