Luminosity Masking Effect when Compositing

[thesoulkiller]

Question about an existing feature

What are you trying to achieve?

Hello,
I'm using the composite function to composite multiple layers into one. In photoshop I'm using one of the layers as a luminosity mask so that some lights occur more bright but it doesn't change any coloring or so.

I've looked into https://www.cairographics.org/operators/ and I've found that I should use CAIRO_OPERATOR_HSL_LUMINOSITY method to achieve luminosity masking.

Is there any ways to do this operation in .composite() function ?

Thanks in advance !

[lovell]

Hi, the non-separable blend modes are currently unsupported in libvips.

https://www.libvips.org/API/current/libvips-conversion.html#VipsBlendMode

[thesoulkiller]

Thank you, I've migrated to https://github.com/Automattic/node-canvas for this particular reason