scl
Syntax
- int scl(int a, int il, int ih, int ol, int oh)
Arguments
- a
- An integer value for the 'A' value.
- il
- An integer value for the lower limit of the input range.
- ih
- An integer value for the higher limit of the input range.
- ol
- An integer value for the lower limit of the output range.
- oh
- An integer value for the higher limit of the output range.
Return
- An integer in the range of [ol,oh].
Description
- Scales value a from range [il,ih] to range [ol,oh].
Example
%ffp
ctl(0): "Stretch", range = (0, 255)
R = scl(r, 0, 255, -ctl(0), 255 + ctl(0));
G = scl(g, 0, 255, -ctl(0), 255 + ctl(0));
B = scl(b, 0, 255, -ctl(0), 255 + ctl(0));
Also see
- mix
Comments
- If il and oh are 0, the following simple formula performs better: result = a * oh / ih;
- Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.