color correction is terrible

You seem to misunderstand what colour correction is in iMovie and any other editing app.

Most movies are composed of numerous clips which are only a few seconds long. 30 minutes is very unusual for one clip.

Let us say you have one clip about 10 seconds long. It may be too blue or too yellow. Colour correction will sort it out.

However, if you have been shooting continuously for half an hour there will be numerous colour variations.

Colour correction only works on one specific colour aberration and applies its setting to the entire clip.

Your only choice is to split a dodgy section of video into a separate clip and apply the colour correction to that section.

To separate the bad bit from the rest of the video place the playhead where the colour starts to be bad and press Command-B

Then do the same where the bad colour ends.

When you add color correction it applies to the entire clip, not just one frame. If you want to have different color settings apply to different portions of the clip, you must do a Modify/Split Clip before applying the color correction. Then you can apply different color correction settings to each split segment.

-- Rich

Hi, Ian,

I hadn't seen your posted response when I posted mine. Sorry for the slip up.

-- Rich

No problem, I often do it myself.

You only need to separate the bad bits. Of course if every few seconds there is a different colour cast it will take ages.