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...because i need to split a polygon and i want to see the layer underneath it. But I have to select the polygon in order to cut it, and when i do that it turns yellow!

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up vote 6 down vote accepted

In version 1.7, go to Preferences > Options > General tab (opened by default). Then, click the yellow color in front of Selection color and change the alpha canal value.

My Qgis version is in French, sorry if the translation is not exactly correct.

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Change it to which value? – vascobnunes Jul 8 '11 at 15:36
vascobnunes > it is set to 255 ... try 20 or 0 to make it fully transparent – simo Jul 8 '11 at 17:05
Alpha channel doesn't seem to affect it in the latest build. Might be a bug, will chase it up. – Nathan W Jul 10 '11 at 22:24
@Nathan > Sorry, can't help you. I'm currently working with 1.7. Maybe someone could confirm – simo Jul 11 '11 at 10:59

For QGIS 2.6:

  1. Project Properties:

enter image description here

  1. General, Selection Color: enter image description here

  2. Reduce the Opacity:

enter image description here

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In QGis 2.2 you need to do the same edit the selection color in "Project Properties" (Win: SHIFT+CTRL+P) to make the selection transparent.

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