SLP CURRICULUM GUIDE #17
Curriculum Guide Index

SLP Curriculum Guide #17: Straighten and Perspective Correction


The 'Deform Tools' are, for the most part, tools used to correct or fix photographs in particular ways. In brief, the tools we will cover in the next series of Guides include the following:

Deform Tools Icons
  1. The Deform Tool allows one to change the perspective of a selected or existing selection. A very versatile tool with unique options. Note: In PSP version X, the Deform tool is not visible initially and has been replaced with the 'PICK' tool which works exactly the same as the Deform Tool.
  2. The Straighten Tool straightens photographs so the perspective is looking straight at the object such as a building rather than looking at the object which is somewhat skewed.
  3. The Perspective Correction Tool fixes the perspective of objects that appear out of perspective to one of in perspective such as a building (initially looking down one side to looking square onto it).
  4. The Mesh Warp Tool is a very unique tool which uses a grid to fix perspective of sections of a photograph and has a number of unique options.

Using either the 'Straighten' tool or the 'Perspective Correction' tool is very easy and straight forward. These two twos are used to fix perspective in a photograph simply and easily. One point to keep in mind is that in fixing photographs one may need to use more than a single deformation tool. However, learning how each tool works will help determine which tool to use and when to use it.

GUIDE #17: STRAIGHTEN and PERSPECTIVE CORRECTION TOOLS

  1. To Display Tools that have been hidden by a PSP version:
    • Click on View || Customize
    • In Customize Window, Categories box (on left) select TOOLS
    • In the Commands: box (on right) scroll to tool wanted to be displayed on the Tool Bar.
    • Select tool, drag from Commands Box to an open area on the Tool Bar.
  2. When working with a photograph or image, duplicate it (Windows || Duplicate or [Shift + D].
  3. Both tools have a similar options: (Whether to Crop picture or not which allows the finished picture to be cropped automatically or manually dependent upon user's preference.
  4. Both tools cause the main picture to be re-oriented and if Crop Image is not set one will see unused areas of the final product which is why one will need to then Crop the image manually to create a finished product.
  5. Both Tools require one to Orient the Handles on the original picture in order for either straightening or fixing perspective is done.
  6. Remember to use the Undo (Ctrl + Z) often when experimenting with the perspective fix.

STRAIGHTEN TOOL

  1. The Straighten Tool has three modes: (1) Auto, (2) Make Horizontal, (3) Make Vertical. Each does require one to move the handles to the angle wanted. The Auto setting is often the easiest to use.
  2. In a picture to fix, locate an angle in an object and move the handles to each side of the object area. Then click on the 'Check Mark'. If Crop Image is checked the picture will straighten and be cropped as a finished product.
  3. Explore tutorial http://www.pspug.org/tutorial/html/tut9eff/beg13-tls-straight_v9.htm for detailed use of this tool.

PERSPECTIVE CORRECTION TOOL

  1. The Perspective Correction Tool has a number of options that are designed to be able to set the tool very accurately. However, a most practical way is to just grab the handles on the four corners and drag them so that the box surrounds the object to be fixed.
  2. Another option is the Grid Lines which will place grid lines within the correction box and can be useful to more accurately place the handles around the object to be fixed.
  3. Whether or not to use the Crop Image option may just require trying it on the photograph you are fixing. Sometimes it is better to not use this option though then one must crop the image manually.
  4. Explore tutorial http://www.pspug.org/tutorial/html/tut9eff/beg14-tls-correct_v9.htm for detailed use of this tool.

ACKNOWLEDGMENT

  1. When completing a tutorial or series of tutorials, and having placed them upon your web page, post in the SLP Forum your completed work using this layout:
    • a. Name or Screen Name.
    • b. Web Site URL.
    • c. Version of PSP using.
    • d. List of Tutorials completed.
  2. From exploration of using any of the Deform Tools on images and/or photographs post some of your results and or comments in response to the exercises.
    • a. Indicate what you did so others can duplicate.
    • b. Indicate what option values.
    • c. Add comments on your results and findings of interest.
    • d. Share your questions and comments in the SLP Forum and your graphic results in the member Gallery SLP Album as well as in the Forum.

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