1. 关闭手机的"美颜"功能。
2. 上午9点—下午4点时间段（避开初升的朝阳和夕阳的黄光），在室外自然散光下（散光处，不要阳光直射处）用手机拍舌头的照片。
3. 注意环境的背景色不能黑暗，避开绿色树荫以及各种彩色反光。
4. 上衣穿白色，或者用大面积的白色毛巾围着颈胸部（不能穿深色或艳丽色，以免造成反光偏色）。
5. 女性不要打口红，长头发要扎到头部后面去（以免头发的黑色反射到舌面）。
6. 拍时头微微上仰，不能让舌头被额头遮拦光线。口腔张大、舌头自然放松后伸出，近距离对准口腔舌头（是对着口腔舌头，不是对着人脸），拍时点一下对着舌头的屏幕聚焦，出现焦光圆圈时再拍照。
   多拍几张，自己选清晰的1-2张传来。达不到清晰的不能要（不要传来）。颈部白布是色彩参照物，必须拍成正白色。达不到前面说的效果必须重拍。也可同时录一段舌象视频来。
7. 刚起床时和刚吃饭、吃东西后，不要立即拍舌象。

舌象样片：

1. Turn off your phone's beauty filter.
2. Take photos between 9 AM – 4 PM (avoid sunrise/sunset yellow light). Shoot outdoors under natural diffused light (shaded area, no direct sunlight).
3. Avoid dark backgrounds, green tree shade, and any colored reflections.
4. Wear white clothing, or cover your neck/chest with a large white towel (no dark or bright colors, to prevent color cast).
5. Women: no lipstick. Long hair should be tied back (to avoid black reflections on the tongue).
6. Tilt your head slightly up so the forehead doesn't cast a shadow on the tongue. Open mouth wide, extend the tongue naturally and relaxed. Aim the camera at the tongue inside the mouth (not the face). Tap the screen to focus on the tongue — wait for the focus circle before shooting.
   Take multiple shots, pick 1-2 clearest ones. Blurry photos will not be accepted. The white cloth around your neck serves as a color reference and must appear pure white in the photo. Reshoot if needed. You may also record a short tongue video.
7. Do not photograph the tongue immediately after waking up, or right after eating/drinking.

Sample tongue photos: