Apply transparent colors in images

Many images have been cut from polygons, but in doing so, it has not been set a transparent color to the background and that’s why an uncomfortable black color appears. Or in other cases, we wish not be visible a range of colors; let’s see how to do it:

With gvSIG.

I’m using stable version 1.9, which download madness ended finally in twenty minutes. By the way, see the locator in the left pane, just as Qgis style.

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To add transparency to the image becomes the following:

  • Right click on the layer in the side frame, chose the raster properties.
  • Then, in the displayed panel, choose the transparency tab, and activate the checkbox
  • It is necessary to know the rgb color combinations, in this case I wish to remove the black, the combination is easy: 0,0,0. So, we add it, and then the black becomes transparent.
  • If you don’t know the rgb code, you can select it from the screen with some free programs which are there, as Visual Color Picker, for example.

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To save changes press OK

You can add more colors, although it wouldn’t be a wrong idea that for future versions, gvSIG would add a color picker that captures a color by clicking on the screen.

With Microstation V8

In the raster manager, select the image with a right click and choose attachment settings.

  • Mark the Transparent checkbox
  • Then choose the color we expect to be transparent.
  • Then press the Apply button

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Oops! You can only choose one and one condition of transparency for the rest.

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