A mapping for an asinh stretch, estimating the linear stretch by zscale
x = asinh(Q (I - z1)/(z2 - z1))/Q
Parameters
----------
image
The image to analyse, or a list of 3 images to be converted to an intensity image
Q : `int`
The asinh softening parameter
pedestal : `float` or sequence of `float`, optional
The value, or array of 3 values, to subtract from the images
N.b. pedestal, if not None, is removed from the images when calculating the zscale
stretch, and added back into Mapping.minimum[]
See also
--------
AsinhMapping
Definition at line 325 of file rgbContinued.py.
def lsst.afw.display.rgb.rgbContinued.Mapping.makeRgbImage |
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self, |
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imageR = None , |
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imageG = None , |
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imageB = None , |
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xSize = None , |
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ySize = None , |
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rescaleFactor = None |
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) |
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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 99 of file rgbContinued.py.
def lsst.afw.display.rgb.rgbContinued.AsinhMapping.mapIntensityToUint8 |
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self, |
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intensity |
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inherited |
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 315 of file rgbContinued.py.