Instructions
Greyscale, brightness, contrast
How to use
Choose a photo and set colour, brightness and contrast; the preview updates at once.
Choose a photo and set colour, brightness and contrast; the preview updates at once.
Supported input
JPG, PNG, WebP, GIF and BMP up to 40 MB. Greyscale uses Rec. 709 luminance. Brightness and contrast run from −100 to +100.
Input example
A colour photo
Result example
A greyscale photo
Troubleshooting
Unsupported formats and oversized files are refused with a reason. The original file is never changed.
Limitations
No white balance, saturation or sharpening. Large photos may respond slowly.
How it works
Turns a photo greyscale and adjusts its brightness and contrast. JPG, PNG, WebP, GIF and BMP up to 40 MB. Greyscale uses Rec. 709 luminance. Brightness and contrast run from −100 to +100.
Units & precision
JPG, PNG, WebP, GIF and BMP up to 40 MB. Greyscale uses Rec. 709 luminance. Brightness and contrast run from −100 to +100.