Set subsampling to 0 for RGB.

Fixes #233.
14 jobs for master in 5 minutes (queued for 4 seconds)
Status Job ID Name Coverage
  Style
passed #247014
amd64 debian
style-check

00:00:18

 
  Build
passed #247015
amd64 debian
build-debian

00:00:34

passed #247020
debian aarch64
build-debian-aarch64

00:01:30

passed #247021
debian aarch64
build-debian-aarch64-clang-5

00:01:04

passed #247016
amd64 debian
build-debian-static

00:00:32

passed #247023
debian aarch64
build-debian-werror

00:00:31

passed #247017
amd64 debian
build-debian32

00:00:25

passed #247022
macos
build-macos

00:00:31

passed #247018
win32
build-win32

00:00:32

passed #247019
win64
build-win64

00:00:34

 
  Test
passed #247024
amd64 debian
test-debian

00:00:44

passed #247025
amd64 debian
test-debian-asan

00:02:04

passed #247026
amd64 debian
test-debian-msan

00:00:59

passed #247027
amd64 debian
test-debian-ubsan

00:01:19