in camera raw, chromatic aberration specified integer in [-100,100], i'm not sure quantitative meaning. example, if set red/cyan fringe +100, how many percent red channel larger other 2 channels?
in www.photozone.de, ca given number of pixels @ image borders. guess borders means left , right borders in landscape orientation. example, "2 pixels @ border" 3000x2000 image means 0.133% (2/1500). way, don't think way quantify ca because same lens have different ca value different pixel density.
in dcraw, ca directly specified enlargement ratio. quoting dcraw manual: "-c red_mag blue_mag: enlarge raw red , blue layers given factors, typically 0.999 1.001, correct chromatic aberration". gives minimal ambiguity, , same lens have same ca value no matter in full frame or aps-c, no matter in 8mp or 10mp.
come question. i'm asking because measured ca of photos. i'm switching camera raw, , want make use of old measurement. need way conversion.
thank you.
in www.photozone.de, ca given number of pixels @ image borders. guess borders means left , right borders in landscape orientation. example, "2 pixels @ border" 3000x2000 image means 0.133% (2/1500). way, don't think way quantify ca because same lens have different ca value different pixel density.
in dcraw, ca directly specified enlargement ratio. quoting dcraw manual: "-c red_mag blue_mag: enlarge raw red , blue layers given factors, typically 0.999 1.001, correct chromatic aberration". gives minimal ambiguity, , same lens have same ca value no matter in full frame or aps-c, no matter in 8mp or 10mp.
come question. i'm asking because measured ca of photos. i'm switching camera raw, , want make use of old measurement. need way conversion.
thank you.
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