Things You'll Need
Instructions
Open your photo-editing software, such as Adobe Photoshop or GIMP. If you do not have either of these programs, connect to the Internet and download one of them. Photoshop is an advanced program that you purchase; GIMP is an open source program modeled on Photoshop. The names of the tools may be slightly different, but the steps are the same for both programs.
Click "File" in the navigation bar and select "Open" from the drop-down menu. Use your cursor and navigate to the folder containing the picture with the crease you want to edit. Highlight the file by clicking on it, and click "OK" to open the file in the editor.
Click the icon in the left margin that looks like a small ink stamp; this tool is the "Clone Tool." Once selected position your cursor over a part of the picture that does not contain the crease. Press and hold the "CTRL" key and click on the portion of the picture you want to sample to fill in the crease.
Position your cursor over the crease and click to fill in the crease using data from the portion of the picture you sampled.