How to Correct a Skewed Perspective in GIMP

Tuesday, June 14, 2011  at 6:58 AM
 Learn to adjust for perspective that is too strong in your photographs.  Welcome to the seventh article in my Photography Editing in GIMP series!

Previous articles:

Article 1: Easy Photography Editing in GIMP
Article 2: How to Crop in GIMP
Article 3:  How to Control Saturation in GIMP
Article 4: How to Control Contrast and Lightness
Article 5: How to Change Color Photos into Black and White
Article 6: How to Level a Horizon

These tutorials use the free photo-editing program GIMP.  I am not being paid to endorse GIMP--I just really like it!
How to Correct a Skewed Perspective

This tutorial will show you how to get from this:

Thai Travel Bus by Danalynn C

to this:

Thai Travel Bus by Danalynn C

This tutorial can also be used to adjust photographs of buildings that appear foreshortened, or any case when you want to change the perspective of the photo.

Step 1: Open the photo in GIMP.

Thai Travel Bus GIMP Tutorial by Danalynn C

Step 2: Set your guide lines by clicking on the triangles (they move with your mouse) along the measurement guides and dragging the created line to the proper place in the photo.  You want these guide lines to be where your corrected perspective lines will be.

Thai Travel Bus GIMP Tutorial by Danalynn C


Step 3: Select the Perspective tool from the toolbox (it's the tool that is a square being pulled to bit bigger on one side).  Drag the corners out to increase the size of the image in that direction, or push the corners in to decrease the size in that direction.

For example, with this image I pulled the corners out on the right side of the photo because that size was smaller (due to the angle at which I took the photo).  I also pushed in the corners on the left side of the photo to make the bigger, closer side look smaller and more in-line with the rest of the picture.  With buildings, leave at least a bit of perspective because otherwise it will not look realistic.  Sometimes you will have to leave a bit of perspective in play to avoid the image from looking stretched in weird ways.

Line up the edges of the image with your sight lines as possible.

Thai Travel Bus GIMP Tutorial by Danalynn C

Thai Travel Bus GIMP Tutorial by Danalynn C

Step 4: Now that you have stretched out your image, it is no longer a rectangle and you must crop it.

Thai Travel Bus GIMP Tutorial by Danalynn C

Step 5: Save and enjoy!

Thai Travel Bus GIMP Tutorial by Danalynn C
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