Perspective

I'd like to talk about the importance of perspective - often the most forgotten ingredient in PSC
entries (with reflection and shadow realism a close second/third).

Have you ever looked at an entry and thought "something looks wrong here, but I can't quite put
my finger on it"? Well, 9 times out of 10, it's probably a perspective problem.

Sometimes you can cheat or "force the perspective" without it being an obvious problem, just as you
can cheat the realism of shadows/reflections to some degree. A recent contest example is illustrated by
this entry of Patre's, which did quite well:

Being a secure and well-adjusted newbie, Patre welcomed my comment and asked for clarification of this issue,
so here we are. The perspective problem here is caused by a conflict between the camera point-of-view (POV) in
the original background image versus the new source (foreground). One POV is higher than the other. The tell-tale
signs are the areas I've highlighted below plus what can be seen of the horse itself:

Note how in the foreground, the side rails on either side of the track (flashing blue) are vertically close together -
indicating that they are approaching alignment with the horizon. Also note that we can see little of the top of the
horse's body (we are not looking DOWN onto the horse at all) - indicating that the horizon runs through it somewhere.
These, and similar key pointers in the background image, allow us to project an imaginary horizon-line for each POV:

The mis-match between the 2 camera POV's (and their horizon-lines) is what causes the final image to look odd.
To remedy this, we can move the original background image down so that its horizon approaches the same level as
the new foreground image:

So... when choosing a compatible source image to combine with another, ask yourself "Does the camera have a similar
enough point-of-view in each image?"... and discover the joy of good perspective.