PTLens Alternatives
PTLens is described as 'software that correct lens pincushion or barrel distortion, chromatic aberration, vignetting, and perspective in normal and fisheye lenses'. There are more than 10 alternatives to PTLens for a variety of platforms, including Windows, Linux, Mac, iPhone and BSD. The best alternative is GIMP, which is both free and Open Source. Other great apps like PTLens are Glimpse Image Editor (Free, Open Source), showFoto (Free, Open Source), Ultimate Paint (Freemium) and WidsMob Retoucher (Paid).
- GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- Snapcraft
- FLATHUB
- PortableApps.com
- Haiku
- AmigaOS
- Glimpse is an open source image editor based on the GNU Image Manipulation Program. The goal is to experiment with new ideas and expand the use of free software.
- Free • Open Source
- Windows
- Linux
Discontinued
The Glimpse editor has been discontinued
Source: https://glimpse-editor.org/posts/a-project-on-hiatus/
- Showfoto is a fast Image Editor with powerful image editing tools.
- Ultimate Paint is a full-featured 32-bit Windows graphics program for image creation, viewing and manipulation.
Discontinued
The program is no longer updated. Last version, 2.88, released on 6 october 2005, can be still downloaded from the official website.
- WidsMob Retoucher is an excellent photo retouching program, which is able to reduce image noise, portrait retoucher, film pack, adjust effects, fish eye effects, vignetting and more other features to photos with ease.
- ShiftN is an intelligent tool capable of analyzing photos and fixing the line distortion (line convergence) effect automatically or with minimal user’s input. Batch processing.
- RealWorld Photos is an free portable photo editor for Windows. Retouch photographs and batch process images in an easy-to-use editor. Perform lossless retouching, watermarking and other operations on .jpg images.
- GimpLensfun is a Gimp plugin to correct lens distortion using the lensfun library and database. Move mouse over the example image to see the effect after lens correction.
- Home Photo Studio is powerful and easy-to-use photo editing software offering a complete set of image manipulation tools.
- Photopainter is both a natural-media painting software and an image processing system at the same time. You can not only use it to retouch your photo, but also turn your photos into natural style painting and create new works of art.
Discontinued
The program is no longer updated. Last version, 1.5.2.5, released in December 2007, can be still downloaded from the official website.