fix substract blending and preview size

Unity/Assets/Editor/Scripts/PropertyDrawers/NonTriInspector/Attributes/VFXComponentImagePreview.cs

@@ -11,11 +11,15 @@ public class VFXComponentImagePreview : PropertyDrawer
 
         public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
         {
-            // TODO: this is not ideal
+            if (property.propertyType != SerializedPropertyType.ObjectReference) return;
             image = (Texture) property.objectReferenceValue;
-            GUIStyle style = new(EditorStyles.label);
-            style.alignment = TextAnchor.UpperCenter;
-            GUILayout.Box(image, style);
+            if (!image) return;
+
+            GUIStyle style = new(EditorStyles.label)
+            {
+                alignment = TextAnchor.UpperCenter,
+            };
+            GUILayout.Label(image, style, GUILayout.MaxHeight(200f));
         }
     }
 }

Unity/Assets/Mod/VFX/Color Tint/ColorTint_shader.shader

@@ -201,7 +201,7 @@
             fixed4 frag (v2f i) : SV_Target
             {
                 fixed4 col = tex2D(_MainTex, i.uv);
-                return lerp(col, _Color - col, _Color.w);
+                return half4(lerp(col.rgb, col.rgb - _Color.rgb, _Color.w), col.a);
             }
             ENDCG
         }

Unity/Assets/Mod/VFX/Image Overlay/ImageOverlay_shader.shader

@@ -300,7 +300,7 @@
 
                 fixed4 col = tex2D(_MainTex, i.uv);
 
-                return lerp(col, col - image, image.w * _Strength);
+                return half4(lerp(col.rgb, col.rgb - image.rgb, image.w * _Strength), col.a);
             }
             ENDCG
         }