updateImgData()

function updateImgData(
   value, 
   pixelIdx, 
   imgData, 
   colorScale, 
   opacity): ImageData;

Updates an ImageData object with a new pixel color derived from a numeric value and a ColorScaleProps colormap.

Parameters

Parameter	Type	Description
value	number	Numeric data value to visualize.
pixelIdx	number	Byte offset within the ImageData.data array.
imgData	ImageData	Target ImageData object to update.
colorScale	ColorScaleProps	Colormap definition with min, max, and colors (see ColorScaleProps).
opacity	number	Global opacity multiplier between 0 and 1.

Returns

ImageData

The updated ImageData with modified pixel values.

Example

updateImgData(3.2, idx, imgData, { min: 0, max: 10, colors: viridis }, 0.9);