Negs

English · 简体中文

Your photos, developed on film.

Negs is a free photo app for your browser, Mac, Windows and Linux that runs your pictures through a physical simulation of film: the dyes, the print paper, the glow around highlights, the grain. They come out looking shot on film, not filtered to look like it.

Negs is built on two open-source projects: Andrea Volpato's spektrafilm, the spectral film simulation behind every stock, and turbasvin's spektrafilm-rs, the Rust port that runs it on the GPU. Negs improves on both: the GPU engine now matches the 64-bit reference render closely enough that exports run on the GPU by default, several times faster. It also adds Apple's RAW decoder and lab-style borders, and wraps it all in a web app and native apps for macOS, Windows and Linux.

[!TIP] Film simulation that keeps up with you. Every slider updates live. Faster than spektrafilm-rs; dramatically faster than Python spektrafilm.

▶ Try it in your browser · nothing to install · your photos stay on your device

Download for Mac · macOS 14 or later · Apple silicon and Intel · install steps

Download for Windows · Windows x64 · portable version · install steps

Linux · x86_64 · Flatpak · AppImage · Arch and Omarchy · install steps

getnegs.com

RAW · Apple default	Negs · Kodak Ektar 100

A darkroom in a window

In your browser, or as a native app on Mac, Windows and Linux. Pick a film, pick a paper, drag a slider, and watch the picture change as you move.

Open and organise

• Opens RAW files from most cameras, including Nikon HE★ (Mac only) and 60 MP medium format, plus JPEG, TIFF and PNG. Reads JPEG, PNG and TIFF colour profiles
• Gallery (Mac): open a folder and it is your library, with nothing to import. Browse it as a grid or a film strip, rate with stars, flag picks and rejects, filter, and see every photo developed, not as a grey thumbnail. Ratings and edits are kept in a small file beside each photo, and exports carry the rating as xmp:Rating for Bridge and Photo Mechanic
• Batch export a rating, a filter or a selection in one go (Mac)

Develop

• Pick from about 60 film stocks and papers, with a preview of each on your own photo
• Prep: highlights, shadows, contrast, lift and gain, colour boost and saturation, midtone detail, and Match camera brightness, which starts a RAW at the exposure your camera showed
• Lens corrections in the Mac, Windows and Linux apps: distortion, vignetting and chromatic aberration are fixed from the data in the file, using Apple's decoder on Mac and the camera's own correction data for Sony, Fujifilm, OM/Olympus, Panasonic and DNG on Windows and Linux
• RAW white balance: as shot, daylight, tungsten or a custom temperature and tint
• Image Size enlarges a photo before the film, so grain and halation form at print size instead of being stretched afterwards
• Crop, straighten, and add borders with each stock's real edge print
• Save, apply and share film and Lab presets, including Python spektrafilm community presets
• Undo, keyboard shortcuts, pinch to zoom: it feels at home on Mac, Windows and Linux

Export

• PNG, TIFF or JPEG (with a quality slider) that keeps your camera's EXIF, at 8 or 16 bits per channel, in sRGB, Display P3, Adobe RGB or ProPhoto RGB (16-bit only) with an embedded ICC profile
• Fast export on the GPU or Reference export on the CPU in 64-bit, see Speed
• Export the current film and paper colours as a 33³ sRGB .cube LUT from File → Export LUT… on every platform. No photograph is needed; spatial effects and Post edits are excluded
• Live preview while you drag a slider, and what you see in the preview is what you export
• The web app speaks English and Chinese (简体中文)

https://github.com/user-attachments/assets/25c00097-e668-48b2-8903-3299668b538e

Chemistry, not a filter

Negs doesn't guess what film looks like. It follows the light through the whole chain (film, enlarger, paper, scanner) using the published data for each stock.

This is the beginning of the README. Read the rest at the original. Read the full README ↗