08-14-2018, 02:30 AM
I think the "Color>Color Temperature" control (menu selection) is a new tool in GIMP 2.10. The term "Color Temperature" arises in other image processing software in the context of "White Balance" which as best I can tell is something that needs to be taken into account in order to develop the RAW image data available from some cameras. I believe it is the way to advise the software about the light conditions of the scene when the image was shot. While this provides a way to develop the RAW data in a manner that provides a more faithful/realistic reproduction of the original scene the software also allows for adjustments to be made that can alter an image to suite the artist intent of the photographer.
Insofar as GIMP does not develop RAW data it would seem that the later is what GIMP could do. Other image processing software commonly use the term "White Balance" for a control from which "Color Temperature" can be adjusted. This tool in GIMP 2.10 is the only one where I've noticed 2 rather than 1 adjustment. In my mind, it's always been thought of as a way to increase or decrease the temperature from what it is to start with. From experimentation it appears as though the same results can be achieved by either lowering what GIMP calls the "Original Temperature" or increasing what GIMP calls the "Intended Temperature" or visa versa. In that, the only thing that matters is the difference between the 2 settings. There is no need for 2 values (i.e., Original and Intended) to do this.
What am I missing? Is there some reason for supplying 2 values verses 1 (which would simply be the amount to increase or decrease)?
Insofar as GIMP does not develop RAW data it would seem that the later is what GIMP could do. Other image processing software commonly use the term "White Balance" for a control from which "Color Temperature" can be adjusted. This tool in GIMP 2.10 is the only one where I've noticed 2 rather than 1 adjustment. In my mind, it's always been thought of as a way to increase or decrease the temperature from what it is to start with. From experimentation it appears as though the same results can be achieved by either lowering what GIMP calls the "Original Temperature" or increasing what GIMP calls the "Intended Temperature" or visa versa. In that, the only thing that matters is the difference between the 2 settings. There is no need for 2 values (i.e., Original and Intended) to do this.
What am I missing? Is there some reason for supplying 2 values verses 1 (which would simply be the amount to increase or decrease)?