# Blend Modes

Multiply day/night overlay + additive flash via Draw2D.

```{raw} html
<a class="example-run-button" href="../demos/features_2d_draw_blend.html">▶ Run in browser</a>

```

**Tags:** `2d`

Demonstrates the ``blend=`` keyword on the Draw2D colour ops:

* ``"multiply"`` (dst * src): a full-screen tint that darkens and colour-shifts
  the scene like a day/night cycle. A 50% grey multiply halves the scene; a
  blue-tinted multiply pushes it toward night.
* ``"add"`` (dst + src): an additive flash burst that brightens toward white,
  the standard glow / muzzle-flash / explosion idiom.
* ``"alpha"`` (default): the normal over-composited scene underneath.

The scene is a row of opaque sprites (coloured rects) painted with the default
alpha blend; the multiply overlay and additive flash are drawn on top in
submission order.


Controls:
  - SPACE triggers an additive flash
  - ESC quits

## Source

```{literalinclude} ../../examples/features/2d/draw_blend.py
:language: python
:linenos:
```