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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| ``` | ||
| ______ __ ______ __ __ ______ | ||
| /\ __ \ /\ \ /\ == \ /\ \_\ \ /\ __ \ | ||
| \ \ __ \ \ \ \____ \ \ _-/ \ \ __ \ \ \ __ \ | ||
| \ \_\ \_\ \ \_____\ \ \_\ \ \_\ \_\ \ \_\ \_\ | ||
| \/_/\/_/ \/_____/ \/_/ \/_/\/_/ \/_/\/_/ | ||
| ______ __ __ ______ __ __ __ __ ______ __ | ||
| /\ ___\ /\ \_\ \ /\ __ \ /\ "-.\ \ /\ "-.\ \ /\ ___\ /\ \ | ||
| \ \ \____ \ \ __ \ \ \ __ \ \ \ \-. \ \ \ \-. \ \ \ __\ \ \ \____ | ||
| \ \_____\ \ \_\ \_\ \ \_\ \_\ \ \_\\"\_\ \ \_\\"\_\ \ \_____\ \ \_____\ | ||
| \/_____/ \/_/\/_/ \/_/\/_/ \/_/ \/_/ \/_/ \/_/ \/_____/ \/_____/ | ||
| in veejay | ||
| ``` | ||
| **Veejay has some support for alpha channel compositing** | ||
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| In general, you will need to add an alpha channel to your playing sample or | ||
| stream by using one of the "Alpha:" filters in veejay. | ||
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| Then, the alpha channel will be combined used FX that can deal with Alpha. Some | ||
| effects have a mode parameter `Alpha` that functions like an on/off switch but | ||
| others require an extra alpha channel to work. | ||
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| By default, the alpha channel is set to `0` (completely invisible) so such effects | ||
| will always result in a black screen if you have not added an alpha channel. | ||
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| In Reloaded, you can toggle the white button next to 'Alpha Clear' to switch | ||
| between `0` (completely invisible) and `255` (completely visible) | ||
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| Also, you can toggle the alpha-button to set the fade method to alpha blending | ||
| in the (manual) chain fader | ||
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| The chain fader fades the original (unchanged) image to the image that is rendered | ||
| by the FX chain, either with an opacity value or by using alpha channel information | ||
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| In Reloaded, the chain fader is located next to the FX chain (the vertical slider). | ||
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| _Alpha compositing is still in development and feedback is of course welcome_ | ||
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| List of "Alpha:" FX | ||
| ------------------- | ||
| * **The 'Set by Color Key' operator** | ||
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| Use this filter to create an alpha channel from the foreground object. | ||
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| The filter requires an existing alpha channel to decide which pixel from source B to composite in. Pixels with an alpha of `0` are skipped. | ||
| Using the parameters `R,G,B` and `Angle` you can select which pixels belong to the background and key them out, leaving a mask of the foreground object. | ||
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| * **The 'Select by Chroma Key' operator** | ||
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| Use this filter to create an alpha channel from the foreground object. | ||
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| The filter may use an existing alpha channel to decide which pixel from source B to composite in. Pixels with an alpha of `0` are skipped optionally. | ||
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| * **Luma Key** | ||
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| Luma Key in `Mode 3` will composite-in pixels from source B using its alpha channel | ||
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| * **Alpha Blend** | ||
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| Image in source B will be blended on top of source A using its alpha channel | ||
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| * **Black and White Mask by Threshold** | ||
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| This filter creates a black/white image from a minimum and maximum threshold value. | ||
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| You can set a `Mode` parameter so that the render result is written as an Alpha channel | ||
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| * **LVD Scale0Tilt / Crop,Scale,Tilt** | ||
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| This filter is a port of the [frei0r](https://frei0r.dyne.org/) filter "scale0tilt.so" | ||
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| You can use it to crop, scale, tilt an image from source B over source A | ||
| If the `Alpha` paramater is set to `1`, the final result will be an opaque pixel with the transparency of each pixel determined by the alpha channel values | ||
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| * **Flatten Image** | ||
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| Use this to multiply the alpha channel against a black background | ||
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| * **Alpha Fill** | ||
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| Solid value fill of the alpha channel into `0 - 255` range | ||
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| * **Set from Image / Mixing source** | ||
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| Use the luminance channel of the image as a new Alpha channel | ||
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| You can use the FX switch parameter to scale the values to full range `0 - 255` if needed. | ||
| If you have no result in the Alpha channel, flip this parameter. | ||
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| * **Alpha to Greyscale** | ||
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| Use this FX to display the alpha channel as a greyscale image. | ||
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| * **Transition Map** | ||
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| Use this FX to blend over time using a greyscale image as an opacity map |
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