Nits

Nits — Support

Nits is a fast, native viewer for 16-bit HDR TIFFs on iPad.

If you need help, found a bug, or have a feature request, you’re in the right place.

Contact

The fastest way to reach me:

I read everything and try to reply within a few days.

Frequently asked questions

What files does Nits open?

Nits opens 16-bit and HDR TIFF files, including gain-map and floating-point TIFFs. Support for more formats (HEIC, AVIF, OpenEXR) is on the roadmap.

Why don’t I see the HDR “pop” in the App Store screenshots?

The App Store displays images in standard dynamic range, so the full HDR effect only appears once you open your own images on your iPad’s HDR display.

How do I see image information?

Tap the info control to open the EXIF panel (focal length, aperture, shutter, ISO, lens, color profile, bit depth, and HDR headroom), and the chart control to toggle the live RGB histogram.

How do I move between images?

Open any image from a folder and Nits loads the whole folder. Swipe left or right at fit zoom to step through, or tap a thumbnail in the filmstrip to jump directly.

How do I export or share an image?

Tap the Export button in the toolbar (⌘E with a keyboard; on iPhone, Export… is at the top of the overflow menu). Choose a format: HDR HEIC (for HDR images only), JPEG, or the Original TIFF. Pick a size (Small, Medium, Full, or a custom long edge) and whether to include metadata. Then choose Save to Photos, Save to Files, or share.

Why is Full size limited on my device?

Exporting a very large image at full resolution needs a lot of memory. On devices with less than 6 GB of RAM, Full is capped at 24 MP; with 6–10 GB it is capped at 48 MP. Devices with 10 GB or more export at the original resolution. If an export doesn’t fit, Nits offers the largest size that does.

How do I read the value of a pixel?

Touch and hold the image to open the Pixel Inspector. The magnifier floats above your finger and reads the pixel in its centre square. Drag to move it and lift to hide it. To keep it on screen, turn on the Pixel Inspector toggle in the toolbar; a single tap then places the loupe. This also works with VoiceOver. The readout shows each channel as a percentage, plus how many stops above SDR white it is (for example R 100% +0.3).

Why does Nits ask for access to Photos?

Only when you tap Save to Photos, and only for permission to add images. Nits can’t see or read your photo library.

Does Nits collect any of my data?

No. Nits does not collect, store, or transmit any personal data or images. Your files stay on your device unless you choose to export or share them.

Privacy

Nits collects no data. A full privacy policy is available here .

Nits is made by James Galt. Thanks for using it.