Does webp support grayscale colorspace?

Question

I see official cwebp document have no option to specify target colorspace https://developers.google.com/speed/webp/docs/cwebp

because I wish using grayscale color space could save some space for text image.

Quitrent

Answer 1

According to the Specification for WebP Lossless Bitstream and the VP8 Data Format and Decoding Guide, WebP only deals with (A)RGB.

Checkout the libwebp decode and encode APIs.

Whitehall