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Image / Local tool
Image Color Channel Extractor
Isolate the red, green, blue or alpha channel from a local image and export the selected channel as a PNG.
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Method, example & boundaries
Image Color Channel Extractor: from input to a reviewable result
Isolate the red, green, blue, or alpha channel from one local image and export the selected channel as PNG. The result helps diagnose color casts, transparency edges, and channel-specific source data before composition.
Worked example: inspect a semi-transparent red pixel
- Example input
- Source pixel RGBA(220, 40, 30, 128); select alpha.
- Example output
The exported channel represents that pixel at roughly 50% intensity because alpha 128 is about half of 255.
How to interpret it
Selecting red instead would emphasize value 220, while green and blue would remain much darker at 40 and 30.
Per-pixel channel isolation
The image is decoded to an RGBA canvas buffer. For the selected component, the worker reads that byte for every pixel, renders a visible channel representation, and exports a new PNG without uploading the source.
Color interpretation boundaries
- Browser color management may normalize embedded profiles during decode.
- An alpha channel shows opacity, not whether the visible edge will look clean on every background.
- The exported PNG is a derived visualization and does not preserve source metadata.
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