A mapping for an asinh stretch (preserving colours independent of brightness)
x = asinh(Q (I - minimum)/range)/Q
Notes
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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.
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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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.
def lsst.afw.display.rgb._rgbContinued.AsinhMapping.mapIntensityToUint8 |
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self, |
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intensity |
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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.