- Strawberry Singh, "Tutorial - Taking high-res blog snapshots for intermediate users"
- Dylan Rickenbacker, "Some Hints on Taking Pictures in Second Life"
- Luna Jubilee, "Boot Camp: Photography Preparation"
The strange reverse silhouette is expected, an effect of the Windlight setting. The bug is the darkening of the top portion of the image. If the boundary were curved, it would be like a bad commercial for sunglasses, or a commercial for bad sunglasses.
It's not just horizontal:
And it's not just along one axis, or even just once along each axis:
Needless to say, this is highly frustrating, and is not doing at all well by SL photographers. I hope you'll consider voting for VWR-7672.
P.S. Especially now that it's been pointed out, you'll see it in photos I've put up in the relatively recent past.
UPDATE: Experimentation seems to show that the culprit is the "global illumination" setting, or more accurately, turning it on provokes the bug.
UPDATE: Even more accurately--the global illumination code seems to be written to work with the size of the SL client window. If you specify a photo larger than that, you see the effect on the photo. To check progress on this issue, take a look at VWR-24178.