(06 Sep 13, 06:01PM)Cleaner Wrote: As for chromatic aberration it's a mate of mine who showed me this trick but I wouldn't at all be able to explain what is technically happening there (he did roughly explain to me tho but I roughly forgot all about it), apparently different stuff/process from optical to digital... All I remember is that it can sometimes (not always) reduce the file's weight without affecting graphic details.
Sorry for not being able to enlighten you any further on the subject.
chromatic aberration is just a consequence of the variation of the refractive index depending on the wavelength. (basically it's what makes a prism show white light spectrum)
although i can see why it can be important in photography and why there are numerical functions to compensate this effect i'm not sure why it would reduce the jpeg size. Maybe that chromatic aberration reduction algorithms affect the "spatial frequencies" of the image, making the compression more efficient. It would be interesting to check.