Iphone takes photos in low resolution.

I need to take pictures and upload them to a web page. A resolution of 800×600 would be enough for me.

I go to Settings> Photos and camera, but I can only find a configuration for the resolution of the video recording, but not the photos.

Does anyone know if there is any way to take a photo with the camera in low resolution?

I'm looking to avoid having to use an external application