i just got photoshop 7.0 and i've had success at blurring anything i needed to, but the last few times i've tried to use the blur tool to just blur a certain part of the image it's making no visible changes. i've used different brushes and thicknesses and now i don't know how to blur any more of my backgrounds! any advice???
Check your resolution or pixels per inch. The higher resolution images need a different settng of the blur tool than lower resolution images.
Very likely if the image your working on is configured in layer, you've probably pasted in a subject, so you need to go to the Layer Palette dialogue and make the background layer active to use the blur filter on the background.