About the sunglasses effect. A possible approach may be to take the
picture with polarizing filter (if you want) and then use graduated
density module - setting compression to 100, hue, saturation and density
to your preference and pull the dividing line to the bottom of the image
so it actually acts as nd filter. Another approach would be the color
balance module - it is also quite flexible. Curves - another good approach.
It is not "automatic" but once you have the result you are looking for
it is just a matter of preset.
Regards,
B
On 16-07-23 05:29 AM, Max Bianco wrote:
The lenses in your sunglasses are polarized I am guessing. The ND
issue, I would try taking the image with no change in exposure while
your at it.
On Sat, Jul 23, 2016, 04:40 Sebastian <[email protected]
<mailto:[email protected]>> wrote:
It could be worth trying to copy the colors of picture without
filter to
a picture taken with ND-filter using the Color mapping:
http://www.darktable.org/2013/04/color-mapping/
On 07/12/2016 06:27 PM, Stefan Klinger wrote:
> Hi, I have two questions regarding optical Filters:
>
> (1) My ND-Filter creates a slight color cast, which I would like to
> undo semi-automatically: The recipe I have in mind would be to take
> two pictures of a white surface, once with and once without the
> optical filter in place. Using the same light source and camera WB,
> but different exposure to compensate for brightness, the difference
> between the two pictures should express the unwanted color
cast. Can
> DT use this to calculate an inverse filter?
>
> (2) Similar Problem, in the other direction: Sometimes I see
landscape
> through sunglasses, and it looks nicer than without. Can I dell
DT to
> replicate the effect of my sunglasses? The recipe would be
similar as
> above: Take two shots of a defined white surface, once directly,
once
> through the glasses. The difference between the two pictures should
> be used to derive a filter function that adds the “sunglasses
effect”
> in post processing.
>
> Thank you
> Stefan
>
>
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