lsst.afw.display.rgb._rgbContinued.AsinhMapping Class Reference

Inheritance diagram for lsst.afw.display.rgb._rgbContinued.AsinhMapping:

Public Member Functions
	__init__ (self, minimum, dataRange, Q=8)
	mapIntensityToUint8 (self, intensity)
	makeRgbImage (self, imageR=None, imageG=None, imageB=None, xSize=None, ySize=None, rescaleFactor=None)
	intensity (self, imageR, imageG, imageB)

Public Attributes
	minimum = minimum

Protected Member Functions
	_convertImagesToUint8 (self, imageR, imageG, imageB)

Protected Attributes
	_slope = self._uint8Max/Q
	_soften = Q/float(dataRange)
	_uint8Max = float(np.iinfo(np.uint8).max)
	_image = image

Detailed Description

A mapping for an asinh stretch (preserving colours independent of brightness)

x = asinh(Q (I - minimum)/range)/Q

Notes
-----
This reduces to a linear stretch if Q == 0

See http://adsabs.harvard.edu/abs/2004PASP..116..133L

Definition at line 282 of file _rgbContinued.py.

Constructor & Destructor Documentation

__init__()

lsst.afw.display.rgb._rgbContinued.AsinhMapping.__init__	(		self,
			minimum,
			dataRange,
			Q = 8 )

Definition at line 294 of file _rgbContinued.py.

Member Function Documentation

_convertImagesToUint8()

lsst.afw.display.rgb._rgbContinued.Mapping._convertImagesToUint8 ( self, imageR, imageG, imageB )

protectedinherited

Use the mapping to convert images imageR, imageG, and imageB to a triplet of uint8 images

Definition at line 176 of file _rgbContinued.py.

intensity()

lsst.afw.display.rgb._rgbContinued.Mapping.intensity ( self, imageR, imageG, imageB )

inherited

Return the total intensity from the red, blue, and green intensities

Notes
-----
This is a naive computation, and may be overridden by subclasses

Definition at line 160 of file _rgbContinued.py.

makeRgbImage()

lsst.afw.display.rgb._rgbContinued.Mapping.makeRgbImage ( self, imageR = None, imageG = None, imageB = None, xSize = None, ySize = None, rescaleFactor = None )

inherited

Convert 3 arrays, imageR, imageG, and imageB into a numpy RGB image

imageR : `lsst.afw.image.Image` or `numpy.ndarray`, (Nx, Ny)
    Image to map to red (if `None`, use the image passed to the ctor)
imageG : `lsst.afw.image.Image` or `numpy.ndarray`, (Nx, Ny), optional
    Image to map to green (if `None`, use imageR)
imageB : `lsst.afw.image.Image` or `numpy.ndarray`, (Nx, Ny), optional
    Image to map to blue (if `None`, use imageR)
xSize : `int`, optional
    Desired width of RGB image. If ``ySize`` is `None`, preserve aspect ratio
ySize : `int`, optional
    Desired height of RGB image
rescaleFactor : `float`, optional
    Make size of output image ``rescaleFactor*size`` of the input image

Definition at line 98 of file _rgbContinued.py.

mapIntensityToUint8()

lsst.afw.display.rgb._rgbContinued.AsinhMapping.mapIntensityToUint8	(		self,
			intensity )

Return an array which, when multiplied by an image, returns that image mapped to the range of a
uint8, [0, 255] (but not converted to uint8)

The intensity is assumed to have had minimum subtracted (as that can be done per-band)

Reimplemented from lsst.afw.display.rgb._rgbContinued.Mapping.

Definition at line 314 of file _rgbContinued.py.

Member Data Documentation

_image

lsst.afw.display.rgb._rgbContinued.Mapping._image = image

protectedinherited

Definition at line 96 of file _rgbContinued.py.

_slope

lsst.afw.display.rgb._rgbContinued.AsinhMapping._slope = self._uint8Max/Q

protected

Definition at line 307 of file _rgbContinued.py.

_soften

lsst.afw.display.rgb._rgbContinued.AsinhMapping._soften = Q/float(dataRange)

protected

Definition at line 312 of file _rgbContinued.py.

_uint8Max

lsst.afw.display.rgb._rgbContinued.Mapping._uint8Max = float(np.iinfo(np.uint8).max)

protectedinherited

Definition at line 87 of file _rgbContinued.py.

minimum

lsst.afw.display.rgb._rgbContinued.Mapping.minimum = minimum

inherited

Definition at line 95 of file _rgbContinued.py.

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

• python/lsst/afw/display/rgb/_rgbContinued.py