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

Started Aug 17, 2009 | Discussions thread
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dlacoutu Contributing Member • Posts: 811
Magenta edge tinging at high ISO and a possible solution...

Hello all...

K20 users may have experienced strange magenta tinging at the top and bottom edges of their pics when using high ISOs...

This pic was taken with the cap on, @6400 (shutter speed has no effect on this)...

Some time ago (and on "another" forum ) I presented a possible solution by using the masked black pixels available in both PEF and DNG files of the k20.

So thic pic:

... became this one once the black pixels were (crudely) averaged and subtracted:

(the pic took a slight green tinge because the whole pic in fact suffered from magenta tinging...)

Now, in the following thread :
http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=32600106&page=1

GordonBGood nicely proposed to try to deliver a small application that will remove this magenta tinge right in the PEF/DNG, thus greatly simplifying the post-processing steps with high ISO!

Big thanks again to him, and let's wait for the results!

 dlacoutu's gear list:dlacoutu's gear list
Samsung NX100 Pentax K-5 Samsung NX200 Pentax smc FA 50mm F1.4 Samsung NX 30mm F2 Pancake +6 more
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