Grayscale ECW opacity layer not correctly displayed

[RichardNicholls]

A problem we've had for ages is whenever we load a Grayscale ECW into ArcGIS with an opacity layer, the default is for it to load as a colour and use the opacity as the green/blue values and the grey as the red (see attached). Is there some way for Arc to default as greyscale correctly?

If I generate a mosaics without opacity, it loads correctly, but opacity is needed to remove the null areas.

We're using ArcGIS Desktop 10.6.1

[evemarwernick]

Hi, 

If you haven't solved it yet, I think you can get the results you want by changing the RGB Composite values:

Red: Grayscale

Green: Grayscale

Blue: Grayscale

Alpha AllOpacity

Regards,

Evemar Wernick