Primary / Secondary / Grayscale / Custom - colors that replace the source color. Replace RGB with Color - color selection: Invert Alpha values - switch between alpha and color. is define the thresholds for changing the Alpha value. YCbCr, YUV - by perceived pixel brightness. RGB - by the maximum value of R, G, or B. Pixels with brightness in the range between the lower and upper limits get alpha set to a value between 0 and 255 depending on their brightness.Ĭolor Model - a way to estimate the brightness of a pixel: Pixels with brightness more the upper limit get alpha set to 255 (fully opaque). The pixel brightness range is determined by two thresholds. Pixels with brightness less the lower limit get alpha set to 0 (fully transparent). This effect allows you to operate with the alpha value of a pixel based on an estimate of the maximum value of the R, G or B components (RGB color model) or its perceived brightness (YCbCr or YUV color model). You can find it under Adjustments -> Alpha Transform This effect can be useful for creating an alpha mask of an image. This is an update of the original and slightly forgotten Alpha Transform plugin by changelog below.
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