Image Blending - Albedo Sandworm

October 31, 2022

I dont understand the image blending in Sandworm.

I have a set of Albedos which create a layer in the sandworm tool. (I upload a couple in to /upload/Werner_AlbedoImages in case you can/want to test).

When they are created they are correctly aligned, but they are blended in that way --- see image (--- Blending mode set to albedo only).

The rest of the Layer appears black. It seems, that the blending does take the underlying Black color in consideration.
(It might be that there is something wrong with the alpha channel of the images??).

Combined with the height layer it looks like that:

Using Albedo with Alpha it looks like that:

and that:

weird.

Edited October 31, 2022 by werner.poetzelberger

November 1, 2022

Hi Werner,

Is each tiff file imported as separate landscape? Can you send us also your .sworm file as well?

November 1, 2022

marcator 3395.sworm

Not every tiff is a seperate landscape.

The tiffs seem to form one layer, there is the heightmap and another albedo layer.

Edited November 1, 2022 by werner.poetzelberger

November 2, 2022

Hello!

Werner, we have investigated subject issue and unfortunately at the moment there is no way to somehow adjust this behavior either using Editor or with the Sandworm Tool itself. Used sources are contains alpha channel layer with the value (0.5) which is could not be processed correctly with the Sandworm Tool internally.

Right now the only way to get a correct result are requires to completely remove the alpha channel layer from sources data using some third party application.

Truth be told this is the first time that we have encountered a problem like this and now we think that there should be a way to choose what exactly channel will be used for generation. But most likely these changes should not be expected before 2.17 release.

Sorry for the inconvenience caused.

Thanks!

November 3, 2022

Hi.

Ja very interesting indeed. No problem here. I just started using Sandworm as well sources which are available.
I am getting into the wholegeospatial topic and as well into all the formats, finding right tools etc.

So the source is actually from earth explorer and are unmodified images.

This might be interesting ... https://gdal.org/programs/gdal_translate.html#gdal-translate

as well that one: https://www.gisinternals.com/

and this one: https://www.qgis.org/en/site/