Kinematic / Edit / Selections & masks

Select and mask anything.

Subject, sky, a color, a brightness or one moving object, found for you or drawn by hand, with edges that hold up.

Things to make

A clean cut-out with no colored halo, ready for any background.

Click Subject. The bears are found for you.
Pick Cut out to keep only them.
Clean edges swaps the misty backdrop color in the soft edge for the color of the fur.

InputImageFile→ImageMaskRefine→ImageMask→ImageEdgeDecontaminate+LocalAIImageRemoveBackground

Only the shadows lift. The street lights stay where they were.

InputImageFile→ImageThreshold→ImageMaskRefine→ImageRGBCurves

One box starts a selection that follows him. The room behind him blurs in and out.

Drag a box around the performer with Select > Object. It follows him through the clip.
Pick Select inverse to get the background.
Add Blur and drag an LFO onto its size.

InputVideoFile→ImageMaskRefine→ImageMaskRefine→ImageBlur+LocalAIImageToTrackedMask+ChannelDataLFO

A line wiped out of the sky, colors taken from an old painting, and a new sky placed inside the old one.

Paint out the line across the sky with Remove.
Match the colors to an old painting.
Select the sky, with its edge along the tree line, and place the new sky inside it.

InputImageFile→LocalAIImageInfill→ImageMaskRefine→ImageHistogramMatch→ImageComposite+LocalAIImageToSceneParsing

Only the tram changes color. The busy street around it stays as it was.

InputImageFile→ImageChromaKey→ImageMaskRefine→ImageHueSaturation

Light lands on the wall. The window panes and everything around it stay black.

Outline the wall with a polygon. Hold Ctrl and carve out the two panes.
Pick Select inverse and fill it black.
Bend it onto the curve with Grid warp and square it for the projector with Keystone.