[mapserver-dev] Transparency attribute on Layer Object

Daniel Morissette morissette at dmsolutions.ca
Mon Aug 19 13:28:37 EDT 2002


I never used it myself, but you might want to have a look at the
TRANSPARENCY parameter that was added at the layer level in 3.6:

I'm not sure whether this feature is properly supported with imagery
and/or 24 bits output in 3.7 yet... I'll let Frank/Steve reply on that.


David Graham wrote:
> Developers:
> I would like to know if anyone is working on a project to add transpency
> to Layer Objects that are of type raster data.  If not I am trying to
> size the effort required to add the ability to specify a transparency
> parameter in the layer object (map file) that could indicate % of the
> imagery to blend with existing data at rendering time.  The idea is to
> be able to blend multiple raster layers each overlaying the last.  Since
> the we now have 24bit support this should not be too difficult.
> Currently my requirements are only for Raster data, but it would be
> useful to eventualy extend the functionality to vector polygons filling
> also.  I am less familiar with that side of the code.
> Dave Graham
> --
> David W. Graham
> Director of Geospatial Applications Development
> information integration and imaging, LLC
> 201 Linden St, Third Floor
> Fort Collins, CO 80524
> (970) 482-4400
> dgraham at i3.com
> http://www.i3.com

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