Byakugan Visualizer
This is a color vision correction tool.
The Deuteranomaly and Protanomaly sliders control the strength of the correction. In this context, correction means that the image colors are adjusted to make color differences more distinguishable for people with color vision deficiencies.
I have a mix of deuteranomaly and protanomaly, which motivated me to create this tool. With the correction enabled, colorblind tests become much more solvable for me.
The correction formula comes from this paper by Jinmi Lee:
$$ \begin{bmatrix} R' \\ G' \\ B' \end{bmatrix} = \begin{bmatrix} 1 - \frac{\alpha_d}{2} & \frac{\alpha_d}{2} & 0 \\ \frac{\alpha_p}{2} & 1 - \frac{\alpha_p}{2} & 0 \\ \frac{\alpha_p}{4} & \frac{\alpha_d}{4} & 1 - \frac{\alpha_p + \alpha_d}{4} \end{bmatrix} \begin{bmatrix} R \\ G \\ B \end{bmatrix} $$
You can set $\alpha_d$ by adjusting the Deuteranomaly slider and $\alpha_p$ by adjusting the Protanomaly slider.