alexfu

public class ColorUtils {
  private static final double LM_RED_COEFFICIENT = 0.2126;
  private static final double LM_GREEN_COEFFICIENT = 0.7152;
  private static final double LM_BLUE_COEFFICIENT = 0.0722;

  public static int calculateRelativeLuminance(int color) {
    int red = (int) (Color.red(color) * LM_RED_COEFFICIENT);
    int green = (int) (Color.green(color) * LM_GREEN_COEFFICIENT);
    int blue = (int) (Color.blue(color) * LM_BLUE_COEFFICIENT);
    return red + green + blue;

mikeygee

<!-- using the truncate filter -->
{% for post in site.posts limit:10 %}
   <h2><a href="{{ post.url }}">{{ post.title }}</a></h2>
   <span class="post-date">{{ post.date | date: "%B %d, %Y" }}</span>
   {% if post.content.size > 2000 %}
      {{ post.content | truncatewords: 300 }} <!-- bad! content gives you rendered html and you will truncate in the middle of a node -->
      <a href="{{ post.url }}">read more</a>
   {% else %}
      {{ post.content }}
   {% endif %}