Functional
Use utility pixel operations for inversion, thresholding, solarizing, posterizing, and replacing colour regions.
Choose a tool
Use Invert for a negative, Threshold for a black-and-white cutoff, Solarize for tone reversal, Posterize for fewer colour levels, or Color Replace for a targeted recolour.
In this section
Invert
Flip colour channels to their complements for negative, mask, and tone-inversion workflows.
Threshold
Split luminance into hard black-and-white regions at a chosen cutoff.
Solarize
Partially invert tones above a threshold for darkroom-style colour reversal.
Posterize
Reduce tonal and colour levels into flatter graphic bands.
Color Replace
Pick a source colour region and replace, shift, or recolour it with tolerance and feather controls.
Use it in the app
Open a project and find Layer → Filter → Functional in the effects picker. Choose the specific tool, then select its layer in Layers to open the Effect Panel. Related modes may share a mode dropdown at the top of that panel. The pages below explain source requirements, first adjustments and conditional controls for each tool.