https://community.esri.com/t5/arcmap-questions/grayscale-ecw-opacity-layer-not-correctly/m-p/1132301#M3315 <P>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?</P><P>If I generate a mosaics without opacity, it loads correctly, but opacity is needed to remove the null areas.</P><P>We're using ArcGIS Desktop 10.6.1</P> Tue, 11 Jan 2022 02:13:32 GMT RichardNicholls 2022-01-11T02:13:32Z https://community.esri.com/t5/arcmap-questions/grayscale-ecw-opacity-layer-not-correctly/m-p/1132301#M3315 <P>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?</P><P>If I generate a mosaics without opacity, it loads correctly, but opacity is needed to remove the null areas.</P><P>We're using ArcGIS Desktop 10.6.1</P> Tue, 11 Jan 2022 02:13:32 GMT https://community.esri.com/t5/arcmap-questions/grayscale-ecw-opacity-layer-not-correctly/m-p/1132301#M3315 RichardNicholls 2022-01-11T02:13:32Z https://community.esri.com/t5/arcmap-questions/grayscale-ecw-opacity-layer-not-correctly/m-p/1410033#M4844 <P>Hi,&nbsp;</P><P>If you haven't solved it yet, I think you can get the results you want by changing the RGB Composite values:</P><DIV>Red: Grayscale</DIV><DIV>Green: Grayscale</DIV><DIV>Blue: Grayscale</DIV><DIV>Alpha AllOpacity</DIV><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="evemarwernick_0-1713231745788.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/100976i20A13D1A0C593E9B/image-size/medium?v=v2&amp;px=400" role="button" title="evemarwernick_0-1713231745788.png" alt="evemarwernick_0-1713231745788.png" /></span></P><P>Regards,</P><P>Evemar Wernick</P> Tue, 16 Apr 2024 01:47:35 GMT https://community.esri.com/t5/arcmap-questions/grayscale-ecw-opacity-layer-not-correctly/m-p/1410033#M4844 evemarwernick 2024-04-16T01:47:35Z