Use correct dtype for RGB image alpha channel#1893

Merged

fmaussion merged 2 commits intopydata:masterfrom

Zac-HD:rgb-maps

Feb 12, 2018

Commits on Feb 9, 2018

Fix alpha channel logic for integer RGB images
Zac-HD
committed

Commits on Feb 10, 2018

Use named argument for concat axis
Zac-HD
committed