---
title: "Image Formats"
description: "Image formats LumiScan Annotation Web reads: PNG, JPEG, BMP and TIFF including multi-page TIFF, how pages are named and annotated, and how the exports convert them."
product: "LumiScan Annotation Web"
component: "lumiscan-annotation-web"
version: "2.4.0"
display_version: "2.4.0.0"
latest_version: false
language: "en"
url: "https://docs.hdvisionsystems.com/en/lumiscan-annotation-web/2.4.0/image-formats.html"
---

# Image Formats – LumiScan Annotation Web

| Format | Notes |
| --- | --- |
| PNG (`.png`) | The format of the desktop tool and of LumiScan Training. Shown and exported as it is. |
| JPEG (`.jpg`, `.jpeg`) | Shown as it is; exported for LumiScan Training as PNG. |
| BMP (`.bmp`) | Shown as it is; exported as PNG. |
| TIFF (`.tif`, `.tiff`) | Also multi-page. The browser cannot show TIFF, so the server sends each page as PNG. Exported as PNG. |

## Annotation files and names

The boxes of an image are in `<name>.csv` next to it, the save history in `<name>.json` (see [Annotation Files](https://docs.hdvisionsystems.com/en/lumiscan-annotation-web/2.4.0/annotation-files.html)). Two images of a folder must therefore not have the same name without extension: if `part_01.png` and `part_01.jpg` are both there, only the PNG is listed (then JPEG, BMP, TIFF). [Adding images](https://docs.hdvisionsystems.com/en/lumiscan-annotation-web/2.4.0/adding-images.html) in the browser skips such an image.

## Multi-page TIFF

Every page of a multi-page TIFF is an image of its own:

| In the list | Name in the REST API | Annotation file |
| --- | --- | --- |
| scan.tif · page 1 | `scan.tif#1` | `scan_page001.csv` |
| scan.tif · page 2 | `scan.tif#2` | `scan_page002.csv` |
| scan.tif · page 3 | `scan.tif#3` | `scan_page003.csv` |

A TIFF with a single page is listed as `scan.tif` with `scan.csv`. Thumbnails and reduced-resolution copies stored in the file are not pages.

A single page cannot be deleted in the app, because the file holds the other pages. Delete or replace the file in the project folder instead.

## Bit depth

8-bit grey and colour images keep their pixels. 16-bit TIFF pages are reduced to 8 bit for display, suggestions and export, by the bit depth they actually use: if the brightest value is at most 1023 they are treated as 10-bit, at most 4095 as 12-bit, at most 16383 as 14-bit, otherwise as 16-bit. A 12-bit camera image stored in 16 bit is therefore shown with its full brightness range instead of nearly black.

## In the exports

LumiScan Training reads `<name>.png` next to each `<name>.csv`. The [export](https://docs.hdvisionsystems.com/en/lumiscan-annotation-web/2.4.0/export-for-lumiscan-training.html) therefore writes JPEG, BMP and TIFF pages as PNG (lossless): `part_07.jpg` becomes `part_07.png`, page 2 of `scan.tif` becomes `scan_page002.png`. The COCO export keeps PNG and JPEG files and writes BMP and TIFF pages as PNG.