How to achieve luminosity blend mode, and other questions

[vguenichon]

Ok well, the main question is how to achieve a luminosity blend mode ?
And the second question come with it : will it blend a jpg image and a svg image with a luminosity blend mode ?

For instance, I tried html2canvas and dom2img but none supports the background-blend-mode css property. So I want to give a chance to another solution : generating the background image first with camanjs.

Thanks for any help.