Show LAB channels
See perceptual lightness plus green-red and blue-yellow. Nothing is uploaded.
- Your files are never uploaded
- Processed on your device
- Works offline
- Free, no sign-up
Drop your images here
Images · up to 10 files, 100 MB each
or paste with Ctrl+VLive preview
Settings
No settings needed. Each image becomes a triple-width PNG with L, A and B panels side by side.
Nothing is uploadedHow it works
Add your images
Choose JPG, PNG, WebP, GIF, BMP, AVIF or HEIC images to split into LAB panels.
View the LAB strip
Each photo becomes one wide PNG with lightness, green-red and blue-yellow grayscale panels joined.
Download the strips
Save each strip PNG on its own or download all strips together as a ZIP.
What the L, A and B panels show
The left panel shows L perceptual lightness from black to white as human eyes judge it. The middle shows A from green on the dark side to red on the bright side, and the right shows B from blue dark to yellow bright.
A green leaf is dark in lightness, dark in A toward green and mid in B, while skin is mid lightness with bright A and B. Neutral greys sit mid-grey in both colour panels.
How to read the strip
Add one or more images and the tool builds a wide PNG joining the lightness, green-red and blue-yellow panels side by side. The result keeps full resolution, so subtle colour shifts in skies and skin stay visible.
Your photos never cross the network because the work is done on-device. The browser holds pixels only while the tab is open.
When a LAB view helps
Use LAB to judge brightness without colour distraction, or to see colour casts that RGB hides. The lightness panel matches editing tools that separate tone from colour for retouching.
For hue lessons use Show HSL channels instead, which matches a colour wheel. Download the LAB strip PNG on its own, or convert a batch and collect everything in one ZIP.
Questions
Are my images uploaded?
No. Your images are opened and split inside your browser. They never leave your device.
What do A and B mean?
A runs green to red and B runs blue to yellow. Mid-grey means neutral; brighter or darker means a colour cast.
Why use LAB over RGB?
LAB separates how light or dark a pixel looks from its colour, which matches human vision better than red, green and blue amounts.
Is it free?
Yes. Free to use, with no sign-up, no watermark and no daily limits.
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