On Sat, Feb 4, 2012 at 8:16 PM, Minniu Zhou <minniu2...@yahoo.com> wrote:
> About the function `Brighten in 'Lens distortion filter' > > Hi, I am Syu, I have a question and hope if some kind peoples can help me > to find the answer, > it will be very helpful for me.****** > I am not good at English, hope you will try to understand my problem. I > will try my best to write... > I am a lecturer and I want to introduce the Gimp to my students here in > Japan, using to make image processiong. > I think it is a wonderful tool and thanks all for make it possible to be > free ! > > Well, I have a question about the filter namede'Lens distortion', especially > the funtion of 'Brighten'. > It is explained as ''The 'Main' or 'Edge' options must be non zero for > this option to produce noticeable result." > Why? If I don't want to change the shape of the image, what should I do ? > Hi Syu, This function, as I understand it, is intended to correct an error of some cameras, where towards the edges of the picture -- the same areas that tend to suffer from lens distortion --, the colors are darkened. That is why the function only operates in the areas where you have specified there is distortion. If you simply wish to brighten the image, I suggest "Brightness-Contrast", found in the Colors menu. I hope that helps. David
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