You can use the Anti projective option to fix pictures (for example, posters) taken from a poor perspective. You may choose Edit - Anti projective at the Menu bar or click Image transformations at the Process toolbar and choose Anti projective. Here is the Anti projective option screen:

Drag corners to transform image. Select any fill color.

More settings available for the Resize, Rotate, Projective, Anti projective and Horizon strengthening options include Lanczos resampling, Linear resampling, Mitchell resampling and Nearest resampling. Resampling changes the number of pixels in an image, and is used to achieve a better output when the image size is in any way changed.

Click Apply you want to apply changes to one file. If you don't like effect, use CTRL+Z combination or Edit -> Undo from the menu bar to move back to the original image.

Choose the quality of the output JPEG file:

And click Save.

• To resize
• To crop
• To rotate
• To flip
• Projective
• Horizontal straightening