Can the white background of the r.out.png of GRASS be changed to transparent?
GRASS GIS – How to Make a Transparent Background Image Using r.out.png
grasspngtransparency
Related Solutions
- Right-Click Layer Properties and select Transparency tab.
- You would have a default Row in the transparency pixel list. Delete that Row(Use Icon 3)
- If you just have to make the White part transparent, Create a new Row(Use Icon1). Enter 255,255,255 for Red,Green and white and Set 100 for percent transparent column.
- Click Apply and you are done.
Some sample results..
Additionally, if you want to make any other color on the raster transparent, You can click the Icon2, This would ask you to select a pixel on the raster using mouse. This might make QGIS go minimized for some weird reason, but you can restore it from the taskbar. Then click the color on the raster which you want to make transparent. It would add a new row for that color and make that color transparent for the raster.
I just gave this a test using ArcGIS for Desktop 10.2 on Windows 7 SP1 and was able to create a PNG and GIF files that had a transparent background that I could verify by inserting them as pictures into Word 2010 as In Front Of Text.
I followed the Exporting your map instructions from the ArcGIS 10.1 Online Help, using Rose Quartz as both Background and Transparent Color, doing so from both Data and Layout View, and otherwise taking all defaults.
PNG and GIF support transparency. They have a Transparent Color option, which selects the color in the map that will be marked as transparent. If you want to make only the background of the map image transparent, set Background Color and Transparent Color to the same color.
If at all possible, I would recommend upgrading to ArcGIS for Desktop 10.2 (or testing this on another machine with that version to decide whether you want to).
Best Answer
Have you tried '-t' flag? Its there in 6.4.1.