On 11-05-31 03:31 PM, Eduardo Kanegae wrote:
Hi,
I have a Windows 2008 R2 Server running MapServer 5.2.1 from MS4W pack.
My trouble: I´m trying to display a gdaltindex file ( set of rasters ) but the
image border is not being displayed as expected.
The raster files are all 4-band based, with 3 bands for RGB and the 4th band
for ALPHA channel.
The band 4 has only two possible values: 0 ( for transparent desired area) and
255 for area where RGB bands has content
...
...
OPACITY ALPHA
Eduardo,
I am not clear on what "OPACITY ALPHA" is supposed to do. I don't think
you need it.
...
PROCESSING "BANDS=1,2,3,4"
PROCESSING "SCALE_1=AUTO"
PROCESSING "SCALE_2=AUTO"
PROCESSING "SCALE_3=AUTO"
PROCESSING "SCALE_4=1,2"
PROCESSING "RESAMPLE=BILINEAR"
SCALE_4=1,2 will transform 1 to 0, and 2 to 255 but the input values are
apparently 0 and 255 already (as I deduce from the qgis snapshot) so I think
you should just omit the SCALE_4 processing option.
There may be bad interactions between RESAMPLE=BILINEAR and the alpha
support. You might want to try with and without this option. If this is
an issue try upgrading to MapServer 6 and see if the problem persists. I
have made significant improvement in raster alpha handling in recent years.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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