Monochrome image transformation

dodie / tracing-paper-sketching

Android App to copy images from the screen to physical paper.

MIT License

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Monochrome image transformation #61

Open dodie opened 5 years ago

dodie commented 5 years ago

Allow the loaded image to be turned into monochrome (grayscale). This might make tracing the image easier.

Goals:

when the user taps on the button, the loaded image should be presented in monochrome
a consequent tap would change the image to show it's original colors

Add the new button to the lower-left corner of the canvas, next to the mirror button (align the buttons vertically).

Once this is in place, there are several ideas on how to extend this. (#62, #87)

dodie commented 4 years ago

A previous attempt tried react-native-color-matrix-image-filters for image manipulation, but it seems that this library is not working with Expo, only if we eject the app which I'd rather not do for now.

For the future, expo-pixi might be a possible alternative. (Here's an article about it.)