I have four band aerial photography - RGBI. I need to share it with my users, a mixture of MapInfo, QGIS, and ArcGIS.
What format should I store/serve the data in?
GeoTIFF isn't well suited to four bands because some applications assume the fourth band is transparency. ECW and JPEG2000 are proprietary, plus not all applications support four bands.
I can split it up into different layers/files but would prefer not to.