| 1. |
First thing
to do is to load your image, and then turn or the RULERS by pressing
CTRL+R or by going to VIEW>SHOW RULERS
in the menu.
|  |
| 2. |
Press CTRL+D
just to make sure you don't have any current selections. Now, go to
the SELECT>COLOR RANGE menu and select the single
color background that your image is on. The "Fuzziness" setting should
be set to 0.
|  |
| 3. |
Invert your
selection by hitting CTRL+SHIFT+I (or use the SELECT>INVERSE
menu). Note: you could skip this step if you select the "invert"
checkbox in the color range settings.
|  |
| 4. |
Now you
make four guides (the blue lines)...the guides should automatically
snap to to the selection as you drag them (if not, use the VIEW>SNAP
TO GUIDES menu). If you've never used the ruler to
make guides, I guess I'll explain:
To make
a horizontal guide, you left click on the top ruler and drag downwards.
You should see a horizontal line that you can drag up and down...move
it until it snaps to the edge of the selection. Same thing for a vertical
guide, but you click and drag from the left ruler. Make four guides
for the top, bottom, left and right. It should look something like this:
|  |
| 5. |
Use the square
marquee 
to make a selection around your image. The selection marque will automatically
snap to the guides. Everything inside the selection is what we want,
and everything outside can now be cropped out.
|  |
| 6. |
And lastly,
go to the IMAGE>CROP menu and crop it.
The original
dimensions of this document was 200x100, but after cropping,
it's been reduced to 169x65. That's a savings of 9015 pixels!
=)
|  |