diff --git a/crates/processing_core/src/constants.rs b/crates/processing_core/src/constants.rs
index 3fb7ba0..443af6e 100644
--- a/crates/processing_core/src/constants.rs
+++ b/crates/processing_core/src/constants.rs
@@ -1,6 +1,7 @@
 pub const CORNER: &str = "corner";
 pub const CORNERS: &str = "corners";
 pub const RADIUS: &str = "radius";
+pub const DIAMETER: &str = CENTER; // ellipse_mode alias for CENTER
 pub const CENTER: &str = "center"; // also the middle mouse button
 
 pub const ROUND: &str = "round"; // caps and joins
@@ -46,8 +47,10 @@ pub const MIRROR: &str = "mirror";
 
 pub const SRGB: &str = "srgb";
 pub const LINEAR: &str = "linear"; // also the Sampler filter
+pub const RGB: &str = SRGB; // color_mode alias
 pub const HSL: &str = "hsl";
 pub const HSV: &str = "hsv";
+pub const HSB: &str = HSV; // color_mode alias
 pub const HWB: &str = "hwb";
 pub const OKLAB: &str = "oklab";
 pub const OKLCH: &str = "oklch";
@@ -134,10 +137,17 @@ pub const PI: f32 = std::f32::consts::PI;
 pub const TWO_PI: f32 = std::f32::consts::TAU;
 pub const HALF_PI: f32 = std::f32::consts::FRAC_PI_2;
 pub const QUARTER_PI: f32 = std::f32::consts::FRAC_PI_4;
+pub const THIRD_PI: f32 = std::f32::consts::FRAC_PI_3;
 pub const TAU: f32 = std::f32::consts::TAU;
 pub const DEG_TO_RAD: f32 = std::f32::consts::PI / 180.0;
 pub const RAD_TO_DEG: f32 = 180.0 / std::f32::consts::PI;
 
+pub const EPSILON: f32 = 0.0001;
+pub const MAX_FLOAT: f32 = f32::MAX;
+pub const MIN_FLOAT: f32 = -f32::MAX;
+pub const MAX_INT: i32 = i32::MAX;
+pub const MIN_INT: i32 = i32::MIN;
+
 // Key codes stay numeric (compared against `key_code`); values must match `key_code_to_u32`.
 
 pub const KEY_A: u32 = 65;
@@ -192,7 +202,9 @@ pub const BRACKET_RIGHT: u32 = 93;
 pub const BACKQUOTE: u32 = 96;
 
 pub const ESCAPE: u32 = 256;
+pub const ESC: u32 = ESCAPE;
 pub const ENTER: u32 = 257;
+pub const RETURN: u32 = ENTER;
 pub const TAB: u32 = 258;
 pub const BACKSPACE: u32 = 259;
 pub const INSERT: u32 = 260;
diff --git a/crates/processing_pyo3/src/constants.rs b/crates/processing_pyo3/src/constants.rs
index 99486f8..d576090 100644
--- a/crates/processing_pyo3/src/constants.rs
+++ b/crates/processing_pyo3/src/constants.rs
@@ -25,7 +25,7 @@ pub fn register(m: &Bound<'_, PyModule>) -> PyResult<()> {
         QUAD_STRIP,
         LINE_STRIP
     );
-    add!(m, CORNER, CORNERS, CENTER, RADIUS);
+    add!(m, CORNER, CORNERS, CENTER, RADIUS, DIAMETER);
     add!(m, OPEN, CHORD, PIE, CLOSE);
 
     m.add("INVERT", crate::filter::INVERT_U8)?;
@@ -43,7 +43,9 @@ pub fn register(m: &Bound<'_, PyModule>) -> PyResult<()> {
     add!(m, NORMAL, ITALIC, BOLD, BOLD_ITALIC);
     add!(m, WORD, CHAR);
     add!(m, NEAREST, CLAMP, REPEAT, MIRROR);
-    add!(m, SRGB, LINEAR, HSL, HSV, HWB, OKLAB, OKLCH, LAB, LCH, XYZ);
+    add!(
+        m, SRGB, RGB, LINEAR, HSL, HSV, HSB, HWB, OKLAB, OKLCH, LAB, LCH, XYZ
+    );
     add!(
         m,
         PBR_NEUTRAL,
@@ -56,8 +58,9 @@ pub fn register(m: &Bound<'_, PyModule>) -> PyResult<()> {
         SOMEWHAT_BORING_DISPLAY_TRANSFORM
     );
     add!(
-        m, PI, TWO_PI, HALF_PI, QUARTER_PI, TAU, DEG_TO_RAD, RAD_TO_DEG
+        m, PI, TWO_PI, HALF_PI, QUARTER_PI, THIRD_PI, TAU, DEG_TO_RAD, RAD_TO_DEG
     );
+    add!(m, EPSILON, MAX_FLOAT, MIN_FLOAT, MAX_INT, MIN_INT);
 
     add!(
         m, MAP, COMBINE, MIX, LOOKUP, REDUCE, EXTRACT, PACK, GENERATE
@@ -121,7 +124,9 @@ pub fn register(m: &Bound<'_, PyModule>) -> PyResult<()> {
     add!(
         m,
         ESCAPE,
+        ESC,
         ENTER,
+        RETURN,
         TAB,
         BACKSPACE,
         INSERT,