Calibrate optical exposure values (EV stops from -3.00 to +3.00 EV) with true logarithmic multipliers (2^ΔEV) directly in your browser. Features intelligent 18% neutral gray auto-metering, soft-knee highlight shoulder rolloff, shadow toe recovery, real-time 256-bin RGB and BT.709 luminance histograms, neon zebra clipping warning overlays, 60 FPS split-screen comparison, and lossless batch ZIP exporting. 100% private client-side processing with zero server uploads.
Universal Image Exposure Adjuster
Fine-tune true optical exposure stops, recover blown highlights and shadow detail, audit real-time zebra clipping masks, and batch calibrate high-res photos securely in your browser.
No Photo Loaded
Drag an image into the studio, click "Select Photo(s)", or load a sample scene.
Load a photo to use Split Comparison
Load an image to view color channels & luminance histogram
Queue is Empty
Upload multiple images to batch process optical exposure values.
In photographic science, Exposure Value (EV) scales exponentially according to a base-2 power law: Intensityout = Intensityin × 2ΔEV. Each +1.0 EV stop doubles the photons hitting the sensor, while -1.0 EV cuts the light exactly in half. Unlike basic brightness addition which washes out color balance, true logarithmic scaling preserves camera tonal ratios.
Standard linear exposure shifts clip bright pixels harshly at 255. Our Highlights Rolloff applies a soft-knee shoulder curve to roll off specular highlights smoothly, preserving sky detail and clouds. Shadow Recovery lifts deep shadows without lifting absolute black or crushing global contrast.
Enable the Zebra Clipping Warning overlay to highlight pure blown-out pixels (RGB ≥ 254) in vivid Red and crushed black pixels (RGB ≤ 2) in Blue. Use Auto Expose to automatically calculate the optical EV offset required to center average scene luminance at the 18% middle-gray photographic standard.
All pixel manipulations, LUT transformations, histogram evaluations, and ZIP compression run entirely within your local browser sandbox via HTML5 Canvas and typed arrays. No photos or sensitive images are ever transmitted to any external server.