@classmethod<EOL><INDENT>def blurring_grid_from_mask_and_psf_shape(cls, mask, psf_shape):<DEDENT>
blurring_mask = mask.blurring_mask_for_psf_shape(psf_shape)<EOL>return RegularGrid.from_mask(blurring_mask)<EOL>
Setup a blurring-grid from a mask, where a blurring grid consists of all pixels that are masked, but they \
        are close enough to the unmasked pixels that a fraction of their light will be blurred into those pixels \
        via PSF convolution. For example, if our mask is as follows:

        |x|x|x|x|x|x|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|x|     This is an ccd.Mask, where:
        |x|x|x|x|x|x|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|x|     x = True (Pixel is masked and excluded from lens)
        |x|x|x|o|o|o|x|x|x|x|     o = False (Pixel is not masked and included in lens)
        |x|x|x|o|o|o|x|x|x|x|
        |x|x|x|o|o|o|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|x|

        For a PSF of shape (3,3), the following blurring mask is computed (noting that only pixels that are direct \
        neighbors of the unmasked pixels above will blur light into an unmasked pixel):

        |x|x|x|x|x|x|x|x|x|     This is an example regular.Mask, where:
        |x|x|x|x|x|x|x|x|x|
        |x|x|o|o|o|o|o|x|x|     x = True (Pixel is masked and excluded from lens)
        |x|x|o|x|x|x|o|x|x|     o = False (Pixel is not masked and included in lens)
        |x|x|o|x|x|x|o|x|x|
        |x|x|o|x|x|x|o|x|x|
        |x|x|o|o|o|o|o|x|x|
        |x|x|x|x|x|x|x|x|x|
        |x|x|x|x|x|x|x|x|x|

        Thus, the blurring grid coordinates and indexes will be as follows:

        pixel_scale = 1.0"

        <--- -ve  x  +ve -->
                                                            y     x
        |x|x|x |x |x |x |x |x|x|  |   blurring_grid[0] = [2.0, -2.0]  blurring_grid[9] =  [-1.0, -2.0]
        |x|x|x |x |x |x |x |x|x|  |   blurring_grid[1] = [2.0, -1.0]  blurring_grid[10] = [-1.0,  2.0]
        |x|x|0 |1 |2 |3 |4 |x|x| +ve  blurring_grid[2] = [2.0,  0.0]  blurring_grid[11] = [-2.0, -2.0]
        |x|x|5 |x |x |x |6 |x|x|  y   blurring_grid[3] = [2.0,  1.0]  blurring_grid[12] = [-2.0, -1.0]
        |x|x|7 |x |x |x |8 |x|x| -ve  blurring_grid[4] = [2.0,  2.0]  blurring_grid[13] = [-2.0,  0.0]
        |x|x|9 |x |x |x |10|x|x|  |   blurring_grid[5] = [1.0, -2.0]  blurring_grid[14] = [-2.0,  1.0]
        |x|x|11|12|13|14|15|x|x|  |   blurring_grid[6] = [1.0,  2.0]  blurring_grid[15] = [-2.0,  2.0]
        |x|x|x |x |x |x |x |x|x| \/   blurring_grid[7] = [0.0, -2.0]
        |x|x|x |x |x |x |x |x|x|      blurring_grid[8] = [0.0,  2.0]

        For a PSF of shape (5,5), the following blurring mask is computed (noting that pixels that are 2 pixels from an
        direct unmasked pixels now blur light into an unmasked pixel):

        |x|x|x|x|x|x|x|x|x|     This is an example regular.Mask, where:
        |x|o|o|o|o|o|o|o|x|
        |x|o|o|o|o|o|o|o|x|     x = True (Pixel is masked and excluded from lens)
        |x|o|o|x|x|x|o|o|x|     o = False (Pixel is not masked and included in lens)
        |x|o|o|x|x|x|o|o|x|
        |x|o|o|x|x|x|o|o|x|
        |x|o|o|o|o|o|o|o|x|
        |x|o|o|o|o|o|o|o|x|
        |x|x|x|x|x|x|x|x|x|