Karbosguide.com. Software Tip

Fixing photos using Photoshop

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  • New (2006) Our big Adobe Photoshop Tutorial ... When you look at your digital images, you'll probably find that a few of them could benefit from some editing.

    The fish eye

    One of the problems you may experience consist of unwanted geometrical distortions.

    The lens of the digital cameras is rather "short", it covers a wide angle. This often gives geometrical distortions, especially photographing big objects at a short distance. If a square object fills all the image, you will see that the lines of the figure no more are parallel.

    You may download the photo by right clicking on it, then you can practise the operation on your own PC, if you have Photoshop installed. We use this photo of St. Victor in Marseille:

    It is not the photographer, who has had to much pastis. The photo has been taken on a very short distance. That has resulted in a significant distortion in the left part of the image.

    Too bad; otherwise the photo is OK, but now it is useless. Or what?

    Use Photoshop

    The photo is not to be wasted, it just has to be corrected. The great imaging editor Photoshop has the tools.

    You open the photo in Photoshop and choose Select all (Control+a).

    Next choose Edit --> Transformer --> Distort:

    Now you see eight handles in the corners of the image. You may drag one of the handles, and the image is geometrically distorted. This is how this tool works.

    You should apply a distortion which corrects the photo. Something like this:

    You always apply a transformation by hitting [Enter]. The the image is OK from a geometrically point of view:

    You may need to do a little further editing. In the left corner there is a grey are which is an unwanted effect of the transformation:

    It has to be corrected. Either you crop the photo, so this part disappears, or you may use the clone brush to edit the areas. All this is described in my Photoshop book), which is available in many European languages (not English, unfortunately).

    Finally the image should be saved in a high quality JPEG file. Delete the old version - you should not keep to versions of the same photo.

    The Photoshop function Transformation is great and very versatile. You may use for many very different task. Here is the resultat of our little exercise, which can be performed within a minutes time:

    The original photo:

    After the treatment:

    PS: All images on this page are heavily compressed. So the photo quality is not very good.

    If you want to see a beautiful photo from same location, please click here.


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