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Change color of pixels in a raster (png) image

Hi,

 

I have just begun using Illustrator CS6.  I have a very simple image (.png file) that I would like to annotate with some arrows and some text.  This file is what I guess you would consider a raster image (no vector graphics) that has a very limited color range.  It has less than ten basic colors plus a gradient fill (shades of gray) in a few places. 

 

I want to use illustrator to annotate this image with some lines with arrows and some text, but first, there are a few stray lines that I would like to eliminate.  For example, there is a black line that I would like to "erase" by replacing all the black pixels in this line with white pixels.  I tried to do this by selecting the "Paint Brush" tool and then selecting white as both my fill and my stroke color.  After doing this, I position the cursor over the pixels I want to change but the cursor appears as a circle with a line through it, and it doesn't do anything.

 

If anyone can tell me how I can do this, I would really appreciate it.

 

Thanks in advance,
Paul


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