Global Mapper 19 does not properly support INSPIRE-compliant JPEG2000 orthoimagery

GeoloGISGeoloGIS Global Mapper UserPosts: 20Trusted User
edited February 21 in Bug Report
According to the European Commission's INSPIRE Technical Guidelines (v2013.12.10, page 140),
"JPEG 2000 allows defining opacity channel on more than 1 bit to have a scale of transparency. In our case, we‘re just interested in full transparency and full opacity. So, within the scope of INSPIRE, it is recommended to code it on only 1 bit (0= transparent, 1=opaque)
Recommendation 38:In the case of an opacity channel, the bit depth should be 1-bit"

We have thousands of orthoimagery files which are fully INSPIRE-compliant, yet Global Mapper v19.0 opens such files but displays them as fully transparent (and thus, nothing is to be seen), probably due to misinterpreting their 1-bit alpha channel.

Other JPEG2000 software (e.g. the free Kakadu kdu_show) have no such issue.

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