White as the blend colour produces no change. The darker the blend colour, the more intensely the colour will be applied in the base image. Colour Burnīlend mode increases the contrast to darken the base colour while reflecting the blend colour. Like how Multiply-fade will ignore the darkening caused by premultiplying, this blend mode will do the same with Alpha. This mode assumes that the alpha has not been premultiplied onto the RGB values and will not apply a correction to the semi-transparent pixels. This will ignore black created through premultiplying. Since maximum transparency is premultiplied, alpha results in black. The same as Multiply, but will make use of the alpha channel to calculate transparency in the source and blend layers. In order to make this work you have to use the same mapping on the layer set to mask and the layer on top. MaskĬhoose mask when you want to multiple out content upwards in the stack of layers, rather than downwards. White turns transparent, black takes precedence. Alpha is applied in the same fashion as the Over Blend mode. The result is always a darker image overall. For example: white x grey = 0.5. Reads the level of each subpixel as a level between 0.0 and 1.0, and multiplies source with blend. AddĪdds the value of each RGB pixel together. Brightness changes will make the layer more or less transparent. It will apply alpha values as a transparency if the alpha is present. Alpha = black, so adjusting the brightness of a layer in Over blend mode makes it darker. Premultipies all alpha onto the RGB value of each pixel. Here are expanations of what each individual blend mode will do. the result is our pixel at 255 RGB (full white) with 0 alpha would be calculated as a black pixel in the final image. Premultipled is the default output of Adobe Photoshop or AfterEffects. The more transparent something gets with premultiplied alpha, the closer it gets to black - as if the content is sitting on a black table. Premultiplied alpha takes the alpha and applies it to the values of the RGB channels per pixel. This is the preferable style of alpha and considering the cleaner method of the two. Internally generated content, such as gradient layer, are generated with straight alpha. For example, with straight alpha it is possible to have RGB = 255 (white) and alpha = 0 (fully transparent) on the same pixel. Alpha acts as a fourth channel of information per pixel which is as independent of the other three as R, G and B are of each other. Straight alpha is al alpha channel which functions just like RGB. There are two ways of expressing alpha in an image: Even when displaying a HAP video, the software will composite the layer with a controllable layer of alpha - one per layer. Layers are rendered in a bottom-up order: layers at the top can modify the output of the layers below.Ĭhanging brightness of a content layer in the disguise software is actually controlling the value of the alpha of the layer. BlendMode controls how the output of the layer is composited with the layers below.
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