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| æµ®åå°æ°ç¹ã°ã©ããŒã·ã§ã³ â 8ããã â 16ããã | 16 | 256 | 0.001953602 | 819 |
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import numpy as np
from PIL import Image
ramp = np.tile(np.linspace(0, 1, 4096), (64, 1))
a8 = np.rint(ramp * 255).astype(np.uint8)
a16 = np.rint(ramp * 65535).astype(np.uint16)
wrapped = a8.astype(np.uint16) * 257
for name, values in [("ramp-8", a8), ("ramp-16", a16),
("ramp-8-in-16", wrapped)]:
Image.fromarray(values).save(name + ".png")
ããŠã³ããŒãããPNGã¯ã©ãæ€æ»ããïŒ
å¥ã®ã¢ããªã±ãŒã·ã§ã³ã§ä¿åãçŽãåã«ãããŠã³ããŒããããŸãŸã®ãã¡ã€ã«ã«å¯ŸããŠå®è¡ããŠãã ãããå®éšãšåãPythonããã±ãŒãžã䜿ãã1ãã£ã³ãã«ã®PNGãåæãšããŠããŸããRGBã®ãã¬ãã¥ãŒç»åãæž¡ããšããããé»ã£ãŠå€æããŠæ·±åºŠããŒã¿ã®ããã«èŠããã®ã§ã¯ãªããæå³çã«åæ¢ããŸãã
from pathlib import Path
import numpy as np
from PIL import Image
path = Path("depth.png")
raw = path.read_bytes()
assert raw[:8] == b"\x89PNG\r\n\x1a\n"
assert raw[12:16] == b"IHDR"
print("PNG sample depth:", raw[24])
print("PNG color type:", raw[25]) # 0 = grayscale
values = np.asarray(Image.open(path))
assert values.ndim == 2, "Inspect the grayscale export, not an RGB preview"
print("Range:", int(values.min()), int(values.max()))
print("Distinct values:", np.unique(values).size)
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