diff --git a/backend/internal/app/creation.go b/backend/internal/app/creation.go
index 6548d37ff..d1abbe7e0 100644
--- a/backend/internal/app/creation.go
+++ b/backend/internal/app/creation.go
@@ -524,7 +524,20 @@ func validateCreationSubmissionScope(run *model.CreationRun, version int64, req
 			if key == "videoSeconds" {
 				metadataKey = "seconds"
 			}
-			if approved := stringValue(meta[metadataKey]); approved != "" && approved != stringValue(config[key]) {
+			approved := strings.TrimSpace(stringValue(meta[metadataKey]))
+			candidate := strings.TrimSpace(stringValue(config[key]))
+			if metadataKey == "quality" {
+				approvedNorm := strings.ToLower(approved)
+				candidateNorm := strings.ToLower(candidate)
+				// auto/any 与空缺在图片生成中等价，前端 omittedImageQuality 可能会省略默认 quality
+				if (approvedNorm == "auto" || approvedNorm == "any" || approvedNorm == "") && (candidateNorm == "auto" || candidateNorm == "any" || candidateNorm == "") {
+					continue
+				}
+				if approvedNorm == candidateNorm {
+					continue
+				}
+			}
+			if approved != "" && approved != candidate {
 				return creationConflict("生成规格与已批准方案不同")
 			}
 		}
diff --git a/backend/internal/app/task_creation.go b/backend/internal/app/task_creation.go
index 2f04632e6..be2a517ff 100644
--- a/backend/internal/app/task_creation.go
+++ b/backend/internal/app/task_creation.go
@@ -388,7 +388,28 @@ func (s *Service) resolveSystemChannelModelSelection(input map[string]any, taskT
 		}
 	}
 
-	priceTier := channelModelPriceTierForIntent(*channelModel, intent)
+	pricingIntent := intent
+	if normalizeCapability(channelModel.Capability) == "image" {
+		pricingOptions := make(map[string]any, len(intent.Options)+2)
+		for k, v := range intent.Options {
+			pricingOptions[k] = v
+		}
+		rawQuality := strings.ToLower(strings.TrimSpace(fmt.Sprint(nextConfig["quality"])))
+		if rawQuality != "" && rawQuality != "<nil>" && rawQuality != "auto" && rawQuality != "any" {
+			pricingOptions["quality"] = rawQuality
+		} else if pricingOptions["quality"] == nil || pricingOptions["quality"] == "" || pricingOptions["quality"] == "auto" {
+			pricingOptions["quality"] = "1k"
+		}
+		if rawSize := strings.ToLower(strings.TrimSpace(fmt.Sprint(nextConfig["size"]))); rawSize != "" && rawSize != "<nil>" && rawSize != "auto" {
+			pricingOptions["size"] = rawSize
+		}
+		pricingIntent.Options = pricingOptions
+	}
+
+	priceTier := channelModelPriceTierForIntent(*channelModel, pricingIntent)
+	if priceTier == nil {
+		priceTier = channelModelPriceTierForIntent(*channelModel, intent)
+	}
 	if priceTier == nil || !ValidatePriceTierPrice(priceTier, channelModel.Capability, channelModel.Protocol) {
 		return input, ModelPriceNotConfigured("指定的模型未配置当前规格的有效价格")
 	}
diff --git a/backend/internal/app/task_creation_test.go b/backend/internal/app/task_creation_test.go
index 31d347f3a..421502c93 100644
--- a/backend/internal/app/task_creation_test.go
+++ b/backend/internal/app/task_creation_test.go
@@ -319,3 +319,56 @@ func newSelectionPriceTier(id string, selector string, providerModelKey string,
 		BillingMode: billingMode, UnitPriceMicrocredits: 10, PriceConfigured: true, Enabled: true,
 	}
 }
+
+func TestImageResolutionPricingOnSystemChannel(t *testing.T) {
+	profile := DefaultModelCapabilityConfigForModel(string(model.ChannelInterfaceGeminiImage), "gemini-image-model")
+	profile.Image.Quality = ImageQualityConfig{Supported: false, Default: "auto"}
+	profile.Image.Size = ImageSizeConfig{
+		Parameter: "aspect_ratio",
+		Values:    []string{"1:1", "16:9"},
+		Default:   "1:1",
+		Presets: []ImageSizePreset{
+			{Tier: "1k", Ratio: "16:9", Size: "1824x1024", Width: 1824, Height: 1024},
+			{Tier: "2k", Ratio: "16:9", Size: "2752x1536", Width: 2752, Height: 1536},
+			{Tier: "4k", Ratio: "16:9", Size: "3840x2160", Width: 3840, Height: 2160},
+		},
+	}
+	svc, _, channel, channelModel := createSystemChannelSelectionFixture(t, "image", model.ChannelInterfaceGeminiImage, profile, []model.ChannelModelPriceTier{
+		newSelectionPriceTier("tier-1k", `{"quality":"1k"}`, "provider-1k", "fixed_request"),
+		newSelectionPriceTier("tier-2k", `{"quality":"2k"}`, "provider-2k", "fixed_request"),
+		newSelectionPriceTier("tier-4k", `{"quality":"4k"}`, "provider-4k", "fixed_request"),
+	})
+
+	for _, tc := range []struct {
+		name     string
+		quality  string
+		size     string
+		wantTier string
+	}{
+		{"1k specified", "1k", "16:9", "tier-1k"},
+		{"2k specified", "2k", "16:9", "tier-2k"},
+		{"4k specified", "4k", "16:9", "tier-4k"},
+		{"auto specified", "auto", "16:9", "tier-1k"},
+		{"empty specified", "", "16:9", "tier-1k"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			input := map[string]any{
+				"mode": "image",
+				"config": map[string]any{
+					"channelId": channel.ID,
+					"model":     channelModel.ModelKey,
+					"size":      tc.size,
+					"quality":   tc.quality,
+				},
+			}
+			resolved, err := svc.resolveSystemChannelModelSelection(input, "canvas_image", "")
+			if err != nil {
+				t.Fatalf("resolve error: %v", err)
+			}
+			cfg := resolved["config"].(map[string]any)
+			if cfg["priceTierId"] != tc.wantTier {
+				t.Fatalf("priceTierId = %#v, want %s", cfg["priceTierId"], tc.wantTier)
+			}
+		})
+	}
+}