What's happened to BG ??

Hi All,

Can anyone shed some light as to why the background in this image looks like it does (ie pixelated and a brown blob??), not had any probs processing my other KF shots (around 100)all with same BG.

There is only a very slight dark area on the RAW, but some how during PP it has magnified and become a hell of a lot more apprarent.
I'm a stumped any help would be good.

Regards

Rob

PS it is virtually full frame so not a big crop, just cropped for composition.

There's a definite partial circle infront of the beak that I can see Rob and yep, that brown OoF bit does look odd - send me the CR2 file

Are you using CamRaw to import or another prog like CapOne, and does it look like this as a full size 16bit TIFF or has this just happened on compression to jpeg?

This is a cracking capture though - great action shot

It wasn't the BG that attracted my attention, it was the olympic fish in the bottom of the frame!

Great image, bet that Kingfisher was gutted!

Chris.

Hi Rob there will be 2 or 3 things contributing to the effect one is lens design, canon design their long lenses to have a large amount of spherical aberration after the focus point which gives you the smooth background, sometimes this can have a negative effect depending on the aperture and focus distance and any bright objects in that distance, that is the explanation for the brown bob possibly, as for the pixelated area I would imagine that has something to do with the converter you are using/colour space / Gammet sometimes 16-bit doesn't really compress well to 8bit.

Phillip.