If the logo is a single color (black) on a transparent background as you described, using the Magic Wand with a low tolerance value (<30) and the Contiguous option (on the Property Bar) not selected, should work. With these settings, just click anywhere on the logo, and all areas should be selected. Once the selection is successfully made, you then need to fill it with your chosen color: you can use the Edit>Fill command and choose white (in the Use option in the Fill dialog that appears). The key is to get the selection right, otherwise the colour wil fill the entire canvas as you described.
Alternatively:
You can select the shape on any layer (that's not a Background layer) by right-clicking on the thumbnail for the desired layer in the Layers Palette, the choose Select Layer Transparency. The will create a selection that perfectly fits any shape on the layer, regardless of color. The Magic Wand on the other hand will only work effectively with solid or near solid single colors. After the selection is made, the steps to fill are the same as above.
There are other tools that allow you to select a color range based on samplings with the eyedropper tool, but that will not be necessary with scenario that you described.
Hope this helps :-)
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by: will_scarlet7Posted on 2005-05-19 at 05:15:33ID: 14035419
Try from the main menu:
"Select -> Color Range"