LabStretch2 vs ChromaLens

LabStretch2 is a real-time image enhancement app, designed specifically for rock art researches to use in the field. Images can be acquired from within the app, or loaded from the iPad photo library. They can then be enhanced to see very faint color differences. Unlike the iPad version, LabStretch2 uses 2 screens, Settings and Image. The image thumbnail is also a Run button. For a description of the method, please see http://www.rupestrian.com/labstretch.html Usage Notes 1. Images are acquired by Capture Image, which takes a photo from within the app, or Import Image, which selects a photo from the camera roll. If you want to keep the image, use the camera and import the image from the camera roll. 2. Click Run. The image is downsampled and converted to Lab color space. The initial spread is applied. Try OffsetToggle to apply an estimated centering of the histogram before the multiplier (spread) is applied. Select the best toggle and then adjust the sliders. Run after each change. If the enhanced image is almost all one color, work with the offsets. 3. You can use the iPad screen capture to save results. 4. Use Save to capture the full-size enhanced to the camera roll. This requires considerable calculations and, depending upon your CPU speed, can take a minute or more. For assistance, please contact rockart@infomagic.net.

Transform how you see color. Reveal faint or hard-to-see details in the world around you using just your phone or tablet camera. ChromaLens is a camera app for iOS that acts as a “magnifying glass” for color, making subtle hue differences and contrasts more visible. Using the live camera on your iPhone or iPad, it lets you explore color relationships as you move freely through your environment. Unlike a typical image filter, ChromaLens uses advanced color remapping that adapts to the color relationships within each image or video. Rather than applying preset styles, it responds to the environment, revealing subtle patterns and unexpected details even in familiar scenes. Whether you're conducting visual analysis or simply curious about how color behaves in the world around you, ChromaLens offers an intuitive way to explore beyond ordinary perception. Record color-remapped video in real time. Already captured footage? ChromaLens lets you process saved videos too. Working with still images? ChromaLens captures and loads high-resolution stills and lets you apply the same color transformations from the video pipeline. ChromaLens’ rich, intuitive user interface makes it an ideal choice for color exploration in the field. Novice users can quickly see meaningful results thanks to its native Apple camera feel, built-in presets and responsive color sliders. Advanced users will appreciate a wide range of professional features, including color pre-processing filters, multiple process modes and color spaces, custom presets, in-app image library, and more. ChromaLens supports a wide range of uses, including: * Field documentation of faded or weathered subjects, such as rock art, murals, and historical surfaces * Artistic and experimental photography and filmmaking * Everyday exploration of color in natural and built environments Inspired by Jon Harman’s DStretch software, ChromaLens implements a modern, Metal-accelerated version of the decorrelation stretch technique developed for scientific image analysis in the 1990s. After the 7-day free trial, a one-time purchase is required to unlock continued access to all app features.