@microsoft/fast-colors > Histogram
Histogram class
For each possible color, this counts how many pixels in the source image match that color. If signifigantBits is less than 8, each channel (eg: red, green, blue) in each color is reduced to fit in significantBits. So for the default value of 5 significantBits colors are reduced from 8 bits per channel (0-255) to 5 (0-31). Colors that were previously distinct get combined together. If the image source has more than 2^32 pixels (eg: a square image 65536x65536 in size) of the same color this code will break.
Signature:export declare class Histogram
Constructors
| Constructor | Modifiers | Description |
|---|---|---|
| (constructor)(source, significantBits, pixelSkipping, isHistogramPixelValid) | Constructs a new instance of the Histogram class |
Properties
| Property | Modifiers | Type | Description |
|---|---|---|---|
| data | Uint32Array | ||
| getHistogramIndex | (r: number, g: number, b: number) => number | ||
| getHistogramValue | (r: number, g: number, b: number) => number | ||
| maxBlue | number | ||
| maxGreen | number | ||
| maxRed | number | ||
| minBlue | number | ||
| minGreen | number | ||
| minRed | number | ||
| setHistogramValue | (value: number, r: number, g: number, b: number) => void | ||
| significantBits | number | ||
| total | number |