Show YCbCr channels
See JPEG-style brightness and chroma side by side. 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 Y, Cb and Cr 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 YCbCr panels.
View the YCbCr strip
Each photo becomes one wide PNG with luma, blue-difference and red-difference panels joined together.
Download the strips
Save each strip PNG on its own or download all strips together as a ZIP.
What the Y, Cb and Cr panels show
The left panel shows Y digital luma brightness as used in JPEG and video. The middle shows Cb blue-difference chroma and the right shows Cr red-difference chroma, both mid-grey for neutral greys.
A sunny beach is bright in luma with strong Cb in the sky and strong Cr in warm sand, while a document page is bright in luma and flat mid-grey in both chroma panels.
How to read the strip
Add one or more images and the tool builds a wide PNG joining the luma and two chroma-difference panels side by side. The result keeps full resolution, so compression-style brightness separation stays exact.
No cloud step is involved — open, view and save without any transfer. The file you download is the only new copy that exists.
When a YCbCr view helps
Use YCbCr to understand JPEG size: sharp luma keeps text crisp while soft chroma saves space. Blotchy skies often show blocky chroma panels before you notice it in colour.
For old TV history try Show YIQ channels, which is the analogue ancestor of this digital system. Download the YCBCR 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 Cb and Cr mean?
Cb is blue minus luma and Cr is red minus luma. Mid-grey means neutral; brighter or darker means a blue or red shift.
Why does JPEG use YCbCr?
Eyes notice brightness detail more than colour detail, so JPEG keeps full luma and compresses chroma harder for smaller files.
Is it free?
Yes. Free to use, with no sign-up, no watermark and no daily limits.
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