question about certain effect

[cmars]

i see this fairly often, in which photo's will be darker at the four corners

of the frame but i rarely get this effect on my own experience unless by

accident. Is there an in-camera technique i am not aware of or a particular

type of equiptment/filter/lens responsible for this effect? or is it just a

coincidence of the available light.

[gdanmitchell]

It is vignetting. Some poor lenses will do this a bit at no extra charge. ;-)

 

You could fit a lens hood that isnt' big enough, and you can also simulate the effect in

software.

[cmars]

thanks dan

[cosmic_c]

One technique to get this in post processing is to do a selection in the image, using say the elipse/circle tool, of the part of the image you do not want affected. Invert the selection CNTRL I which will select the corners, feather to taste (say 10 to 30 pixels), Apply curves as an adjustment layer, darken as required and adjust opacity to fine tune.

[papasan]

another technique is to simply use the burn tool and apply to each corner to achieve the effect you want. I prefer this approach as it seems to lead more realistic results. I usually apply this on an adjustment layer for greater flexibility

[dave_dube]

The technique that Cosmic refers too is one used to direct the eyes to the point of interest. Highly effective when done well. Sounds like Cosmic has used it a time or two.<P>Regards, Dave