KLT Image

Compare subtle color while keeping the original photograph in view. KLT Image uses Karhunen–Loève decorrelation stretch to help you explore color structure in photographs. Import an image, calculate a result locally, and compare the unchanged original with the processed image. EXPLORE WITH CONTEXT • Compare Original, Side-by-Side, Slider and Processed views. • Zoom and pan registered images together, up to 1000% relative to Fit. • Calculate in RGB or CIE Lab D65, with covariance or correlation analysis. • Use the whole image or a rectangular region to define the statistics applied to the complete image. KEEP YOUR METHOD • Inspect the current analysis record and export it as JSON. • Create and exchange reversible working spaces. • Save a complete transform and replay its captured mathematics unchanged on another image. WORK AT FULL RESOLUTION • Open JPEG, PNG, TIFF and HEIC images. • Export processed images as PNG, TIFF or JPEG. • Process up to 100 selected images in a foreground batch, using independent whole-image calculations or a saved transform, with optional analysis records. PRIVATE BY DESIGN No account, ads or tracking. Image processing stays on your device. You choose when and where to import and export files. KLT Image is an exploratory imaging tool. Enhanced colors are not a scientific conclusion, and processing can amplify noise or compression artifacts. Inputs are oriented and converted to 8-bit sRGB. iPhone and iPad support images up to 26 million oriented pixels and encoded source files up to 256 MiB. Keep batch processing in the foreground. Source code is available under the GNU Affero General Public License, version 3. The official App Store build is distributed with an additional permission from its copyright holder. Copyright 2026 David Gibson. Corresponding source for iOS 1.1 (6): https://github.com/dtgibson/kltimage/releases/tag/ios-1.1-build-6