MaxCam Features - Setting the aspect ratio
All current iPhones use camera sensors with an aspect ratio of 4:3. As such, MaxCam for iPhone will by default capture images with this aspect ratio. However, capturing in a different than the native ratio can be useful; as an example, if the photos are intended for Instagram, it can make sense to capture them in 1:1 or square aspect ratio to reduce post processing.
To change the aspect ratio, tap the respective button in the toolbar (arrow):
(The screenshots in this post have been created with a neutral background to increase the visibility of the indicators.)
Next after the native 4:3 is the 35mm aspect ratio of 3:2 (aka "traditional"), indicated by an overlay at the left and right sides (in landscape these indicators will be at the top and bottom):
Tap again to change to 16:9, "widescreen":
Finally there's the square aspect ratio:
No matter the setting above, when shooting RAW or ProRAW, the resulting image will always be in 4:3, the native sensor resolution. When shooting JPEG or HEIF or RAW / ProRAW + JPEG, the lossy compressed image will be cropped by MaxCam to the selected aspect ratio.
Exif crop data in RAW and ProRAW images
The DNG format that is used as a container for RAW and ProRAW supports the Exif tags DefaultCropOrigin and DefaultCropSize. Cameras that support those tags (examples are Sony's CyberShots and A7 mirrorless cameras) will write a RAW image in full sensor size, but specify in the Exif metadata if the image has to be cropped. This information is honored by raw processors like Lightroom and Adobe Raw and the raw file will be displayed cropped in those applications.
When MaxCam captures a photo, the raw image is delivered by Apples framework with metadata that contains the exposure settings, the sensitivity and many other parameters. MaxCam augments this data with additional information like the GPS coordinates which are not embedded in the metadata by default. While this modification of the metadata is accepted by the framework, other tags like those regarding the image crop are unfortunately ignored and not written to the final image that is saved to the photo roll.
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