<feat> Image Generation 결과 일관성을 위해 BedrockService 프롬프트 수정 및 결과물 tuning 파라미터화

src/main/kotlin/com/tondo/api/infrastructure/aws/bedrock/service/BedrockService.kt

@@ -157,17 +157,17 @@ class BedrockService(
     private fun buildStabilityRequest(request: BedrockImageRequest): Map<String, Any> {
         val body = mutableMapOf<String, Any>(
             "prompt" to request.prompt,
-            "mode" to "text-to-image",
-            "aspect_ratio" to "1:1",
             "output_format" to "png"
         )
 
-        if (request.negativePrompt.isNotBlank()) {
-            body["negative_prompt"] = request.negativePrompt
+        if (request.referenceImageBase64 != null) {
+            body["mode"] = "image-to-image"
+            body["image"] = request.referenceImageBase64
+            body["strength"] = 0.65 // Fine-tuning 을 위해 조정해야하는 파라미터. 0으로 가까울수록 Skeletal 이미지에 가깝게, 멀 수록 artistic.
         }
 
-        if (request.referenceImageBase64 != null) {
-            log.warn("Stability Core v1 does not support img2img. Reference image ignored.")
+        if (request.negativePrompt.isNotBlank()) {
+            body["negative_prompt"] = request.negativePrompt
         }
 
         return body

src/main/kotlin/com/tondo/api/infrastructure/aws/bedrock/template/BedrockPromptTemplate.kt

@@ -57,11 +57,16 @@ object BedrockPromptTemplate {
 //    }
     fun createImageGenerationPrompt(voiceColor: String = "#97b6e1"): String {
         return """
-            High-quality acrylic painting on canvas, 
-            intricate Chladni pattern with geometric symmetry, 
-            primary color palette of $voiceColor with deep contrasting shadows, 
-            thick brushstroke texture, rhythmic pointillism, 
-            modern abstract art style, 8k resolution, masterpiece.
-        """.trimIndent()
+          Sophisticated acrylic painting on textured canvas,
+          preserving the exact geometric Chladni pattern structure,
+          primary color $voiceColor with deep dark tones in shadow regions and vibrant bright tones in highlights,
+          colors structurally distributed along the geometric forms,
+          bold and dynamic composition,
+          fine acrylic brushstroke texture,
+          reinterpreted pointillism with flowing continuous lines instead of dots,
+          binary contrast of light and shadow,
+          symmetrical structure with rich thick paint texture,
+          smartphone wallpaper, 8k resolution, masterpiece
+      """.trimIndent()
     }
 }

src/main/resources/application.yml

@@ -2,4 +2,4 @@ spring:
   application:
     name: tondo-api
   profiles:
-    active: prod # 로컬 개발 환경을 기본으로 설정 (필요에 따라 prod, test 등으로 변경)
+    active: local # 로컬 개발 환경을 기본으로 설정 (필요에 따라 prod, test 등으로 변경)