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Which mode do you need?
| Mode | What it does | Typical use |
|---|---|---|
| Grayscale | Blends every pixel toward its own luminance until the image is black and white. | Documentary look, printing in mono, removing a distracting brand colour. |
| Remove one colour | Finds every pixel close to the colour you pick and makes it transparent. | Green-screen cutouts, removing a coloured sticker, isolating a product on a solid backdrop. |
Removing one colour properly
Colour removal here is a distance test in RGB space, not an exact hex match. That matters, because a real photo never contains one uniform value — even a flat-looking backdrop varies by a few percent from corner to corner. The steps that give a clean cutout:
- Pick the colour. Click the swatch and choose the dominant colour of the region you want gone.
- Raise the tolerance slowly. Start at 15% and increase until the unwanted region disappears. Overshooting starts eating the subject.
- Add feather. A little feather softens the edge so it does not look cut out with scissors.
- Download as PNG. PNG keeps the transparency. A JPG export would fill the holes with black.
Why the grayscale result looks better than a plain desaturate
Most tools convert to black and white with a flat average, which makes reds and greens land on similar greys and kills separation. This tool weights channels the way the human eye does — 29.9% red, 58.7% green, 11.4% blue — so skies stay distinct from foliage and skin tones keep their shape. The Contrast slider then adds punch back if the result looks flat.
If the area you removed still shows a thin fringe of the old colour, your tolerance is a
touch low. Raise it by 5% at a time and re-check the subject's edge.
FAQ
How do I remove color from an image for free?
Upload the image, keep the mode on Grayscale and drag Color removal to 100%.
Click Download to save the black and white image.
How do I remove just one colour, like a green screen?
Switch the mode to Remove one colour, click the swatch and pick the colour you want gone,
then raise the tolerance until it disappears. The removed area becomes transparent.
Does removing colour reduce image quality?
No. The operation is a per-pixel recalculation at full resolution — no downsampling, no
recompression.
Can I keep one colour and make everything else black and white?
Not in a single click yet. The closest workflow is to remove the unwanted colour in Remove one
colour mode, which leaves a transparent hole you can fill with grey.
Why is my JPG download showing black instead of transparent?
JPG has no alpha channel. Always download as PNG when you want transparency.
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