diff --git a/server/API.md b/server/API.md
index 9840d03..a7fec85 100644
--- a/server/API.md
+++ b/server/API.md
@@ -167,6 +167,8 @@ Returns all project summaries, sorted by `updatedAt` descending.
   "prompt": "为 still day 品牌服装独立站设计官网视觉方向",
   "imageModel": "gpt-image-2",
   "imageSize": "1024x1024",
+  "imageQuality": "auto",
+  "imageCount": 1,
   "enableWebSearch": true
 }
 ```
@@ -217,6 +219,8 @@ Deletes the project record. PostgreSQL cascades canvas nodes, chat messages, his
   "enableWebSearch": false,
   "imageModel": "gpt-image-2",
   "imageSize": "1024x1024",
+  "imageQuality": "auto",
+  "imageCount": 1,
   "mode": "design"
 }
 ```
@@ -253,7 +257,7 @@ The generation path uses the configured design agent runner. The default is the
 }
 ```
 
-`layer-separation` returns a task id that can be polled with `GET /api/generator/tasks?task_id=<id>&project_id=<project-id>`. Completed tasks return a clean background image, foreground image artifacts with `bbox`, and a `text_render_data` artifact for editable text reconstruction.
+`layer-separation` returns a task id that can be polled with `GET /api/generator/tasks?task_id=<id>&project_id=<project-id>`. When layered output is available, the service asks GPT Image 2 for a PSD, converts PSD layers into canvas image/text nodes, and falls back to the local separation path if PSD generation or decoding fails. Completed tasks return a clean background image, foreground image artifacts with `bbox`, and a `text_render_data` artifact for editable text reconstruction.
 
 The canvas `edit-elements` node action uses the same separation path but writes the separated result beside the original image. The original image remains unchanged; the clean background is a bottom image layer, and a transparent frame above it holds the separated foreground images and editable text layers.
 
diff --git a/server/img_infinite_canvas.api b/server/img_infinite_canvas.api
index 116f919..b603838 100644
--- a/server/img_infinite_canvas.api
+++ b/server/img_infinite_canvas.api
@@ -330,6 +330,8 @@ type CreateProjectRequest {
 	Prompt           string `json:"prompt,optional"`
 	ImageModel       string `json:"imageModel,optional"`
 	ImageSize        string `json:"imageSize,optional"`
+	ImageQuality     string `json:"imageQuality,optional"`
+	ImageCount       int64  `json:"imageCount,optional"`
 	EnableWebSearch  bool   `json:"enableWebSearch,optional"`
 	AllowEmptyPrompt bool   `json:"allowEmptyPrompt,optional"`
 }
@@ -508,11 +510,13 @@ type CandaThreadStatusResponse {
 }
 
 type GenerateRequest {
-	Id         string `path:"id"`
-	Prompt     string `json:"prompt"`
-	Mode       string `json:"mode,optional"`
-	ImageModel string `json:"imageModel,optional"`
-	ImageSize  string `json:"imageSize,optional"`
+	Id           string `path:"id"`
+	Prompt       string `json:"prompt"`
+	Mode         string `json:"mode,optional"`
+	ImageModel   string `json:"imageModel,optional"`
+	ImageSize    string `json:"imageSize,optional"`
+	ImageQuality string `json:"imageQuality,optional"`
+	ImageCount   int64  `json:"imageCount,optional"`
 }
 
 type AgentContent {
@@ -549,6 +553,8 @@ type AgentChatRequest {
 	EnableWebSearch       bool               `json:"enableWebSearch,optional"`
 	ImageModel            string             `json:"imageModel,optional"`
 	ImageSize             string             `json:"imageSize,optional"`
+	ImageQuality          string             `json:"imageQuality,optional"`
+	ImageCount            int64              `json:"imageCount,optional"`
 	Mode                  string             `json:"mode,optional"`
 }
 
@@ -613,13 +619,14 @@ type GeneratorTaskRequest {
 }
 
 type GeneratorTaskInputArgs {
-	AspectRatio string         `json:"aspect_ratio,optional"`
-	Image       []string       `json:"image,optional"`
-	ImageUrl    string         `json:"image_url,optional"`
-	Prompt      string         `json:"prompt,optional"`
-	Resolution  string         `json:"resolution,optional"`
-	SrcBox      *NormalizedBox `json:"src_box,omitempty,optional"`
-	DstBox      *NormalizedBox `json:"dst_box,omitempty,optional"`
+	AspectRatio  string         `json:"aspect_ratio,optional"`
+	Image        []string       `json:"image,optional"`
+	ImageUrl     string         `json:"image_url,optional"`
+	OutputFormat string         `json:"output_format,optional"`
+	Prompt       string         `json:"prompt,optional"`
+	Resolution   string         `json:"resolution,optional"`
+	SrcBox       *NormalizedBox `json:"src_box,omitempty,optional"`
+	DstBox       *NormalizedBox `json:"dst_box,omitempty,optional"`
 }
 
 type GeneratorTaskSubmitRequest {
diff --git a/server/internal/types/types.go b/server/internal/types/types.go
index fd053e5..0d8807b 100644
--- a/server/internal/types/types.go
+++ b/server/internal/types/types.go
@@ -41,6 +41,8 @@ type AgentChatRequest struct {
 	EnableWebSearch       bool               `json:"enableWebSearch,optional"`
 	ImageModel            string             `json:"imageModel,optional"`
 	ImageSize             string             `json:"imageSize,optional"`
+	ImageQuality          string             `json:"imageQuality,optional"`
+	ImageCount            int64              `json:"imageCount,optional"`
 	Mode                  string             `json:"mode,optional"`
 }
 
@@ -321,6 +323,8 @@ type CreateProjectRequest struct {
 	Prompt           string `json:"prompt,optional"`
 	ImageModel       string `json:"imageModel,optional"`
 	ImageSize        string `json:"imageSize,optional"`
+	ImageQuality     string `json:"imageQuality,optional"`
+	ImageCount       int64  `json:"imageCount,optional"`
 	EnableWebSearch  bool   `json:"enableWebSearch,optional"`
 	AllowEmptyPrompt bool   `json:"allowEmptyPrompt,optional"`
 }
@@ -397,11 +401,13 @@ type GenerateMockupModelRequest struct {
 }
 
 type GenerateRequest struct {
-	Id         string `path:"id"`
-	Prompt     string `json:"prompt"`
-	Mode       string `json:"mode,optional"`
-	ImageModel string `json:"imageModel,optional"`
-	ImageSize  string `json:"imageSize,optional"`
+	Id           string `path:"id"`
+	Prompt       string `json:"prompt"`
+	Mode         string `json:"mode,optional"`
+	ImageModel   string `json:"imageModel,optional"`
+	ImageSize    string `json:"imageSize,optional"`
+	ImageQuality string `json:"imageQuality,optional"`
+	ImageCount   int64  `json:"imageCount,optional"`
 }
 
 type GenerateResponse struct {
@@ -446,13 +452,14 @@ type GeneratorTaskDisableUnlimitedPrice struct {
 }
 
 type GeneratorTaskInputArgs struct {
-	AspectRatio string         `json:"aspect_ratio,optional"`
-	Image       []string       `json:"image,optional"`
-	ImageUrl    string         `json:"image_url,optional"`
-	Prompt      string         `json:"prompt,optional"`
-	Resolution  string         `json:"resolution,optional"`
-	SrcBox      *NormalizedBox `json:"src_box,omitempty,optional"`
-	DstBox      *NormalizedBox `json:"dst_box,omitempty,optional"`
+	AspectRatio  string         `json:"aspect_ratio,optional"`
+	Image        []string       `json:"image,optional"`
+	ImageUrl     string         `json:"image_url,optional"`
+	OutputFormat string         `json:"output_format,optional"`
+	Prompt       string         `json:"prompt,optional"`
+	Resolution   string         `json:"resolution,optional"`
+	SrcBox       *NormalizedBox `json:"src_box,omitempty,optional"`
+	DstBox       *NormalizedBox `json:"dst_box,omitempty,optional"`
 }
 
 type GeneratorTaskPriceDetail struct {