Scrawl-canvas v8 - Filters test 037

Test various channel-alpha filters

To change image, drag-and-drop an image file over the canvas

Memoize filter

To note: Javascript is not running in this browser environment. The canvas element is ignored; instead a placeholder image displays where the canvas would have appeared.

Test purpose

Create a set of Picture entitys
Create filters and apply them to the test entitys

The filters applied to each Picture entity are as follows:

luminanceToAlpha
luminanceToAlpha → alphaToLuminance
channelsToAlpha → flood (to black)
channelsToAlpha → flood (to black) → alphaToChannels
gray
grayscale

Touch test: not required