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T O P I C R E V I E W
Peter Wagner	Posted - Aug 16 2013 : 04:29:55 The manual just says that the parameters a, b, c and d are coefficients for each colour channel, but what do they each do and what are the range of values? PKWagner
2 L A T E S T R E P L I E S (Newest First)
Peter Wagner	Posted - Sep 06 2013 : 01:15:21 Thanks, this is what I had assumed. All I want to do is to radially stretch/compress the red and blue channels independently VERY slightly to correct chromatic aberrations. I was hoping you might be able to indicate what each parameter did and typical values to give a very small uniform radial stretch/compression. PKWagner
fab	Posted - Sep 06 2013 : 01:03:41 Hello, they are coefficients of the correction formula which maps pixels to new position. You should find the empirically using the "radial" demo.