Fighting the red dots in high ISO images is one of the largest challenges
in processing of my images taken by SONY A550 camera. To beat it I use the
hot pixels module with threshold set to 0 and usually checked the detect by
3 neighbours option as well or I use the demosaic module with colour
smoothing option set to two times. Sometimes one time is enough. But I
definitely have no idea what of these two is better approach regarding the
negative effect on the overall image quality or if these two approaches
shout be avoided in favour of another one. Any advice from much more
experienced user would be appreciated.
2013/10/3 Willem Ferguson <[email protected]>
> I use a Canon 7D. On several occasions, when taking photographs at
> relative high ISO (e.g. 1600 or 2000), I have noticed red dots on the
> image. See this image:
> https://www.dropbox.com/s/i0ck3yx4o341npb/IMG_9300.jpg
> Look at the crest of the turaco and also in the dark areas at the base
> of the tail.
> When viewing the image on different image viewers, the red dot is
> present in the original CR2. I conclude this is not an artifact of image
> processing, although it becomes much more obvious when doing some
> edits, e.g. increasing the brightness and the red dots change when
> magnifying an image.
> I have 2 questions:
> 1) What causes this?
> 2) Is there an easy way in dt to remove it?
> Kind regards,
> Willem Ferguson
>
>
>
>
>
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