====== Slope ======
Slope fits a curve, at each pixel, to how the image changes over a few wavelengths of illumination. The band values are used for the y-axis, and the band wavelengths for the x-axis.

===== Wavelengths =====
Slope reads a single multiband image. In "wavelengths", enter the wavelength of each band in nanometers, one per band. For example, green might be 530.

===== Curves and outputs =====
^ Curve ("output") ^ Bands needed ^ Parameters you can output ^
| line | at least 2 | slope, intercept |
| parabola | at least 3 | curvature, center, intercept |
| cubic | at least 4 | curvature, inflection, critical, intercept |

By default ("all"), every parameter is output, one per band, so the output has 2, 3 or 4 bands. Choose a single parameter to output only that one band.

===== Image at a wavelength =====
The "format" is **parameters** by default. Choose **image** instead to output a single band: the fitted curve's response at the wavelength you enter in "wavelength". The parameter choices then do not matter.

The output is floating point.

{{ :intermediate_level:hoku_intermediate_slope.png?nolink&1000 |Slope with its argument dialog}}