Three simple things to greatly improve colorization window

1. Increase the size of the image where we can set color points or allow us to zoom.

2. In the colorization window have access to useful color swatches to  use when setting color points.

3. Allow the sampling of colors from the colorized preview image so we can sample a color from the preview window and then use that color to set color points for missed or misinterpreted areas. For instance, if a person's body part has been missed being colorized properly, let us sample from an area that has been colorized properly and then add a color point to the missed part.