Sampled Image RGB Palette
Sample decoded image pixels into coarse RGB buckets and return up to eight frequent buckets; no median-cut or perceptual ranking.
About this sampled image rgb palette
Sample decoded image pixels into coarse RGB buckets and return up to eight frequent buckets; no median-cut or perceptual ranking Processes media assets directly in the browser using HTML5 Canvas and WebAssembly decoders, ensuring zero file uploads.
Image processing & canvas pipeline
Select an image and decode it to Canvas pixels. Sample at a stride and group RGB values into coarse buckets. Return up to eight buckets sorted by sampled frequency.
Worked image transformation example
Scenario: Extract sampled RGB buckets from a four-color 12×9 PNG.
Sample input:
Processing: Samples at most roughly 4,096 RGBA positions, quantizes each RGB channel through paletteChannel, counts buckets, and returns up to eight most frequent RGB buckets.
Illustrative output:
Resolution, dimension & memory limits
This is not median-cut clustering or a guarantee of perceptually dominant colors; Canvas readback may fail for unsupported images.
Sampled Image RGB Palette image operations execute in client memory via HTML5 Canvas and browser decoders. Inspect output previews before replacing source assets.
In-memory image processing boundary
File buffers and document assets in Sampled Image RGB Palette are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Image format & W3C Canvas standards
W3C Canvas 2D context specifications and standard image container formats:
- Sampled RGB channel buckets (implementation-specific; no CIE color-space conversion)
Sampled Image RGB Palette verification · Audit standards
How to use it
- Enter, paste, or select your input data into the Sampled Image RGB Palette workspace controls.
- Review parameter fields, units, or options configured for Sampled Image RGB Palette.
- Click the action button or observe immediate live calculations rendered by Sampled Image RGB Palette.
Frequently asked questions
How does Image Color Palette Extractor produce its result?+
It reads Canvas ImageData, samples at a stride chosen to cap the work near 4,096 pixels, quantizes each RGB channel with paletteChannel, counts buckets, and returns at most eight buckets ordered by sampled count.
What input and controls does the palette extractor provide?+
The page has one image-file chooser and Process locally. It has no palette-size, color-space, transparency, seed, median-cut, CIE, named-color, or export-format control.
What limits apply to the palette result?+
Counts are from quantized sampled pixels, not an exact census or perceptual color distance. Browser decoding must succeed; the output is JSON RGB bucket/count data, not a guarantee of visually dominant colors.
What result and limits should I expect when using Sampled Image RGB Palette?+
Download the 12×9 four-color test PNG and process it locally. Because every pixel is sampled, the RGB buckets are blue 0,0,255 × 30; yellow 255,255,0 × 30; red 255,0,0 × 24; and green 0,255,0 × 24. Larger images are sampled and may omit colors.