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I need to make some screenshots like the images in the following questions & wikipedia pages.

Currently, I'm using picpick (for screenshot) and GIMP (for image editing) on Windows XP, gnome-screenshot and GIMP on Fedora 18 (GNOME3 fallback mode). Without a proper tool I have to take several steps to make a final screenshot.

  1. Capture original screenshot, save as file1.png
  2. Using image editor or image viewer to zoom out file1.png
  3. Capture the zoomed screenshot to file2.png
  4. Open file2.png with same image editor, and do the following
    1. Draw borders carefully on both original and enlarged image, to make sure 2 borders are matched. (The borders of image in ”Bad font anti-aliasing in Ubuntu“ are not matched, so I guess it's drew by hand too)
    2. Cut the enlarged image with it's border (part of file2.png), and paste into file1.png
    3. Draw the projection lines
  5. The final screenshot (there's a transparent character "a" after rgb)

    rgba anti-aliasing example

It took me more than 7 minutes to make this example screenshot using gnome-screenshot & GIMP, most of the time are costed by selecting rectangles and drawing borders and lines. So I'm wondering is there an image editor, which can easily

  • Select rectangle area (optionally, combining Ctrl orShift key to select square area)
  • Display enlargement inside the same image (better in a different layer)
  • And have options to draw borders and projection lines
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You can make a macro to do that on GIMP, or crate an action on Photoshop - Photoshop actions are just macros with a different name. –  Alex Mar 18 '13 at 5:40
    
@martineau, thanks, but photoshop isn't free according the correction information. i prefer freeware. –  LiuYan 刘研 Mar 18 '13 at 8:43
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