Fast Image Viewer Help
Introduction
Working with FIV
Settings
Features
FAQ
Supported Files

Introduction
FIV allows you to view a wide range of image files on your Android mobile device. It is designed to load images quickly and efficiently even on less powerful devices. It can be used by opening a view "intent" from another application or through its built-in file explorer.

Working with FIV
If you launch FIV from another application (e.g. opening an attachment in GMail), you will go directly to the main viewer window. From here, pressing back will go to the file explorer by default or the recently viewed files list depending on the settings. You can also click on the menu button to open other files or choose other options. If you start FIV from it's icon, it will open the file explorer or recently viewed list. The following are the three main areas of FIV:

Recently Viewed Files
This list displays the names of files recently viewed sorted in the order of most recent to least. When an image is opened from another application (e.g. GMail), it may not come from a file because it was sent as a stream. This will display in the list as "latest_attachment". The list can be cleared from the menu. Press the browse button to go to the file explorer.

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

• Swiping up and down will change the page number (on a file with multiple pages). The page numbers will be displayed in large blue/yellow digits as the pages are changed
• Swiping left and right will change the file. If the image was opened from the file explorer, it will advance through files in the current folder. If the image was opened from the recently viewed files list, then it will navigate through files from that list
• Double-tap on a spot to zoom in to that spot; double-tap again to return to fit-to-window

Standard pinch-zoom gestures allow you to change the current zoom level from fully zoomed out (fit-to-window) up to 800%. When a finger is on the display and the image is not at fit-to-window zoom, a small square in the upper right corner indicates the relative position and size of the window on the document as well as indicates the current page and total pages if there are more than one. To change the view or manipulate the current image (e.g rotate), the following functions are available from the change view menu item:

• Scale: fit-to-window and 100%
• Rotation: 90, 180, 270 degrees
• Flip horizontal and vertical
• Invert colors
• Go to page - jump directly to any page
• Grayscale - Convert the current page to 8-bpp grayscale
• Bitonal - convert the current page to 1-bpp (bitonal) with dynamic thresholding

File Explorer
FIV includes a custom file explorer which allows you to browse the entire Android file system. There are five different views that can be chosen from the settings window:

• Grid (small and large) - a grid of thumbnail images with no text
• Details + small and large icons - a list displaying a thumbnail image along with file details (size, pages, etc)
• Details - a list displaying information about each file and no thumbnail image
• Filename Only - Displays only the name to fit the most names possible on the display

In all views, the current directory is displayed at the top of the window. The first item in the list is a directory named ".." which, when selected, will navigate to the parent directory. Long pressing on a filename will display the following list of options:

• Share - send the file via email, bluetooth, etc
• Set as wallpaper
• Delete (will prompt before deleting)
• Rename

Settings
The following options are available from the settings window:

• Sort Files By = Determines the sort order in the file explorer
• File Explorer View = Select one of five styles
• Ignore non-critical errors = Allow images to load and display even if an error is encountered
• Auto-Rotate Display = If display orientation is locked in Android, this allows it to rotate when running FIV
• Stretch thumbnails to fill space = The style of thumbnail images in the file explorer
• Pixel averaging = How images are displayed in the main viewer (nearest neighbor or pixel averaging)
• Animate files in browser = Enables animated files to display animated thumbnail images in the file explorer
• Show Zoom Controls = Displays or hides the Android zoom controls. By default, this will be displayed on devices without multi-touch displays
• Double Tap = Fit to width - changes the zoom behavior when at fit-to-window scale
• Show Filename = When navigating with the touchscreen, filenames will be displayed as a toast
• Load 24/32bpp images as 16bpp = for huge color images or devices with low memory, loading as 16bpp can save memory
• Start at Recent List = chooses whether to start on the Recent List or the File Explorer
• Define keys for program actions = for systems with keyboards/remotes allows you to customize the keys
• Slideshow Delay = The delay in seconds between each image being displayed
• Slideshow Transition = Choose between fade, slide or none.
• Loop Continuously = When checked, the slideshow will play until stopped by touching the display or a key
• Random Order = displays the slideshow images in random order
• Stretch To Fit = Display each image in the slideshow with no black borders

Features

• Display animated GIF/FLI/FLC in file explorer and main window
• View multipage TIFF files with no waiting
• Open gigantic bilevel images (e.g. engineering drawings, well logs) with very little RAM
• Pinch-zoom and swipe to navigate pages and files
• Display a slideshow of all of the images in the current directory
• Rotate, flip, invert, downsample and convert images
• Resize images to custom or standard sizes
• Crop images by coordinates or touch gui
• Set current image as the wallpaper
• Share the current image using email, bluetooth, etc
• Convert the current file into PDF (all pages at once)
• Save the current page as TIFF, PDF, PNG, JPEG or BMP
• Display detailed info about a file including EXIF GPS location
• FIV can be used as a file explorer when selecting files from other apps

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: Android doesn't integrate 3rd party apps into the OS; the user needs to select "share" or "open" in order for 3rd party apps to be used with the file.

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.

Q: Can I change the look of file explorer?
A: In the Settings page you can specify how the file explorer looks including a grid view, and the size of the thumbnail images.

Q: How can I stop Android from asking me to choose FIV each time I open an image?
A: If there is more than one application registered to open images, Android will display the applications in a list and ask you to choose. To set FIV as the default choice, check the box under the list to set it as the default action.

Q: Why is FIV force closing when I browse a folder with many files in it?
A: The file explorer caches the thumbnail images in RAM. For phones with little free memory, Android will try to close other apps and services.  This can cause the phone to behave badly or the program to close. Try using a details-only view (no thumbnails) to reduce memory usage.

Supported Files