Hi all,
most SIGMA users already know, that pictures that contain large-scale and bright garish red picture elements often cause severe problems.
In these cases, the very sensitive red-channel overflows.
The best way to handle this problem is to "underexpose" these shots when shooting them. Later, when developing the image, one might correct exposure to the necessary extent .... then things are done with!
But ... what can be done, when such a (problem) shot was taken without exposure correction.
Coincidentally, I happened to find a solution to recover such shots ...
Let us have a look at the issue:
View attachment 276
Well, I took this photo with my SD14 with NO exposure-corrections (multi spot metering). As expected, the red channel strongly overflows ... as the histogramme clearly indicates .... All SPP sliders are in "0"-position.
The rose does not look nice ... somehow washed out ... no fine details in the rose's petals ....
View attachment 277
The only options to correct the histogramm are first to darken the image until the red cahannel performs correctly (let us forget this!) or to reduce colour-saturation to the necessary extent ... let us watch this option...
View attachment 278
Well, now we have detailed structures in all petals but ... the rose looks pale and flat now ... no real solution, I think.
View attachment 279
As I found out ... the X3F-RAW-file is not the problem! It contains the necessary image information ... In this case it is the SPP converter, which cannot handle this problem.
I took another converter ... namely RAW-PHOTO-STUDIO.
First the RAW with NO corrections ....
View attachment 280
The problems now are exactly the same compared to SPP! The red channel overflows absolutely .... as the histogramme indicates, too.
But, RPS provides the option, to adjust different colours differently and independently. So, you can adjust the red colour range independently as far as colour saturation and brightness are concerned. This is, what I just did in the next step ... a very small correction of the image contrast ... and ..
View attachment 281
Now watch the detailed structures of the petals, colour saturation and the histogramme.
Done, I would say.
View attachment 282
See you with nice pictures
Klaus
most SIGMA users already know, that pictures that contain large-scale and bright garish red picture elements often cause severe problems.
In these cases, the very sensitive red-channel overflows.
The best way to handle this problem is to "underexpose" these shots when shooting them. Later, when developing the image, one might correct exposure to the necessary extent .... then things are done with!
But ... what can be done, when such a (problem) shot was taken without exposure correction.
Coincidentally, I happened to find a solution to recover such shots ...
Let us have a look at the issue:
View attachment 276
Well, I took this photo with my SD14 with NO exposure-corrections (multi spot metering). As expected, the red channel strongly overflows ... as the histogramme clearly indicates .... All SPP sliders are in "0"-position.
The rose does not look nice ... somehow washed out ... no fine details in the rose's petals ....
View attachment 277
The only options to correct the histogramm are first to darken the image until the red cahannel performs correctly (let us forget this!) or to reduce colour-saturation to the necessary extent ... let us watch this option...
View attachment 278
Well, now we have detailed structures in all petals but ... the rose looks pale and flat now ... no real solution, I think.
View attachment 279
As I found out ... the X3F-RAW-file is not the problem! It contains the necessary image information ... In this case it is the SPP converter, which cannot handle this problem.
I took another converter ... namely RAW-PHOTO-STUDIO.
First the RAW with NO corrections ....
View attachment 280
The problems now are exactly the same compared to SPP! The red channel overflows absolutely .... as the histogramme indicates, too.
But, RPS provides the option, to adjust different colours differently and independently. So, you can adjust the red colour range independently as far as colour saturation and brightness are concerned. This is, what I just did in the next step ... a very small correction of the image contrast ... and ..
View attachment 281
Now watch the detailed structures of the petals, colour saturation and the histogramme.
Done, I would say.
View attachment 282
See you with nice pictures
Klaus