- The ability to interrupt the polygonal lasso drawing process with the spacebar Grabber shortcut, to pan the document, without losing where you were in the selection making process.
- The ability to fill with the Paint Bucket Tolerance inside of an active selection.
- Proper anti-aliasing of Oval selections.
After that, my next favorite features are:
- The improvements made to the core Drip and Liquid brush technologies to finally allow them to work on layers and blend with transparency -- as a result, these brush technologies are now among my favorites in Painter.
- The new Selections Brushes features of the brush engine -- quite a bit of power here for creating selections in the style of Photoshop's Quick Mask tool... though IMO these selection brushes present an even better workflow.
- Thick Paint -- this is a new Oil/Acrylic paint brush technology (supported by a new specialty layer system), similar to Liquid Ink in the ideas that it has surface tension and Impasto-type controls which are tied into a unique layer.
For those who are interested, I was involved in the creation of a number of brushes that ship with Painter 2018:
Painter 2018 Brushes library:
Thick Paint> Grainy Loaded Palette Knife
Thick Paint> Grainy Real Bristle Oils Flat
Thick Paint> Grainy Real Bristle Oils Round
Selection Brushes> Comic Flatting
Sargent> Real Bristle Soft
Texture Cover> Stencil Emboss 2.5D
Texture Source Blending> Stencil Soft Emboss 2.5D
Natural Media Brushes library:
HARD MEDIA - Conte> All
INK - Markers> All
INK - Pens> All
REFINING - Blenders> Everything but the Just Add Water variant
You can download a set of Thick Paint variants I created here --these are variations on the major themes and some may work better than others for your particular needs.