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Dirt Remover V1.0

Remove black and white spots from your video automatically

Dirt Remover eliminates dark and bright spots from your video and replace them with content taken from nearby frames. You can choose between the elimination of black, white or both types of spots at once. The rendered video is previewed in the canvas and you can also see it on a monitor hooked up to the DV connector (Firewire) of your Mac (additional DV converter needed if your monitor does no directly support Firewire connection).

Dirt Remover looks at nearby frames to find out if a certain spot is really a dirt-spot or a freckle or a moving object. If a spot has been identified, it will be replaced by the content from the last or the next frame or a combination of both. Therefore Dirt Remover creates a mask where all identified spots can be seen. You can preview the mask in the canvas.

There are three modes for the canvas:

Mode: Original

The canvas shows you the unchanged footage. This very useful to see if you have used good settings that only took care of the dirt. In this case we can see a video with some dark spots within this frame.
Mode: Removed Dirt (Mask)

Here we see the spots taken from the video. This will be used as a mask for the replacement with content from nearby frames.
Mode: Final

The canvas shows the actual rendered footage. You don't need to switch to this setting if you want to render the image. For the final render process Dirt Remover automatically switches to this option.


Take
This popup is used to tell Dirt Remover which frames should be used to overlay onto the areas where spots have been detected.

The option Last and next frame 50/50 will add up the previous and the next frame. This option is the best way to be sure to remove a spot completely by original content. If i.e. the video changes its brightness during that time, the 50/50 option adds up the surrounding frames and so creates a frame that carries the exact brightness that got lost by the unwanted spot.


Type
Use this popup to determine if you want to remove black or white spots or both at once.

Dirt Size
Here you can fix the maximum size of the spots you want to have removed. Only spots smaller than the given size will go away. All other spots will stay. This value is most important. Try to imagine the following: You have a very fast moving video where the content changes rapidly. A hand appears for only three frames. In the first frame the hand is visible on the left side of the video, in the second frame in the center and in the third frame on the right side. Dirt Remover must now determine if the hand in those frames is really some content that should stay or a spot that needs to be removed. This is done by telling Dirt Remover the maximum size of a spot. Usually such a fast moving object is way bigger than a spot you want to get rid of. By setting the Dirt Size slider to the maximum size of the spots, you can ensure that only spots will be removed and such a fast moving hand will stay where it is.


Motion Tolerance
In order to get a good grip on real spots, Dirt Remover has to take a good look at the video. It is very easy for Dirt Remover to see where a spot appears if there is no motion in the video. But if the video has a very fast motion, it is quite complicated to figure out if a specific object is a spot or just a fast moving freckle. This is why there is the Motion Tolerance control. The higher you set this value, the less Dirt Remover will take care of the motion of the objects in the video and it is possible that some objects will be removed. Make sure not to set this value too high. Values between 1 and 40 are good in most cases.


Dirt Brightness Range
Dirt does not always look the same. In addition each video might have a different black and white level. Use these two controls Low and High to tell Dirt Remover the brightness range of the video. Don't narrow the brightness range too much. Dirt Remover needs to have a chance to look at the whole video. A too narrow range is contra productive and should be avoided.


Important:
- Dirt Remover will not be able to find the spots anymore, if the speed of the video has been changed. Please make sure to remove the spots first, before you change the speed.


Feather Mask
This additional control might help in some cases when you get borders around the repaired spots. With this control you can feather the mask in order to eliminate those borders.

Some Hints:
- It is important that spots are visible for one frame only. Spots that are visible for longer than one frame, will not be considered as a spot and wont be removed.

- If you experience very big spots or damages in your video, you might want to use either Dead Pixel or Dropout Eliminator to repair them.


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