Online Image Color Channel Adjust Tool
Adjust red, green, blue channel intensity separately. Processing takes place locally in your browser.
Start using
What Online Image Color Channel Adjust Tool actually does
Three numeric controls independently set red, green and blue channel intensity. Each defaults to 100% and has displayed bounds 0..200%. There is no eyedropper, channel-isolation checkbox, selective-area mask, histogram or automatic color correction.
Checkable example
Verified example: RGB(100,150,200) with red 150%, green 50% and blue 0% becomes RGB(150,75,0). RGB(200,100,50) with red 200% clips red to 255 rather than producing 400, so reducing the setting later cannot recover detail from an already downloaded clipped result.
Controls, output and limits
For each pixel, output red=source red*(red percent/100), with the same formula independently for green and blue; results are clamped and byte-rounded. Alpha is not changed by this branch. At 100/100/100 RGB is unchanged; at 0/0/0 RGB becomes black while transparency remains as loaded.
Use it to reduce a color cast or create a deliberate RGB tint, but adjustments operate on decoded RGB values rather than an ICC-managed or RAW color workflow. Setting one channel to zero removes that channel's contribution; it does not export a separate grayscale channel plane.
Load one image, enter the three percentages, press Generate and inspect the result, then download PNG. Press Generate again after changing values. Processing is local to the browser's canvas; keep the source and check clipped highlights. Mobile numeric keyboards and download locations depend on the browser.
Input limits are 25 MiB and 24,000,000 pixels. Values outside 0–200% are constrained during processing; blank numeric fields use 100%. Every generation uses the loaded source rather than the previous result. PNG encoding is lossless, but the RGB adjustment changes pixel values.
Processing takes place locally in your browser.