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Understanding Opacity
ZS4 is based on a 32Bit RGB compositing engine. This means that every pixel (about a half-million per DV frame) is composed of 4x8Bits per pixel where 24 bits (the Red, Green and Blue values) indicate the actual color and the Remaining 8 Bits describe Transparency/Opacity. This article will go into some detail into the mechanics of Compositing with the use of opacity/transparency.
The Nature of a PixelA ZS4 pixel consists of 4 Components/Channels: Red, Green, Blue and Alpha. Each of these components/channels takes uses exactly 1 Byte (8 Bits) for its value. Together they take up 4 Bytes (32 Bits). One Byte can hold exactly 256 (2 to the power of 8) different values, so the actual value of Red, Green, Blue or Alpha can be anything from 0 to 255, including both, 0 and 255. Since the color is defined by only 3 elements of a pixel, the number of possible colors is limited by 3 x 8 = 24 Bits (~16 Million Colors, or 2^24 Colors). The 8 Bits remaining are "Opacity", the subject of this diatribe...From the users point of view the value of a pixel component/channel is between 0.0 and 1.0 which is internally translated to the range of 0 to 255. (a 64 bit pixel engine with channel values from 0 to 65535 can thus also be mapped to a range of 0.0 to 1.0 and thus be treated by the user in the same way the user treats a 32 bit pixel.) The function of the opacity value (0.0 to 1.0) is to make a pixel more opaque the higher the value is. A value of 0 means NOT opaque and 1.0 is totally opaque. The Nature of Video/Image CompositingIn the ZS4 process of video compositing one image is layered over top of the other applying the following rule:For each subsequent video signal which is overlayed, the alpha value of each pixel of that video signal will determine how opaque that pixel will be rendered. if the opacity is at 0, then the pixel will be not rendered at all. If that opacity is 1.0, then the newly overlayed pixel will completely cover up the pixel that was there before. if the opacity of a pixel is 0.5, then new resulting pixel will be an equal mix of the pixel that was there before and the pixel being overlayed. Bit Depth of FootageVideo footage, the stuff one imports into zweistein may come in different bit depths. A jpeg pixture typically is read as 24 bit image, with no alpha channel. because it is t@b and ijg software which loads jpeg images, they will always be visible in the mixer because t@b/ijg will make the assumtion that the opacity for all pixels in a jpeg image is 1.0. but in most cases in the windows operating system there is NO telling how much bits/pixel the footage actually has. ZS4 asks the microsoft system for 32 bits per pixel in all images so that, for example, motion png will be read properly while preserving stored opacities (alpha channel). Therefore it may become neccessary to adjust the opacity of an imported clip by setting an opacity value of 1, because the windows makes the false assumption that it is 0.Adjusting OpacityAn opacity adjuster ranges from -1.0 to +1.0 so that in one single "stroke" a video signal can be made completely transparent or completely opaque, regardless if the video was opaque or transparent to begin with. The opacity adjustment is in fact added to the opacity of every pixel in the frame.(the same approach is also used in color adjustment filters, where adjusters for Red, Green, Blue and Opacity will always range from -1.0 to +1.0 so that any target value from 0.0 to 1.0 can be achieved in one go...) The Difference between Source Opaquity and Output Opacity
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