Vips.Image.tonelut (original) (raw)

Constructor

Vips Imagetonelut

Declaration [src]


int
vips_tonelut (
  VipsImage** out,
  ...
)

Description [src]

vips_tonelut() generates a tone curve for the adjustment of image levels.

This is mostly designed for adjusting the L* part of a LAB image in a way suitable for print work, but you can use it for other things too.

The curve is an unsigned 16-bit image with (in_max + 1) entries, each in the range [0, out_max].

Lb, Lw are expressed as 0-100, as in LAB colour space. You specify the scaling for the input and output images with the in_max andout_max parameters.

Optional arguments

in_max: gint, input range
out_max: gint, output range
Lb: gdouble, black-point [0-100]
Lw: gdouble, white-point [0-100]
Ps: gdouble, shadow point (eg. 0.2)
Pm: gdouble, mid-tone point (eg. 0.5)
Ph: gdouble, highlight point (eg. 0.8)
S: gdouble, shadow adjustment (+/- 30)
M: gdouble, mid-tone adjustment (+/- 30)
H: gdouble, highlight adjustment (+/- 30).

This constructor is not directly available to language bindings.

Parameters

out

Type: VipsImage

Output image.

The argument will be set by the function.
The caller of the function takes ownership of the returned data, and is responsible for freeing it.

...

Type: ``

NULL-terminated list of optional named arguments.

Return value

Type: int

0 on success, -1 on error.

Vips.Image.tonelut (original) (raw)

Constructor