{"id":"image-threshold","engine":"media","category":"image","name":"흑백 임계값 변환","fields":[{"key":"file","label":"파일 선택","type":"file","accept":"image/png,image/jpeg,image/webp,image/gif,image/bmp","multiple":false,"required":true},{"key":"threshold","label":"임계값 (0–255)","type":"number","default":128,"min":0,"max":255,"step":1}],"sample":{}}