20260629222128

2026-06-29 22:21:28 +08:00
1 parent 6ab4ae9c77
commit 96299ba9a2
@@ -0,0 +1,117 @@
+# -*- coding: utf-8 -*-
+import sys
+import io
+import urllib.request
+from PIL import Image
+
+URL = ("http://118.89.70.199:9001/test/finance-category-default/income/hongbao.webp"
+       "?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD"
+       "&X-Amz-Credential=54WPUR104SA9X00EKWS3%2F20260629%2Fus-east-1%2Fs3%2Faws4_request"
+       "&X-Amz-Date=20260629T105003Z&X-Amz-Expires=86400"
+       "&X-Amz-Security-Token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.eyJleHAiOjE3ODI3NzMyMDUsInBhcmVudCI6Im9uZWFvIn0.zkP6L1zg_LPy1UuK-3-VT6LEWuhLNickKWTWDly_PzJCnwIRPS4naSZE9Lx84HtXPVVhxaZguHXl65AXjROJZA"
+       "&X-Amz-Signature=b763181ad8bf74deb2ac55ac18402d26a91075088c9c109cfd3a4da6cca7b38f"
+       "&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject")
+
+out_path = r"D:\workspace\code\app\.workbuddy\hongbao.webp"
+
+req = urllib.request.Request(URL, headers={"User-Agent": "Mozilla/5.0"})
+with urllib.request.urlopen(req, timeout=60) as resp:
+    data = resp.read()
+print("Downloaded bytes:", len(data))
+with open(out_path, "wb") as f:
+    f.write(data)
+
+img = Image.open(out_path)
+print("Format:", img.format)
+print("Size:", img.size)
+print("Mode:", img.mode)
+
+# Force load pixel data
+img.load()
+
+has_alpha = img.mode in ("RGBA", "LA") or (img.mode == "P" and "transparency" in img.info)
+print("Has alpha channel:", has_alpha)
+
+if img.mode == "P":
+    # Convert palette to RGBA to inspect real pixels
+    rgba = img.convert("RGBA")
+elif img.mode != "RGBA":
+    rgba = img.convert("RGBA")
+else:
+    rgba = img
+
+w, h = rgba.size
+px = rgba.load()
+
+def info(x, y):
+    r, g, b, a = px[x, y]
+    return f"({x},{y}) RGBA=({r},{g},{b},{a})"
+
+print("\n--- Corner pixels ---")
+print("TL", info(0, 0))
+print("TR", info(w - 1, 0))
+print("BL", info(0, h - 1))
+print("BR", info(w - 1, h - 1))
+
+print("\n--- Edge midpoints ---")
+print("Top-mid", info(w // 2, 0))
+print("Bottom-mid", info(w // 2, h - 1))
+print("Left-mid", info(0, h // 2))
+print("Right-mid", info(w - 1, h // 2))
+
+# Statistics over all pixels
+total = w * h
+transparent = 0  # alpha == 0
+near_transparent = 0  # alpha < 255 and > 0
+fully_opaque = 0  # alpha == 255
+white_pixels = 0  # opaque & RGB ~ (255,255,255)
+near_white_bg = 0  # alpha==0 OR rgb near white
+
+for y in range(h):
+    for x in range(w):
+        r, g, b, a = px[x, y]
+        if a == 0:
+            transparent += 1
+        elif a < 255:
+            near_transparent += 1
+        else:
+            fully_opaque += 1
+            if r > 245 and g > 245 and b > 245:
+                white_pixels += 1
+
+print("\n--- Global statistics ---")
+print("Total pixels:", total)
+print("Fully transparent (a==0):", transparent, f"({100*transparent/total:.2f}%)")
+print("Semi-transparent (0<a<255):", near_transparent, f"({100*near_transparent/total:.2f}%)")
+print("Fully opaque (a==255):", fully_opaque, f"({100*fully_opaque/total:.2f}%)")
+print("Opaque & near-white:", white_pixels, f"({100*white_pixels/total:.2f}%)")
+
+# Border-only statistics (outer 2px ring) - this is what reveals background
+def is_border(x, y, w, h, t=2):
+    return x < t or y < t or x >= w - t or y >= h - t
+
+border_total = 0
+border_trans = 0
+border_white = 0
+for y in range(h):
+    for x in range(w):
+        if is_border(x, y, w, h):
+            border_total += 1
+            r, g, b, a = px[x, y]
+            if a == 0:
+                border_trans += 1
+            elif r > 245 and g > 245 and b > 245:
+                border_white += 1
+
+print("\n--- Border ring (outer 2px) ---")
+print("Border pixels:", border_total)
+print("Border transparent:", border_trans, f"({100*border_trans/border_total:.2f}%)")
+print("Border near-white opaque:", border_white, f"({100*border_white/border_total:.2f}%)")
+
+print("\n=== CONCLUSION ===")
+if border_trans / border_total > 0.5:
+    print("BACKGROUND IS TRANSPARENT (alpha channel, mostly a==0 at edges)")
+elif border_white / border_total > 0.5:
+    print("BACKGROUND IS WHITE (opaque near-white pixels at edges)")
+else:
+    print("Background is neither clearly transparent nor white - inspect manually")