redshift是Linux下一款非常優秀的護眼軟件，可以自動定位經緯度，然後根據時間進行調整屏幕顏色，達到護眼的目的。但是我們可能想增強一下護眼力度，怎麼辦呢？
通過查閱官網文檔，得到的方案如下：
vim ~/.config/redshift.conf
在redshift.conf中輸入下面代碼：
; Global settings for redshift
[redshift]
; Set the day and night screen temperatures
temp-day=5000
temp-night=3500
; Enable/Disable a smooth transition between day and night
; 0 will cause a direct change from day to night screen temperature.
; 1 will gradually increase or decrease the screen temperature.
transition=1
; Set the screen brightness. Default is 1.0.
;brightness=0.9
; It is also possible to use different settings for day and night
; since version 1.8.
;brightness-day=0.7
;brightness-night=0.4
; Set the screen gamma (for all colors, or each color channel
; individually)
gamma=0.8
;gamma=0.8:0.7:0.8
; This can also be set individually for day and night since
; version 1.10.
;gamma-day=0.8:0.7:0.8
;gamma-night=0.6
; Set the location-provider: geoclue, geoclue2, manual
; type redshift -l list to see possible values.
; The location provider settings are in a different section.
location-provider=manual
; Set the adjustment-method: randr, vidmode
; type redshift -m list to see all possible values.
; randr is the preferred method, vidmode is an older API.
; but works in some cases when randr does not.
; The adjustment method settings are in a different section.
adjustment-method=randr
; Configuration of the location-provider:
; type redshift -l PROVIDER:help to see the settings.
; ex: redshift -l manual:help
; Keep in mind that longitudes west of Greenwich (e.g. the Americas)
; are negative numbers.
[manual]
lat=22.5
lon=88.3
; Configuration of the adjustment-method
; type redshift -m METHOD:help to see the settings.
; ex: redshift -m randr:help
; In this example, randr is configured to adjust screen 1.
; Note that the numbering starts from 0, so this is actually the
; second screen. If this option is not specified, Redshift will try
; to adjust _all_ screens.
[randr]
screen=0
其中temp-day是白天的色溫，temp-night是晚上的色溫，全天色溫在此區間變動，可以適當將其調低，護眼效果更明顯。
之後執行命令：
redshift -c .config/redshift.conf
重新開啓redshift，一定要注意先把原來的redshift關閉掉，不然兩個redshift會相互影響，看到的效果就是不斷閃屏