This is a Houdini SOP node that lets you paint seamlessly on an image in the viewport.

Paint directly with the mouse or use geometry to define the strokes.

Create layers of different types:

Create shapes:

Create brushes:

Stroke shape outlines/between points using a pen or brush, or just paint on each point position.

See techie.gumroad.com/l/painter or techie.se for more info.

This is a Houdini SOP node that samples colors from an image or the screen.

Colors can be sampled by drawing on the image/screen or by using points on a line, a grid, randomly scattered points or with input points. It's also possible to sample the most frequently occurring (or dominant) colors.

The sampled colors are stored in a color ramp where they can be modified in various ways and can also be exported to an image or a JSON text file.

Download from techie.gumroad.com.

More info at techie.se.