Archive:Kdenlive/Manual/Effects/Alpha manipulation/Alpha shapes/uk

Прозорі форми

Це фільтр Frei0r alphaspot

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Скористайтеся цим у поєднанні із композитним переходом, щоб розташувати області прозорості на кліпі-накладці так, щоб кліп під ним було видно крізь області, які визначено певними геометричними формами. Типово, область прозорості буде розташовано ззовні від форми, яку ви намалюєте. Всередині форми буде розташовано область непрозорості, де буде видно вміст кліпу-накладки.

Параметри форми

This controls the shape of the area of opacity that the effect will create.

Shape options are Rectangle, Ellipse, Triangle Diamond.

Tilt

This controls the angle the shape appears on the screen. The units are in 1000ths of a full rotation. eg a factor of 250 is one quarter of a circle turn and 500 is a 180 turn. ie 1000 tilt units = 360 degrees

Position X and Y

This defines the position of the shape on the screen

Size X and Y

Defines the size of the shape

Transition Width

Defines the width of a border on the shape where the transparency grades from inside to outside the shape

Обробка

Operations define what is to happen when you have more than one Alpha effect on the clip.

Operations are Write On Clear, Max, Min, Add, Subtract.

• Write On Clear = existing alpha mask is overwritten

• Max = maximum( existing alpha mask, mask generated by this filter)

• Min = minimum(existing alpha mask, mask generated by this filter)

• Add = existing alpha mask + mask generated by this filter

• Subtract = existing alpha mask - mask generated by this filter

See the worked examples below to understand what these operations do.

Min and Max and Operations - Worked examples

These examples are performed on a simple composite transition with a video file on Video track 1 and a color clip (yellow) on Video track 2.

Alpha shapes effect draws areas of opacity onto the image. The addition of this filter (with the default settings of Min = 0 and Max =1000) makes the whole frame transparent except for an area of opaqueness where the top image can be seen.

The Max and Min controls adjust the opacity of the image inside and outside of the shape respectively. A setting of 1000 is 100% opaque. A setting of zero is 0 % Opaque (ie 100% Transparent).

Max control

The Max control regulates how opaque it is inside the shape. At Max= 1000 it is completely opaque inside the shape and none of the background image shows through

At Max = 500 it is semi transparent inside the shape and you can see the background bleeding through.

At Max = 0 inside the shape is completely transparent - the same as the rest of the foreground image - and you can see all background.

Min Control

The Min control adjusts how opaque it is outside the shape. When Min = 0 outside the shape is completely transparent (opacity of zero) and at Min = 500 we see some of the foreground appear outside the shape.

At Min = 1000 the opacity outside the shape is 100% and none of the background appears.

Combining Alpha Shapes - Operations

In this example I have a Triangle Alpha shape defined as shown and this is at the top of the effect stack with operation write on clear

Which appears like this on its own

And I have rectangle alpha shape as shown which is at the bottom of the effect stack. Note the Max = 500 - i.e. 50% opacity inside the rectangle

Which appears like this when on its own.

In the images below I demonstrate the effect of different alpha operations on the rectangle alpha shape.

Write on Clear - existing alpha mask is overwritten

додати = наявна маска прозорості + маска, яку створено цим фільтром.

Note that areas with 1000 + 500 opacity would be 150% opaque. But you cant get 150% opaque so they look the same as the 100% opaque areas

subtract = existing alpha mask - mask generated by this filter

Note that areas with 0 - 500 opacity would be minus 50% opaque. But you cant get -50% opaque so they look the same as the 0% opaque areas

максимум = максимум( <наявна маска прозорості> , <маска, яку створено цим фільтром>)

мінімум = мінімум( <наявна маска прозорості> , <маска, яку створено цим фільтром>)

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