I noticed that too, and my initial thought was to merge them.
But then I realized that many people use "photo" or "photograph" to mean the result of a camera, but "photography" to mean the process of using a camera.
Software that edits/organizes/adjusts/filters photos is very different than software that records/takes photographs.
Having tags that reflect these differences is important.
Perhaps "photograph" can be a synonym of "image", "photograph-editor" could be created as a synonym of "image-editor", and "photograph-processor" could be a synonym of "image-processor" (currently called "image-processing", but that's another discussion). That would give those types of Q/A a happy home.
It would then follow that "photography" could be used for taking pictures, and perhaps "video-recording" could be used for recording videos (aka motion pictures).
Now the trick will be if someone wants to apply a photographic filter to an image. Their inclination would probably be to tag it under "photography". The best place would probably by "image-processor", but it will take some effort to get people to use that system.
Another solution would be for "photography" to be a modifier tag; thus, one would tag a photographic filter as "image-processor" and "photography". That dilutes to power of "photography" a bit, but is more likely to be accepted and used.