topic Re: How to make white space not visible or transparent around imagery in Data Management Questions

How to make white space not visible or transparent around imagery

TiniaGraham — Fri, 04 Mar 2011 11:40:23 GMT

I am working with two .sid files that overlap each other and at the overlap, is where I see the white space. If I could just make it transparent (just the white space and not the rest of the image) then I could see my imagery without "white void". I wanted to delete the white in Photoshop but .sids are not supported. Any one know how to make the white not visible?

Re: How to make white space not visible or transparent around imagery

JohnSobetzer — Mon, 07 Mar 2011 12:22:40 GMT

Go to the sid's Layer Properties - Symbology and check Display Background Value and in the drop down select No Color. I think it likely that the 0,0,0 setting will work but if not repeat with 255,255,255. You can also try setting No Data to No Color.

You may not get a perfectly clean result even after doing this because the sid compression can introduce some data into formerly no data areas, but most of them should be gone. If these are still unacceptable you will have to clip to another image format like a tif which might make for some large files.

Re: How to make white space not visible or transparent around imagery

TimothyHales — Mon, 07 Mar 2011 12:25:54 GMT

In the Layer Properties > Symbology under the stretched renderer you can specify a background value be displayed as No Color. You could also use the raster clip tool to remove the unwanted areas as well.