HansMuller

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

class Destination {
  const Destination(this.index, this.title, this.icon, this.color);
  final int index;
  final String title;
  final IconData icon;
  final MaterialColor color;
}

lopspower

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

JBed

#PCA whitening involves finding the inverse square root of the covariance matrix 
#of a set of observations, which is prohibitively expensive when dealing 
#with natural images 

#starting with a path to a single image (img_path)
import numpy as np
from PIL import Image
from sklearn import preprocessing