How do I invert the colors of an image?
I'm using macOS 10.13 and I wish to use built-in Apple software or freeware.
Image Editing – How to Invert Colors of a Picture on Mac
image editing
Related Solutions
The best you can do in Pixelmator 1 is arcs using the oval selection tool. Select an area with the selection tool set to the circle/oval setting and then trace the selection (Edit -> Stroke) on a new layer. Once traced, erase the part of the trace you don't need. Reposition, stretch and mangle with the layer tools.
Pixelmator 2 adds vector drawing capabilities. It'll be available this summer and it will be a free upgrade for anyone who purchased Pixelmator 1 via the App Store.
Update: Pixelmator 2 was released via the App Store today and the pen tool lets you draw and manipulate curves now. Works great.
You could create a service like this with Automator:
It can't be used to for example edit an image embedded in a Pages document though.
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Best Answer
Swap the left-most and right-most points on the graph.