The short answer
Why use Adjust Channels?
A photo with a green cast from office lights, or a red one from a sunset, needs one channel changed and the others left alone. Here you touch only the channel you pick.
Choose Red, Green, Blue, or Alpha from the Channel menu. Amount multiplies that channel by twice its value as a fraction: 50 keeps it the same, 70 (the default) is 1.4 times, 100 is double, and 0 removes the channel completely. The other three channels are not touched.
Raising a channel cannot go past full strength, so bright areas reach the limit and lose detail in that color first. With Alpha, values below 50 make the whole image partly see-through, but values above 50 cannot make fully transparent pixels visible again, because zero times anything is zero.
Color Temperature moves red and blue in opposite directions in one slider, which is quicker for white balance. Extract Channel shows a single channel as a grayscale image so you can see it. For a gentle, overall color wash rather than a channel change, use Tint.
Where Adjust Channels fits
Office light cast
Cut the green tint that fluorescent tubes leave on photos.
Sunset correction
Pull red down in a photo that came out too orange.
Fading overlays
Lower Alpha to make a PNG overlay semi-transparent.
Start to finish
How to use Adjust Channels
- 01Tap Choose image and pick the image with the color cast or the alpha to change.
- 02Choose the Channel, set Amount to 50 to see the original, then raise or lower it.
- 03Tap Apply changes, look at the brightest areas of that color, then tap Download result.
What to expect from Adjust Channels
| Check | What it means here |
|---|---|
| Supported input | JPEG, PNG, WebP, GIF, BMP, SVG and browser-supported AVIF images |
| Main controls | Channel, which picks red, green, blue, or alpha, and Amount, where 50 leaves it unchanged |
| Output | A PNG image with the adjustment applied |
| Working limit | 50 MB and 50 megapixels per image |
Adjust Channels tips
- The slider opens at 70 on Red, which is 1.4 times red.
- Amount 0 removes the chosen channel completely.
- Lower Green to about 40 to cut a fluorescent cast.
- Alpha below 50 fades the whole image toward transparent.
Adjust Channels FAQ
Something missing? Ask us.
Why does my photo look red as soon as I open it?
Can I change two channels at once?
Does Adjust Channels upload my file?
Is Adjust Channels free to use?
Why did Adjust Channels fail or look wrong?
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