Day 4 - Perspective Tool to straighten and change perspective

The Perspective tool corrects lens distortion and can produce a creative look. It offers a Rotate feature that is better than the stand alone Rotate tool. There are also features to squash and stretch the image, change the viewpoint from side to side.

After you tap on the Pencil icon, then Perspective you then have several Mode options. These include; Tilt, Rotate, Scale and Free. You also have the option to select Fill Modes, including; Smart, White and Black.

The Fill mode fills in the corners and other areas of the image added to the image when using the Perspective tool. You can choose from Smart, White and Black. Smart mode is amazing. It actually uses the surrounding area as a source to copy and fill in the new, added areas. You have to use this feature to appreciate how amazing it is.

Tilt

After you tap on Tilt, swipe up down or left and right. Swiping up and down will change the vertical perspective, appearing to change the capture angle from a higher or lower perspective. In the example photo, this changes the angle of the interior walls. The bottom will either appear more stretched or narrow. 

Changing the horizontal perspective will change the angle to appear to have been captured from further to the left or right. Alter this too much and it quickly stretches the image too much and can look quite unrealistic.


Rotate

The standalone Rotate option within Tools will rotate, zoom in and crop the edges. The Rotate option within Perspective will also rotate the image. However, it will not zoom in. It adds to the original image and fills in the extra parts with content from surrounding areas. 

This is really helpful if you have a subject that is close the edges and you cannot afford to have any of it cropped out when straightening. 


Scale

This is a great option to ‘squash you image either vertically or horizontally. You may be thinking why would you want to do that? Once you start playing with this option, you will start to see how it can be used. I use this option occasionally for landscape images, to compress the middle of the image and make it look more like a panoramic image. This avoids cropping and compromising on removing the foreground or the sky. Before I use the scale image, more often than not I will change the fill mode to black. The next step is to then crop out the black section to retain the new ‘squashed’ version. 


Free

The Free Form function is a lot of fun and can very quickly get out of control. This is a feature that you just have to play with and experiment. Basically, hold a corner and drag it or out of the image to stretch the corner. The rest of the image will stretch with it and retain most of its shape. You can also hold and drag the middle of either a top or side edge. This will stretch two corners at once.


This feature can be used to correct and minimise lens distortion issues that are typical of a wide-angle smartphone lens.

Conclusion

As you can see, this is quite a powerful feature of Snapseed. Sometimes, depending on the content near the edges, the Smart Mode produces a less than ideal result. If that occurs, you can either crop out that section or use the Healing tool covered in Module 2 - Day 7.


It would be great to see your before and after images shared below in the comments. An app like Pic Collage (iOS and Android) or Frame Magic (iOS) are great for creating a side-by-side comparison of the two images.

Discussion

2 comments