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style(backend): 验证码配色切换至 v3 中性色体系

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字符/干扰/噪点/底色改用 --ys-ink / --ys-ink-2 / --ys-ink-3 / --ys-paper
对应色值，与 2026-10-12 后的前端视觉方向一致；识别难度参数未变，
tests/unit/test_captcha.py 12 项通过。

Co-Authored-By: Claude Code <noreply@anthropic.com>
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liuwenxin 2026-10-19 15:55:02 +08:00
parent 8903a194c9
commit 036834a1d0
1 changed files with 6 additions and 5 deletions
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11
backend/app/core/captcha_image.py
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@ -27,11 +27,12 @@ _WIDTH, _HEIGHT = 120, 40
_FONT_SIZE = 25
_PADDING = 8
# 与前端配色呼应：墨色字符、青灰干扰、素纸底
_INK = (15, 54, 70)
_INTERFERENCE = (126, 156, 170)
_SPECKLE = (168, 183, 192)
_PAPER = (247, 246, 242)
# 与前端 v3 配色呼应（--ys-ink / --ys-ink-2 / --ys-ink-3 / --ys-paper）：
# 墨色字符、次级墨干扰、辅助墨噪点、纸白底
_INK = (28, 35, 51) # #1c2333
_INTERFERENCE = (91, 101, 119) # #5b6577
_SPECKLE = (154, 163, 178) # #9aa3b2
_PAPER = (255, 255, 255) # #ffffff
_SPECKLE_COUNT = 46
_INTERFERENCE_LINES = 2