Fast Image Viewer
Copyright (c) 2015 TDF Software
Written by Larry Bank

FIV has no external dependencies. The imaging code is completely self contained and written in portable C and optimized assembly language. Please send any feedback or licensing requests to tdfsoftware@gmail.com.

Fast Image Viewer Help
Introduction

Bookmark List
Main Viewer
File Information
Settings
Features
FAQ
Supported Files


Introduction
FIV allows you to view a wide range of image files on your iOS mobile device. It is designed to load images quickly and efficiently even on less powerful devices. FIV can be used to view photos, but it's best for viewing more "difficult" files such as multi-page TIFF, DICOM, animated images, legacy formats and special formats (e.g. WinFAX, JEDMICS, CALS). FIV excels at viewing giant bitonal images (e.g. engineering drawings, well logs). If your device supports 3D-touch, FIV supports quick-actions, peek/pop and accelerated panning based on the touch pressure.

Bookmark List
When starting FIV, the first view displays a list of recently viewed images (bookmarks). The first item in the list is the most recently viewed file. To begin viewing images, click on the cloud icon to open images from cloud service providers, the camera roll icon or the clipboard icon to view an image stored in the clipboard. The bookmark list supports the 3D-touch peek and pop actions. A long press will bring up an alert window which allows deleting of the current bookmark or all of the bookmarks. FIV supports multiple sizes of thumbnail images; choose the size by clicking on the cog icon on the toolbar. By default, FIV keeps a temporary copy of files from cloud service providers. These files get deleted when the bookmark is deleted. If this option is disabled (in the Settings), bookmarks of images opened from cloud service providers (or the camera roll) can become disabled if the image is renamed or deleted. In this case, when the bookmark is selected, FIV will remove it and display a message confirming its removal.

Main Viewer
When an image opens in the main viewer, it will be scaled to fit entirely in the window. Depending on the current image scale, the following gestures are available:

If the "show zoom" option is enabled, the zoom % will display as large digits when changing the zoom level. These digits will fade after a few seconds.

File Information
The file information window displays general and specific information about the current image page. The color bar in the first column indicates the type of information (green = general, blue = EXIF, red = GPS). If GPS information is present, the "show on map" button will be enabled. Pressing this button will open the Apple map application with a thumbtack indicating where the photo was taken. The "share" button will share an image of the file information list.

Settings
The following options are available from the settings window:

Features

FAQ
Q: Why does FIV display some PDF files incorrectly or not open them?
A: FIV does not implement a complete PDF viewer and can only view PDF files containing scanned images, not text or vector graphics.

Q: Why doesn't FIV open my email attachment automatically?
A: iOS doesn't handle email attachments gracefully (especially if they're in an unrecognized format); if they can't be copied to the clipboard or saved to the camera roll, then they need to be stored on a cloud storage service to be accessed by FIV.

Q: A supported image file is not displayed correctly; what can I do?
A: Please send any images which don't display correctly to tdfsoftware@gmail.com and we will correct the problem as quickly as possible.

Supported Files

TIFF All compression types and bit depths, multiple strips, tiles and pages.
JPEG baseline 8-bit gray and 24-bit color, normal (FFC0), progressive (FFC2), lossless (FFC3), extended (FFC1)
PNG All bit depths and options including animated
BMP Windows and OS/2, uncompressed and RLE compressed, all bit depths
GIF All bit depths and options including animated
FLI/FLC 8-bit palette color FLI and FLC (animated)
PDF Scanned images only (no text or vector graphics), FLATE/G3/G4 compression
CALS Type 1 (all) and Type 2 (non-tiled)
JEDMICS C4 All options
FAX BitFAX, WinFAX, Quicklinks plus additional undocumented files
TARGA All bit depths, both uncompressed and RLE compressed
AWD Microsoft "At Work" FAX, bilevel scanned images
IOCA/MODCA Bilevel scanned images
FILE MAGIC Westbrooke Technologies (*.MAG) scanned images
PCX/DCX All bit depths, single and multiple pages
DICOM single or multi-image (animated), uncompressed, RLE, JPEG baseline, progressive, lossless, extended
PBM/PGM/PPM Portable pixmap images (types P4/P5/P6 = 1bpp, 8bpp, 24bpp)