OS Xのマウスポインターを半透明にする ref: http://qiita.com/yyu/items/5cc554f26dddc1c1b5d5

convert.py

from base64 import decodestring, encodestring
from xml.etree.ElementTree import ElementTree
import sys
import io
from PIL import Image

inputfile  = sys.argv[1].strip()
outputfile = sys.argv[2].strip()
opacity    = sys.argv[3].strip()

tree = ElementTree()
tree.parse(inputfile)

imagedata = tree.findall("dict/dict/dict/array/data")

for i in imagedata:
    img = decodestring(i.text)

    img  = Image.open(io.BytesIO(img))
    img  = img.convert('RGBA')
    data = img.getdata()

    new = []
    for p in data:
        new.append((p[0], p[1], p[2], int(p[3] * opacity)))

    img.putdata(new)
    img.save('temp.png', 'PNG')

    result = open('temp.png', 'r')
    base64 = encodestring(result.read())
    result.close()

    i.text = base64

tree.write(outputfile)

file0.txt

$ pip install Pillow

file2.txt

$ python convert.py /path/to/dumpfile.cape output.cape 0.5

set_cursor_size.scpt

tell application "Mousecape"
    activate
end tell

delay 0.1

tell application "System Events" to tell application process "Mousecape"
    click (menu item 3 of menu 1 of menu bar item 2 of menu bar 1)
    set theSlider to slider 1 of window 1
    set value of theSlider to 3.0
end tell

quit application "Mousecape"