Hi,

I have noticed the same. The alpha band appears also for the demo layer 
nurc:mosaic at least with Geoserver 2.12.2. Did you configure an image mosaic 
or a single image?

-Jukka Rahkonen-

Lähettäjä: Julierme Pinheiro [mailto:juliermeopensourcedevelo...@gmail.com]
Lähetetty: 7. helmikuuta 2018 21:36
Vastaanottaja: GeoServer Mailing List List 
<geoserver-users@lists.sourceforge.net>
Aihe: [Geoserver-users] Image Coverage Band Details

Hi all,
I am configuring a  3 Band image in GS and after configuration, the image gets 
another Band (4) with pixel value = 255 in and out of the image boundaries.
I am using the Raster default style. The Coverage Band Details and Band 4 are 
in attached.
Even setting the InputTransparentColor = FFFFFF, GS is unable to make RGB(255, 
255, 255) transparent.
Thank you for your time in advance
Julierme

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