Simple canvas-based color converter

## README.md

      
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              njvack
            / README.md
          
          
            Last active Nov 10, 2015
          
          
            Color to hex and rgba converter
          
        
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    Simple canvas-based color converter

To answer this StackOverflow question I wrote this — a small solution based on a never-rendered <canvas> element. It fills a 1-pixel canvas with the provided fill-style, and then reads the RGBA values of that pixel. It will work with any CSS color -- name, rgba(), hex, or even something more exotic like a gradient or pattern. Invalid colors are always returned as transparent black. Transparent colors are treated as painted on a newly-cleared canvas.

It's been tested in modern-ish versions of IE, Chrome, Safari, and Firefox. The API is:

color_convert.to_hex(color)   # Converts color to a hex-based RGB triple; to_hex('red') returns '#ff0000'
color_convert.to_rgba(color)  # Converts color to an rgba() string; to_rgba('red') returns 'rgba(255,0,0,1)'


## A Slicing Thing.ipynb

      
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              njvack
            / A Slicing Thing.ipynb
          
          
            Created Mar 13, 2015
          
          
            A Slicing Notebook
          
        
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## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
  font: 300 11px "Helvetica Neue", Helvetica, Arial, sans-serif;
  fill: #bbb;
}

.node:hover {

## coins_login.rb
#!/usr/bin/env ruby

require 'mechanize'
require 'pp'

def coins_login(agent, username, password)
  page = agent.get "https://chronus.mrn.org/cas/login.php?rp=https%3A%2F%2Fchronus.mrn.org%2Fmicis%2Findex.php%3Fsubsite%3Dasmt"
  uname_match = page.body.match /name="([^"]+)" placeholder="Username/
  uname_field = uname_match[1]
  pw_match = page.body.match /name="([^"]+)" placeholder="Pa\$\$w0rd/

## upload_gating_files
#!/bin/bash

GATING_DIR=${GATING_DIR:-/usr/g/service/log/gating}
DEST_BASE=${DEST_BASE:-/mri-upload/ge_physio}
MAX_AGE_MINUTES=${3:-120}

study=$1
ppt=$2

if [[ "${study}" == "" ]] || [[ "${ppt}" == "" ]] || [[ "${study}" == "-h" ]]; then

## link_tree
#!/bin/bash

in_path=$1

if [[ "$in_path" == "" ]] || [[ "$in_path" == "-h" ]]; then
    cat <<USAGE
Usage: link_tree PATH [--dry-run]

Finds every symbolic link in PATH/subdirectory** and creates links to them in
/subdirectory**

## seba-vid-extend.rb
#!/usr/bin/env ruby
require 'tmpdir'
require 'fileutils'

fix_file = ARGV[0]
vid_file = ARGV[1]
out_file = ARGV[2]

FIXATION_FRAMES=10
VID_FRAMES=25

## convert_tarred_dicoms
#!/bin/bash

in_file="$1"
out_file="$2"

out_base=$(dirname "${out_file}")

tmp_dir=$(mktemp -d -p "${out_base}")
if [ $? -ne 0 ]; then
    echo "Can't make a temporary directory in ${out_base}" >&2

## mask_scramble.py
#!/usr/bin/env python
import sys
import argparse

from PIL import Image
import numpy as np


def scramble_ary(img_ar, mask_ar):
    """

## index.html
<!DOCTYPE html>
<html>
<head>
  <title>Circley</title>
  <style type="text/css">
    body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 960px;
  height: 500px;
  position: relative;