diff --git a/server-rs/crates/platform-image/src/vector_engine/constants.rs b/server-rs/crates/platform-image/src/vector_engine/constants.rs
index 6480fba73..2ae789387 100644
--- a/server-rs/crates/platform-image/src/vector_engine/constants.rs
+++ b/server-rs/crates/platform-image/src/vector_engine/constants.rs
@@ -5,3 +5,7 @@ pub const VECTOR_ENGINE_GPT_IMAGE_2_MODEL: &str = GPT_IMAGE_2_MODEL;
 pub const VECTOR_ENGINE_PROVIDER: &str = "vector-engine";
 pub const VECTOR_ENGINE_IMAGE_EDIT_MAX_REFERENCE_IMAGES: usize = 5;
 pub const VECTOR_ENGINE_NANOBANANA_MAX_REFERENCE_IMAGES: usize = 14;
+pub const GPT_IMAGE_2_MIN_PIXELS: u64 = 655_360;
+pub const GPT_IMAGE_2_MAX_PIXELS: u64 = 8_294_400;
+pub const GPT_IMAGE_2_MAX_EDGE: u32 = 3_840;
+pub const GPT_IMAGE_2_DIMENSION_ALIGNMENT: u32 = 16;
diff --git a/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs b/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
index 6061f885b..6731432d9 100644
--- a/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
+++ b/server-rs/crates/platform-image/src/vector_engine/raw_edit.rs
@@ -7,7 +7,10 @@ use serde::Deserialize;
 use super::{
     audit::build_failure_audit,
     budget::{effective_request_timeout_ms, request_budget_exhausted_error},
-    constants::{GPT_IMAGE_2_MODEL, VECTOR_ENGINE_PROVIDER},
+    constants::{
+        GPT_IMAGE_2_DIMENSION_ALIGNMENT, GPT_IMAGE_2_MAX_EDGE, GPT_IMAGE_2_MAX_PIXELS,
+        GPT_IMAGE_2_MIN_PIXELS, GPT_IMAGE_2_MODEL, VECTOR_ENGINE_PROVIDER,
+    },
     error::PlatformImageError,
     request::vector_engine_images_edit_url,
     types::VectorEngineImageSettings,
@@ -38,11 +41,6 @@ pub struct RawImageEditResult {
     pub b64_images: Vec<String>,
 }
 
-const GPT_IMAGE_2_MIN_PIXELS: u64 = 655_360;
-const GPT_IMAGE_2_MAX_PIXELS: u64 = 8_294_400;
-const GPT_IMAGE_2_MAX_EDGE: u32 = 3_840;
-const GPT_IMAGE_2_DIMENSION_ALIGNMENT: u32 = 16;
-
 #[derive(Debug, Deserialize)]
 struct RawImageEditResponsePayload {
     data: Vec<RawImageEditResponseEntry>,
diff --git a/server-rs/crates/platform-image/src/vector_engine/request.rs b/server-rs/crates/platform-image/src/vector_engine/request.rs
index af232dbc8..0b008d2a2 100644
--- a/server-rs/crates/platform-image/src/vector_engine/request.rs
+++ b/server-rs/crates/platform-image/src/vector_engine/request.rs
@@ -1,7 +1,10 @@
 use serde_json::{Map, Value, json};
 
 use super::{
-    constants::{GPT_IMAGE_2_C_MODEL, GPT_IMAGE_2_MODEL},
+    constants::{
+        GPT_IMAGE_2_C_MODEL, GPT_IMAGE_2_DIMENSION_ALIGNMENT, GPT_IMAGE_2_MAX_EDGE,
+        GPT_IMAGE_2_MAX_PIXELS, GPT_IMAGE_2_MIN_PIXELS, GPT_IMAGE_2_MODEL,
+    },
     types::{ReferenceImage, VectorEngineImageSettings},
 };
 
@@ -129,10 +132,6 @@ fn normalize_explicit_pixel_size(value: &str) -> String {
 }
 
 fn clamp_gpt_image_2_pixel_size(size: &str) -> String {
-    const MIN_PIXELS: u64 = 655_360;
-    const MAX_PIXELS: u64 = 8_294_400;
-    const MAX_EDGE: u32 = 3_840;
-    const DIMENSION_ALIGNMENT: u32 = 16;
     const MAX_ASPECT_RATIO: f64 = 3.0;
 
     // 中文注释：这里是 VectorEngine 的共享发送边界，只处理 gpt-image-2 的显式像素尺寸。
@@ -154,31 +153,31 @@ fn clamp_gpt_image_2_pixel_size(size: &str) -> String {
 
     let pixels = width * height;
     // 中文注释：等比缩小，优先保留已收紧后的画面比例，同时满足最大边和最大总像素。
-    let scale = (MAX_EDGE as f64 / width.max(height))
-        .min((MAX_PIXELS as f64 / pixels).sqrt())
+    let scale = (GPT_IMAGE_2_MAX_EDGE as f64 / width.max(height))
+        .min((GPT_IMAGE_2_MAX_PIXELS as f64 / pixels).sqrt())
         .min(1.0);
     width *= scale;
     height *= scale;
 
     let pixels = width * height;
     // 中文注释：小于最小总像素时等比放大；此前已处理比例，放大不会重新突破 3:1。
-    if pixels < MIN_PIXELS as f64 {
-        let scale = (MIN_PIXELS as f64 / pixels).sqrt();
+    if pixels < GPT_IMAGE_2_MIN_PIXELS as f64 {
+        let scale = (GPT_IMAGE_2_MIN_PIXELS as f64 / pixels).sqrt();
         width *= scale;
         height *= scale;
     }
 
     // 中文注释：provider 要求两边均为 16px 倍数，向上取整避免对齐后落到最小像素以下。
-    let width = align_dimension_up(width, DIMENSION_ALIGNMENT);
-    let height = align_dimension_up(height, DIMENSION_ALIGNMENT);
+    let width = align_dimension_up(width, GPT_IMAGE_2_DIMENSION_ALIGNMENT);
+    let height = align_dimension_up(height, GPT_IMAGE_2_DIMENSION_ALIGNMENT);
     // TODO unlikely but can improve
     // 中文注释：对齐可能触碰最大边或最大像素，因此发送前重新核验全部约束。
     if is_valid_gpt_image_2_size(
         width,
         height,
-        MIN_PIXELS,
-        MAX_PIXELS,
-        MAX_EDGE,
+        GPT_IMAGE_2_MIN_PIXELS,
+        GPT_IMAGE_2_MAX_PIXELS,
+        GPT_IMAGE_2_MAX_EDGE,
         MAX_ASPECT_RATIO,
     ) {
         return format!("{width}x{height}");