Config
The 'Config' page in the Tools tab-pages contains commands to configure the current CPT File. The commands let you set or change the Color Model, the Hinge, and the Range.
The Color Model defines how the colors in the CPT file are specified. You can choose: RGB values (r,g,b in 0-255 range), HSV values (h in 0-360, s,v in 0-1 range), or CMYK values (c,m,y,k in 0-1 range). For the 'GMT programs, a COLOR_MODEL setting in the color palette file will override the setting in the 'gmtdefaults' file. Note that 'HSV' and 'HSB' are the same thing, but 'HSV' and 'HSL' are not.
The Hinge marks the Value where a range changes from negative to positive. It is usually '0', but can be any value within the Range. It is used to treat the two halves of the CPT file differently when normalizing to fit the User's range.
The Range is often present when the Values have been Normalized, and is required if the values need to be compared to a Denormalized data-set. The Range should be entered as 0/xxxx or -xxxx/0 if there is no hinge, or -xxxx/xxxx if there is a hinge, where 'xxxx' is a value in feet or metres.