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Excellent portrait! this is a perfect example of what i need to understand, what is that halo like thing on the image, is this polarization? how do we avoid it?
If you are talking about what I think you are talking about, that halo affect that you are seeing has nothing to do with the image necessarily, but is a byproduct of image compression. You can help eliminate that if you add a little blur when you compress, but it defeats the crispness we all try to get in our images. So to truly eliminate it, you need to use less compression, which in turn gives larger file sizes. Another way to attempt to get around that compression artifact is by using a different file type like a PNG or TIFF. Again though, bigger filesizes... I could go on and on about compression and web suitability, but if I am seeing what you are asking about, that's the reason in a nutshell.