Question

Raster RGBA to RGB with NoData

  • 27 February 2023
  • 1 reply
  • 22 views
mariaka
Rank
Badge +2

Hi y'all,

I don't get it: I have a raster file with 3 bands: RED8, GREEN8, BLUE8, ALPHA8. The alpha band is either 0 or 255. There is no gradient. I need to hava a RGB24 raster with NoData, where Alpha is/was 0. The RasterInterpretationCoercer with "Apply the alpha band" will return these areas white. 🤷🏼‍♀️

I already tried other solutions, but couldn't get what I wand.

Can anybody help?

1 Attachment

1 reply

daveatsafe
Rank
Userlevel 2
Badge +17

Hi @mariaka​,

Please add a RasterBandNoDataSetter transformer before the RasterInterpretationCoercer, with Nodata set to 0 and Replace Cell Values set to No. This will set the Nodata values on the image bands, guiding the RasterInterpretationCoercer on the correct values to set on the transparent areas.

The resulting image will have the transparent areas set to 0,0,0, but they will appear the same color as the background in viewers that respect Nodata.

Reply


Community Stats

28,716
Posts
109,494
Replies
36,561
Members
Terms & ConditionsCookie settings
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.