lsst.afw  21.0.0-19-g1706eef1c+e734d31160
Public Member Functions | Public Attributes | List of all members
lsst.afw.display.rgb.rgbContinued.AsinhMapping Class Reference
Inheritance diagram for lsst.afw.display.rgb.rgbContinued.AsinhMapping:
lsst.afw.display.rgb.rgbContinued.Mapping lsst.afw.display.rgb.rgbContinued.AsinhZScaleMapping

Public Member Functions

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

Public Attributes

 minimum
 

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__()

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

Reimplemented in lsst.afw.display.rgb.rgbContinued.AsinhZScaleMapping.

Definition at line 294 of file rgbContinued.py.

Member Function Documentation

◆ intensity()

def 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()

def 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()

def 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

◆ minimum

lsst.afw.display.rgb.rgbContinued.Mapping.minimum
inherited

Definition at line 95 of file rgbContinued.py.


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