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Q.

Monitor shows incorrect color and non-smooth tone when connecting Mac via HDMI cable.

 

A.

When connecting Mac via HDMI cable, the monitor may show incorrect color and non-smooth tone.
 
In details, phenomena occurs such as:
 - High tone/low tone cannot be displayed correctly
 - Middle tones are skipped.
When these occur, we recommend using alternative ways than HDMI connection.
 
- Cause
Mac does not output full range, RGB signal but limited range, YUV signal from the HDMI port. 
This is an intended behavior of Mac. 
 
- Measures
1. Use alternative connection than HDMI.
 
    When Mac has following output connectors, please use these connectors.
   - Thunderbolt 3 (USB Type-C)
   - Thunderbolt 2 (Mini DisplayPort)
   - DVI
 
2. Change the monitor settings (ColorEdge monitor only)
 
    You can avoid this HDMI issue with the following "Signal Format" setting.
 
     For CG277 / CG247 / CG247X / CX271 / CX241 / CS270 / CS240
      Optional Settings -> Signal Selection -> Signal Format -> HDMI
      Change the setting to "PC"
 
     For CG2700X / CG2700S / CG2730 / CG2420 / CS2740 / CS2731 / CS2730 / CS2400S / CS2420 / CS2410
      Administrator Settings -> Signal Format -> HDMI
      Change the setting to "PC" or "RGB" or "4K 60Hz"
 
    Please refer to the user's manual for detailed procedure.

 

▼ Model:CG246 FAQ ranking

No. Question Category Date
1 FlexScan
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April 6, 2020
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3 FlexScan
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4 FlexScan
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February 7, 2023
5 FlexScan
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January 5, 2015
6 FlexScan
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7 ColorEdge
February 21, 2019
8 ColorEdge
March 22, 2019
9 FlexScan
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March 10, 2016
10 ColorEdge
April 6, 2016
11 ColorEdge
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12 ColorEdge
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13 ColorEdge
14 ColorEdge
15 ColorEdge
June 4, 2013
16 ColorEdge
17 ColorEdge
18 ColorEdge
19 ColorEdge
September 20, 2013
20 ColorEdge

 

▼ Model:CG246 Latest updates

No. Question Category Date
1 FlexScan
ColorEdge
FORIS
January 7, 2022
2 FlexScan
ColorEdge
July 31, 2020
3 FlexScan
ColorEdge
FORIS
April 6, 2020
4 ColorEdge
March 22, 2019
5 ColorEdge
February 21, 2019
6 ColorEdge
April 6, 2016
7 FlexScan
ColorEdge
FORIS
March 10, 2016
8 ColorEdge
May 1, 2015
9 FlexScan
ColorEdge
FORIS
January 20, 2015
10 FlexScan
ColorEdge
FORIS
January 5, 2015
11 ColorEdge
June 4, 2013
12 ColorEdge
June 3, 2013
13 FlexScan
ColorEdge
FORIS
February 7, 2023
14 ColorEdge
September 20, 2013
15 ColorEdge
16 ColorEdge
17 ColorEdge
18 ColorEdge
19 ColorEdge
20 ColorEdge
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