Magenta edge tinging at high ISO and a possible solution...

Started Aug 17, 2009 | Discussions thread
godfrog Senior Member • Posts: 1,463
Re: Magenta edge tinging at high ISO and a possible solution...

Just took a look at what ISO 6400 looks like on my GX-20, shooting a lens cap in RAW, developed in Lightroom. Images are posted below, the the resized shots have +4 exposure (aka this is ISO 102400) and +150 brightness, to better show what the pattern looks like. The 100% crop shot does not have the +150 brightness, only +4 exposure.

Looks like correcting for this problem might be difficult on my camera, as the tinging varies from shot to shot (look at the top left corner, it has lots of green in the second shot). A greater issue is the hard vertical edge where the noise changes intensity. Ive included a real shot to show the effect this has, this shot is ISO 4500.

1. ISO 6400 lens cap shot, +4 exposure and +150 brightness

2. ISO 6400 lens cap shot, +4 exposure and +150 brightness

3. 100% crop of the noise (taken from picture 2, near top left corner, centered around the noise "edge), +4 exposure only

4. Real shot, no postprocessing besides cropping, ISO 4500

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