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

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.

• When scaled at fit-to-window, swiping left and right will change the page number (on a file with multiple pages). The page numbers will be displayed on the toolbar at the top
  
• When scaled larger than fit-to-window, swiping will pan the image in any direction. Devices which support 3D-touch can use more pressure to pan the image more quickly.
• Pinching with 2 fingers will allow zooming in and out. Images may be enlarged up to 800%
• Double-tap on a spot to zoom in to that spot at 100% scale (one document pixel = one screen pixel); double-tap again to return to fit-to-window (or fit-to-width of that option is set)
• Tap and hold to display a menu of additional options (flip, invert, email as PDF, print)
• Single-tap to toggle the bottom tab bar visibility
  

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:

• Animate files = Enables animated files to display animated in the main viewer
• Ignore non-critical errors = Allow images to load and display even if an error is encountered
• Double Tap = Fit to width - changes the double-tap zoom behavior
• Show Zoom Info = When changing the zoom level, it will be briefly displayed in large purple digits
• Keep a copy of cloud files = FIV will keep a local copy of files from cloud file providers to ensure that they are available at any time

Features

• Display animated GIF/FLI/FLC/PNG/DICOM
• View a wide range of current and legacy image formats including DICOM medical images
  
• Conveniently view your most recently accessed files from cloud file providers and the camera roll
• View multipage files with no waiting
• Open gigantic bilevel images (e.g. engineering drawings, well logs) with very little RAM
• Familiar gestures to zoom, pan and navigate pages
• Rotate, flip, invert images
• Share the current file in an email message as a multi-page PDF
• Print to AirPrint supported printers
• Save the current page in a variety of formats
• Display detailed info about a file including EXIF photo tags and GPS location
• Display the location on a map (if GPS info is in the image metadata)
  

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