Add OVERLAY, HARD_LIGHT, SOFT_LIGHT blend modes to PImageTest by khuntvidisha13 · Pull Request #1463 · processing/processing4

What this PR does

Extends testAllBlendModesExactMatchStaticHelper in PImageTest.java
to include 3 missing blend modes:

• OVERLAY
• HARD_LIGHT
• SOFT_LIGHT

Why

These blend modes exist in PConstants but were not being tested.
All 3 modes now verified against PImage.blendColor() static helper.