browser-image
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    A raster, or the part of it (rect) that counts, for sampleRasterHistogram.

    interface RasterSample {
        raster: Raster;
        rect?: Rect;
    }
    Index
    raster: Raster

    The raster (a tile).

    rect?: Rect

    Count only this rectangle (clipped to the raster). Default: all of it.