Take a Full 48 Megapixel Photo (without the storage issues)

How to enable the full 48MP camera lens on iPhone 15 /Pro/ProMax and iPhone 14 Pro
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Transcript:
If you purchased any of the iPhone 15 models or you have an iPhone 14 Pro or Pro Max, the main lens of your camera shipped with a 48 megapixel sensor. That gives you quadruple the amount of detail or pixels in a photo compared to the 12 megapixel sensor you’ll find on an iPhone 14 or older. However, unless you're a photo buff, the chances are you’re not benefiting from this improved lens, which remember you paid good money for. And that’s because the default resolution on all these phones is set to 24 megapixels.
The main reason for Apple doing this is storage. A 12 megapixel photo will use up roughly 2 megabytes of space whereas 24 megapixels use 3 megabytes. Prior to iOS17, if you wanted to use the whole 48 megapixels you were limited to using Apple’s ProRAW format, which as you can see, potentially requires a whopping 75 megabytes of storage per photo. However, iOS17 introduced this new HEIF Max format which reduces the space requirements of a 48 megapixel photo down to just 5 megabytes. Much more reasonable. You can still choose ProRAW but, for the majority of us who aren’t interested in white balance and exposure, the HEIF Max format is a good option. You get the full benefit of your lens without the huge storage overhead. So to enable this format, turn on ‘ProRAW and Resolution Controls’ in your camera settings and set the default to HEIF Max. If you’re seeing JPEG Max here rather than HEIF, well that's because your capture setting is set to Most Compatible rather than High Efficiency. You’ll still benefit from the 48 megapixel sensor using JPEG Max but the compression isn’t as good, with each photo using up roughly 10 megabytes of space compared to 5 in the HEIF Max format. Having enabled this setting, now when you open the camera app you’ll have this option and tapping it will shoot in 48 megapixels rather than just 24. You can also long press on the icon to choose between all the different options, just in case you fancy switching between HEIF and ProRAW.
There are a couple more things to consider when trying to maximise your megapixel count. Firstly you can’t zoom in or out. As soon as your focal length changes from 1, your photo will automatically reduce to 12 megapixels. It’s the same if you switch camera modes. Changing to Portrait mode, for example, again reduces your photo down to 12 megapixels. And finally, to absolutely max out your pixel count you need to be shooting in a 4 by 3 ratio because your sensor uses the same ratio. If you’re using 16 by 9 the camera is only using part of the sensor, thereby limiting the amount of pixels in your photo.