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Question

Tiff 2 ECW without black background

koenvdw
Contributor
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Hi

 

I have a workbench that converts Tiff tiles into one jpeg2000 with a transparent background.

This is the bench:

 

When I replace the jpeg2000 writer with an ECW writer I get a black background.

 

When I load a jpeg2000 in Qgis, the background is transparent.

When I load the ecw in Qgis I have to select in the settings under transparency band 3 as transparency band and then it's like the jpeg2000, but with an extra step.

 

Sadly our customer works with CAD and there I cant remove the black background with a setting....

 

Am I doing something wrong?

 

 

 

 

 

 

 

 

3 replies

david_r
Evangelist
  • david_rEvangelist
  • April 1, 2020

It looks like NODATA isn't supported in ECW, see here http://docs.safe.com/fme/2020.0/html/FME_Desktop_Documentation/FME_ReadersWriters/ecw/quick_facts_ecw.htm

I suspect that you have use an alpha-band for the transparency. Have a look at the sample posted by @helmoet here: https://knowledge.safe.com/questions/42118/making-black-no-data-cells-transparent-in-ecw-rast.html

koenvdw
Contributor
Forum|alt.badge.img+6
  • koenvdwContributor
  • Author
  • Contributor
  • April 1, 2020
david_r wrote:

It looks like NODATA isn't supported in ECW, see here http://docs.safe.com/fme/2020.0/html/FME_Desktop_Documentation/FME_ReadersWriters/ecw/quick_facts_ecw.htm

I suspect that you have use an alpha-band for the transparency. Have a look at the sample posted by @helmoet here: https://knowledge.safe.com/questions/42118/making-black-no-data-cells-transparent-in-ecw-rast.html

thx for your comment. Can you check the link you provided, because it's a link to this article...

david_r
Evangelist
  • david_rEvangelist
  • April 1, 2020
koenvdw wrote:

thx for your comment. Can you check the link you provided, because it's a link to this article...

Sorry about that. Fixed.

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