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When connecting Mac via HDMI cable, the monitor may show incorrect color and non-smooth tone.

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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.

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- 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.?

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- Measures

1. Use alternative connection than HDMI.

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? ? When Mac has following output connectors, please use these connectors.

　? - Thunderbolt 3 (USB Type-C)

　? - Thunderbolt 2 (Mini DisplayPort)

　? - DVI

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2. Change the monitor settings (ColorEdge monitor only)

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? ? You can avoid this HDMI issue with the following "Signal Format" setting.

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? ? ?For CG277 / CG247 / CG247X / CX271 / CX241 / CS270 / CS240

? ? ? Optional Settings -> Signal Selection -> Signal Format -> HDMI

? ? ? Change the setting to "PC"

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? ? ?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"

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? ? Please refer to the user's manual for detailed procedure.