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(1) Note that there is no way for MagicHD to know whether the chosen frame is representative or useful!

(2) For example, MPEG-4 audio ﬁle format (.m4a) supports attached pictures.

Tip

Thumbnail regeneration can be forced from the menu.

5.1.7 Index Regeneration

If the media index ﬁle is missing MagicHD will automatically regenerate it from the media ﬁles in the show.

Note that all media will be included in the index. There is no way to mark a ﬁle as not part of the show, other than obscuring its

folder and/or ﬁle number (e.g. add _ or hide. at the start of the folder or ﬁle name).

If multiple ﬁles or folders have the same number, MagicHD will take the youngest one. This favours recently added or changed

media. The old media will still be there, but will not be in the index. This also means that if you make a mistake during conversion

or ﬁle copying, you will not lose any media (unless the ﬁle name is exactly the same).

Tip

Index regeneration can be forced from the menu.

5.2 Masks

A mask is simply an image whose intensity is used to control the brightness of some other media behind it. White areas are

totally opaque and black totally transparent. Shades of grey scale between the two. Any image can be used as a mask. Colour

is converted to transparency by taking the black & white intensity of the image. The simplest masks have just black and white

areas, and hide the layer (allowing lower layers to be seen) where they are black.

Each media layer can select a mask whose position is automatically synchronised with the media for that layer. As the layer is

scaled, positioned or rotated, the mask is too. This is the easiest way to use a masks.

Any media can be used as an independent mask by loading it as the media in its own layer. If the media has transparency, this

will reveal the layer below automatically. If you wish to control how the mask works, use the Mask colour effect.

Tip

Using a layer as a dedicated mask means that movies can be used as masks as well as images.

The output layer can select a mask which is applied over all the media layers. This can be used for static effects such as shuttering

or edge blending; or dynamic effects that apply to all layers at once.

Tip

For best results create your masks at the same resolution as your media, and use anti-aliasing to minimise visible pixellation

around curves etc.

5.2.1 Examples

If we look at one frame of video and a simple black & white arrow as a mask, the results are as follows:

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