Function intensityBitmap

get a grayscale intensity bitmap of multi-channel pixel_buf image buffer, using an optional alpha_channel number to mask off the resulting intensity wherever the masking channel is zero (or less than the optional alpha_bias parameter).

  • intensityBitmap(
        pixels_buf: Uint8Array | Uint8ClampedArray,
        channels: number,
        alpha_channel?: number,
        alpha_bias?: number,
    ): Uint8Array

  • Parameters

    • pixels_buf: Uint8Array | Uint8ClampedArray

      flattened pixel bytes

    • channels: number

      number of color channels (ie: bytes per pixel). for instance, you'd use 4 for RGBA, 3 for RGB, 1 for L, 2 for AL, etc...

    • Optionalalpha_channel: number

      specify which channel is the alpha channel, or leave it as undefined to dictate lack of thereof. for instance, you'd use 3 for RGBA, 0 for AL, and undefined for RGB

    • alpha_bias: number = 1

      if alpha is present, you can specify the minimum alpha value required for the pixel to be visible. anything less will make the pixel dull

    Returns Uint8Array

Settings

Member Visibility