lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler Class Reference

Inheritance diagram for lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler:

Public Member Functions
tuple[FloatImagePlane, FloatImagePlane]	__call__ (self, FloatImagePlane old_lum, FloatImagePlane new_lum, FloatImagePlane a, FloatImagePlane b)

Static Public Attributes
	saturation
	maxChroma
	brightFalloff
	equalizer_levels

Detailed Description

Definition at line 35 of file _color_scale.py.

Member Function Documentation

__call__()

tuple[FloatImagePlane, FloatImagePlane] lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler.__call__	(		self,
		FloatImagePlane	old_lum,
		FloatImagePlane	new_lum,
		FloatImagePlane	a,
		FloatImagePlane	b )

Adjusts the color saturation while keeping the hue constant.

This function adjusts the chromaticity (a, b) of colors to maintain a
consistent saturation level, based on their original luminance. It uses
the CIELAB color space representation and the `luminance` is the new target
luminance for all colors.

Parameters
----------
old_lum : `FloatImagePlane`
    Luminance values of the original colors.
new_lum : `FloatImagePlane`
    Target luminance values for the transformed colors.
a : `FloatImagePlane`
    Chromaticity parameter 'a' corresponding to green-red axis in CIELAB.
b : `FloatImagePlane`
    Chromaticity parameter 'b' corresponding to blue-yellow axis in CIELAB.

Returns
-------
new_a : `FloatImagePlane`
    New a values representing the adjusted chromaticity.
new_b : `FloatImagePlane`
    New b values representing the adjusted chromaticity.

Definition at line 64 of file _color_scale.py.

Member Data Documentation

brightFalloff

lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler.brightFalloff

static

Initial value:

=  Field[float](
        doc="The rate that saturation scaling should slow with brightness", default=800
    )

Definition at line 50 of file _color_scale.py.

equalizer_levels

lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler.equalizer_levels

static

Initial value:

=  ListField[float](
        doc=(
            "A list of factors to modify the color constrast in a scale dependent way. "
            "One coefficient for each spatial scale, starting from the largest. "
            "Values large than 1 increase contrast, while less than 1 decreases"
            "Only scales upto and including the largest to be modified need specified"
            "IE [1.1,0.9] modifieds the first two [1.1,1,0.9] modifies the first three."
        ),
        optional=True,
    )

Definition at line 53 of file _color_scale.py.

maxChroma

lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler.maxChroma

static

Initial value:

=  Field[float](
        doc=(
            "The maximum chromaticity in the OKLCh color space, large "
            "values will cause bright pixels to fall outside the RGB gamut."
        ),
        default=0.4,
    )

Definition at line 43 of file _color_scale.py.

saturation

lsst.pipe.tasks.prettyPictureMaker._functors._color_scale.ColorScaler.saturation

static

Initial value:

=  Field[float](
        doc=(
            "The overall saturation factor with the scaled luminance between zero and one. "
            "A value of one is not recommended as it makes bright pixels very saturated"
        ),
        default=0.6,
    )

Definition at line 36 of file _color_scale.py.

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The documentation for this class was generated from the following file:

• python/lsst/pipe/tasks/prettyPictureMaker/_functors/_color_scale.py