A quick way to check color contrast in Aseprite (this extension is tested with version 1.3.14.3)

This extension inserts and removes a 'black layer with blendmode COLOR' over your entire timeline.
Something you could do yourself. But isn't it much quicker to just press one key? :-)

Easy Installation:

1. Go to menu Edit --> Preferences --> Extensions
2. Click 'Add Extension' and choose the downloaded ToggleGrayscale.zip
3. Restart Aseprite

Usage:

1. Under menu Sprite -> 'Toggle Grayscale'
2. Or assign a keyboard shortcut. Go to menu Edit --> Keyboard shortcuts --> Search for 'Toggle Grayscale' and assign e.g. key 'Y'

Example Timeline without overlay


Example Timeline with overlay




Use it via toolbar



Or assign a shortcut