Harmy said:

So when you apply colourlike, it doesn't do it on a frame by frame comparison basis? I would have thought it would analyze each frame in the DVD and recolor the corresponding frame of the BD accordingly.

Oh how I wish that was the case!

Colourlike works this way: You specify two videos or images, it will then generate histograms as textfiles for both. Then you can use the plugin to do a conversion using those files.

You can also specify if you want it to create average histograms by scanning whole video clips, but it will take a long time if I remember correct.

This is the reason why g-force created RGBmatch, which can work frame by frame, but just like colourlike it works by balancing RGB. In many cases with films, RGBCMY have all been adjusted separately in hue, saturation and luminance, and there's no plugin that can automatically fix that.