Doug Kerr
Well-known member
"We" often point out that one of the advantages of working with the raw output of a camera is that we have the opportunity to employ different demosaicing algorithms, perhaps those that perform better (maybe especially in some particular situation) than the one used for in-camera development.
But we don't hear much about people actually exploiting this flexibility. On the other hand, most of the raw development tools don't really give us a choice. So we have to hope that the one they use is "better" than, for example, the one used in ACR. Or that the one used in ACR is "better" than the one used in our camera.
I have over the last few days looking at the raw development program Raw Therapee, and one of the first things I noticed was that it offers a choice among ten demosaicing algorithms, and for each of them, a choice of a parameter identified as "number of false color suppression steps". It is discussed here in part of the Raw Therapee holy writ (the RawPedia):
http://50.87.144.65/~rt/w/index.php?title=Demosaicing#False_Color_Suppression_Steps
The default algorithm there is designated in the menu "amaze"; I find out that its real designation is AMaZE (Aliasing Minimization and Zipper Elimination).
I looked about for some discussion, pertinent to our context, of the pros and cons of different available algorithms, and found this very nice article:
https://johnwiddall.wordpress.com/2014/02/06/raw-processors-which-demosaicing-method-part1/
Best regards,
Doug
But we don't hear much about people actually exploiting this flexibility. On the other hand, most of the raw development tools don't really give us a choice. So we have to hope that the one they use is "better" than, for example, the one used in ACR. Or that the one used in ACR is "better" than the one used in our camera.
I have over the last few days looking at the raw development program Raw Therapee, and one of the first things I noticed was that it offers a choice among ten demosaicing algorithms, and for each of them, a choice of a parameter identified as "number of false color suppression steps". It is discussed here in part of the Raw Therapee holy writ (the RawPedia):
http://50.87.144.65/~rt/w/index.php?title=Demosaicing#False_Color_Suppression_Steps
The default algorithm there is designated in the menu "amaze"; I find out that its real designation is AMaZE (Aliasing Minimization and Zipper Elimination).
I looked about for some discussion, pertinent to our context, of the pros and cons of different available algorithms, and found this very nice article:
https://johnwiddall.wordpress.com/2014/02/06/raw-processors-which-demosaicing-method-part1/
Best regards,
Doug