Add more visual effects

[clabe45]

Add more effects. You can check the list of currently implemented effects in src/effect.js and then start with one of these:

• [x] Grayscale
• [ ] Saturation
• [ ] Invert
  • Inverts each color channel for each pixel
• [ ] Random noise (static)
  • Each pixel has a pseudorandom value for each color channel (rgb), whose seed the user can provide
• [ ] Simplex noise (smooth noise)
  • Each pixel samples a 2D simplex noise function, where the user provides the seed and the frequency
• [ ] Hue
  • Changes the hue
• [ ] Exposure
• [ ] Glow

[thefishgineer]

Hi, I can take this.

[clabe45]

Great!!

[clabe45]

@rc41186 I'm unsetting you as an assignee so other contributors don't think they can't help too