C1 with specific Graduated ND filters and LCC use
Hi
On a forum I found the following quote about using graduated ND filters :
"When I use graduated filters I often shoot the LCC calibration shot with the filter on so I can cancel out the graduated filter effect in post-processing and then add a new virtual filter which can be more precise. The graduated filter in the field helps me to get an overall better exposure, i e less noise, more dynamic range. Trees etc sticking up over the horizon line will get on the dark side of the filter and thus be a bit underexposed, but since those features often end up quite dark in the finished picture anyway there's not a big problem. The foreground where it can be quite a lot of pushing gets better exposure."
It seems quite reasonable to use : Use a graduated ND to relatively darken the sky at capture and thus be able to have an higher global exposure, the LCC then again highers the exposure for the sky and this can be lowered local as needed. Nice if there's no straight division between sky and ground. It can give a few extra stops of dynamic range.
There's one important technical question with it: How will C1 handle this situation? From the moment the LCC is applied there will be a exposure increase on the filtered regions (let's say 2 stops), which will result in some places with a higher than "255" result, otherwise the technique was not needed. Then a local adjustment need to be used to bring this back lower "below 255". --> Will C1 keep the "above 255" image data after the LCC or will it all be blown out (aka clipped at "255")?
Alain
On a forum I found the following quote about using graduated ND filters :
"When I use graduated filters I often shoot the LCC calibration shot with the filter on so I can cancel out the graduated filter effect in post-processing and then add a new virtual filter which can be more precise. The graduated filter in the field helps me to get an overall better exposure, i e less noise, more dynamic range. Trees etc sticking up over the horizon line will get on the dark side of the filter and thus be a bit underexposed, but since those features often end up quite dark in the finished picture anyway there's not a big problem. The foreground where it can be quite a lot of pushing gets better exposure."
It seems quite reasonable to use : Use a graduated ND to relatively darken the sky at capture and thus be able to have an higher global exposure, the LCC then again highers the exposure for the sky and this can be lowered local as needed. Nice if there's no straight division between sky and ground. It can give a few extra stops of dynamic range.
There's one important technical question with it: How will C1 handle this situation? From the moment the LCC is applied there will be a exposure increase on the filtered regions (let's say 2 stops), which will result in some places with a higher than "255" result, otherwise the technique was not needed. Then a local adjustment need to be used to bring this back lower "below 255". --> Will C1 keep the "above 255" image data after the LCC or will it all be blown out (aka clipped at "255")?
Alain
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Doing exposure correction in local adjustments will always sum up the total correction. So, if you have one layer with +1 ev, another with -1 and then another with +,5 ev, the processed output will have been lifted by a total of only 0,5 EV. The non-destructive approach 😊
CO will keep the data in raw, as you can always reset the adjustments, but in the final processed bitmap image, the data will be blown out.
The right tool for the right job. Expose correct (which also implies choosing the right ND filter and adjusting in the right way) when capturing will get you the furthest in terms of correction-range.0 -
[quote="Christian Gr" wrote:
Doing exposure correction in local adjustments will always sum up the total correction. So, if you have one layer with +1 ev, another with -1 and then another with +,5 ev, the processed output will have been lifted by a total of only 0,5 EV. The non-destructive approach 😊
CO will keep the data in raw, as you can always reset the adjustments, but in the final processed bitmap image, the data will be blown out.
The right tool for the right job. Expose correct (which also implies choosing the right ND filter and adjusting in the right way) when capturing will get you the furthest in terms of correction-range.
Hi Christian
Thanks for the answer. Does the LCC correction and local (exposure) adjustments also sum up?
Alain0 -
[quote="Alain" wrote:
[quote="Christian Gr" wrote:
Doing exposure correction in local adjustments will always sum up the total correction. So, if you have one layer with +1 ev, another with -1 and then another with +,5 ev, the processed output will have been lifted by a total of only 0,5 EV. The non-destructive approach 😊
CO will keep the data in raw, as you can always reset the adjustments, but in the final processed bitmap image, the data will be blown out.
The right tool for the right job. Expose correct (which also implies choosing the right ND filter and adjusting in the right way) when capturing will get you the furthest in terms of correction-range.
Hi Christian
Thanks for the answer. Does the LCC correction and local (exposure) adjustments also sum up?
Alain
Yep! Same with vignettes.0 -
[quote="Christian Gr" wrote:
[quote="Alain" wrote:
[quote="Christian Gr" wrote:
Doing exposure correction in local adjustments will always sum up the total correction. So, if you have one layer with +1 ev, another with -1 and then another with +,5 ev, the processed output will have been lifted by a total of only 0,5 EV. The non-destructive approach 😊
CO will keep the data in raw, as you can always reset the adjustments, but in the final processed bitmap image, the data will be blown out.
The right tool for the right job. Expose correct (which also implies choosing the right ND filter and adjusting in the right way) when capturing will get you the furthest in terms of correction-range.
Hi Christian
Thanks for the answer. Does the LCC correction and local (exposure) adjustments also sum up?
Alain
Yep! Same with vignettes.
Thanks0
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