analyzing known fireflies

useful string formatting for debug.py

def is_firefly(rgba):
    if (any(rgba) == 1.0) and (sum(rgba) > 3.8):
        return True


""" found coordinates to look at """
pixels_of_interest = [[28,764]]
#[  [424,706], [178,864], [67,68], [58,110],
#    [16,123], [21,169], [81,218], [49,422], 
#    [56,603], [29,637], [60,643], [31,686], 
#    [6, 720], [28,764]]
    
def rounded_rgba(rgba):
    return ["{0:.4f}".format(component) for component in rgba]
    


print('-----------------')
for r,c in pixels_of_interest:
    idx = co_to_idx(r, c, w)
    rgba = rgba_from_index(idx, pxs)
    rgba_str = rounded_rgba(rgba)
    # print(r,c, '-->', rgba_str,'-->', is_firefly(rgba))
    print('r={0:s}\ng={1:s}\nb={2:s}\na={3:s}\n'.format(*rgba_str)) 

yx.py

# y,x = r,c  # you might be familiar with the other way around x,y = c,r

import bpy

D = bpy.data
img = D.images['Chester mG_fireflies.tga']
pxs_slow = pixels = img.pixels

#recast, faster
pxs = list(pxs_slow)

w = width = img.size[0]
h = height = img.size[1]

num_pixels = len(pxs)

#equivalent statements
#gl = grouped_list = [pxs[i:i+4] for i in range(0, num_pixels, 4)]
gl = grouped_list = [pxs[i:i+4] for i in range(num_pixels)[::4]]


def idx_to_co(idx, width):
    r = int(idx / width)
    c = idx % width
    return r, c


def co_to_idx(r, c, width):
    return r * width + c


def rgba_from_index(idx, pxs):
    start_raw_index = idx * 4
    return pxs[start_raw_index:start_raw_index+4]


def is_firefly(rgba):
    if (any(rgba) == 1.0) and (sum(rgba) > 3.8):
        return True


""" found coordinates to look at """
pixels_of_interest = [
    [424,706], [178,864], [67,68], [58,110],
    [16,123], [21,169], [81,218], [49,422], 
    [56,603], [29,637], [60,643], [31,686], 
    [6, 720], [28,764]]
    

print('-----------------')
for r,c in pixels_of_interest:
    idx = co_to_idx(r, c, w)
    rgba = rgba_from_index(idx, pxs)
    print(r,c, '-->', rgba,'-->', is_firefly(rgba))