KLT Image for iPhone and iPad
Support
KLT Image is a free tool for exploring subtle image color structure while keeping the original unchanged.
Email developer@dtgibson.com for help.
Report a problem
Include your iOS or iPadOS version, KLT Image version and build, the action you were taking, image format and dimensions, and the exact error message. Share a sample photograph only if you have permission and are comfortable sharing its contents and metadata.
Opening images
Use a complete JPEG, PNG, TIFF, or HEIC original within the mobile limits of 26 million oriented pixels and 256 MiB of encoded source data. Allow a cloud-backed Photos or Files provider to obtain the original. A failed replacement keeps previously accepted work available.
Batch processing
Keep the app in the foreground and allow enough storage in your chosen destination. If a batch stops, completed files remain in its run folder. Review each item’s outcome and use the cleanup utility if it reports temporary data needing attention. Batches do not resume automatically, and existing outputs are not overwritten.
Interpreting results
Enhanced colors are exploratory visual evidence. Compare against the unchanged original and account for lighting, noise, compression, and clipping.
No account, subscription, or in-app purchase is required. Read the privacy policy for local file handling and system services.
License and corresponding source
Copyright 2026 David Gibson. Source code is available under the GNU Affero General Public License, version 3. You may use, modify and redistribute those AGPLv3 copies under that license. Existing AGPLv3 grants remain intact. The official App Store build is distributed with an additional permission from its copyright holder.
The AGPLv3 software is provided without warranty, including the implied warranties of merchantability or fitness for a particular purpose. Read the complete AGPLv3 license.
Download the exact corresponding source for iOS 1.1 (6). The source archive includes file hashes, build instructions, version change notices and the complete licenses. Source is available without charge or login.
Additional official App Store permission
For KLT Image (bundle identifier com.kltimage.ios), the copyright holder grants Apple and its App Store distribution affiliates a nonexclusive, royalty-free permission, solely in the portions of the official application owned by that copyright holder, to reproduce, digitally sign, encrypt, make delivery-format adaptations to, and distribute the official application through the App Store under Apple's Standard EULA and applicable App Store terms. This permission applies notwithstanding an AGPLv3 condition that would otherwise prevent that specific Store distribution. Recipients may install and use that Store copy as those terms permit.
This additional permission is conditioned on the publisher making the complete Corresponding Source for each distributed build available to the public at no charge under GNU AGPL version 3. Public source releases remain under AGPLv3, and existing AGPLv3 grants are not withdrawn. Recipients remain free to obtain, use, modify and redistribute those AGPLv3 copies under that license. This permission does not relicense third-party material, extend to other distribution channels, or change Apple's terms.
IBM Plex Sans and IBM Plex Mono remain separately licensed under the SIL Open Font License 1.1. Their notices are included with the application and source. Public support: developer@dtgibson.com.