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Zoom Levels	Change image zoom levels. Even while the image is being displayed.
Image Panning	Move the image around to the part desired. Even while the image is being displayed.
EXIF*	Displaying EXIF information, such as Resolution, Exposure time, etc.
Exif Thumbnail	View thumbnails in EXIF if available, making quick browsing possible.
Annotation	Each image can be annotated. The annotation is directly saved as text (.txt) file.
Brightness Control	Image brightness can be adjusted. Viewing dark photos will not be a problem anymore.
Slide Show	Shows each image in the folder by self-running. Making viewing multiple photos a leisure.
m500/m125 support	JpegWatch uses Error Diffusion to enhace image viewing on black and white Palm devices.
Sony Jog-Dial Support	One hand image browsing using Sony Jog-Dial.
Full Sony Hi-Res (320x320) Support	Support 320x320 screen resolution on Sony CLIÉ devices.
No UI Blocking	Unlike many other image viewers, JpegWatch follows Palm's principle of programming strictly. User can stop a lengthy operation and jump to other Palm applications, such as HotSync, at any time.

*Exif: Exchangeable Image File Format. The format is used by most digital cameras.

There are many more exciting features can be found in JpegWatch waiting to be explored.

JpegWatch Application

Simply tap on JpegWatch icon to use the application. This will bring up the File List panel.

File List Panel

File List Panel allows users to manage image files and directories on memory card. There are two types of file items. One is JPEG files (with file extension .jpg or .jpeg) files and the other is directory folders (with <dir> attribute). Tap on the directory file item would change the current folder to that directory. Tap on the JPEG files would highlight the file and make the file available for operations.

Button Name	Functionality
View	View Image
Detail	Display the Exif information (Exposure Time, Date, etc.)
Delete	Deletes the file.
IR Beam File	User InfraRed to beam the currently selected file.
IR Receive File	Use InfraRed to receive incoming file. The file will be stored in the current directory.
Note	Make annotation of the selected image file.

Directory Control	Functionality
Directory Path Menu	If the current directory is not at root directory, tap on it would show up directory menu.
Up Directory Button	If the current directory is not at root directory, tap on it would bring the directory level up by one level.

Image Menu Name	Functionality
Image Details	Shows EXIF information, such as Exposure and Date/Time of the image.
View Options	Shows the View Options Dialog.
JogDial & Remote Control	Shows options for Sony Jog-Dial and Audio Remote Control. Only available for Sony CLIE with MP3 audio capability.
IR Beam File	User InfraRed to beam the currently selected file.
IR Receive File	Use InfraRed to receive incoming file. The file will be stored in the current ddirectory.
Set Default Directory	Sets the default directory. JpegWatch would try to open the default directory first when the memory card is inserted. If the default directory does not exist, JpegWatch would open the root directory.

Options Menu Name	Functionality
About JpegWatch...	Shows JpegWatch About Dialog.

Load Panel

Load Panel shows up when an image is being processed, such as right after user selects View Button in File List Panel. It shows the name and size of the image file being processed.

Cancel Button: Return to File List Panel
Up/Down Keys: Previous/Next Image.

Image Panel

Image Panel is where all the magics happen. The image is displayed and decoded and the same time. JpegWatch uses algorithm that only visible pixels (image dots) are decoded. The result is the fastest decoding speed ever seen on Palm devices. While decoding, the image can be set to the needed zoom level and moved around to the desired area. There is no need to wait for the decoding to completely finish.

Tip: Because only visible pixels are being calculated, decoding is much faster if visible area is smaller. There fore, decoding is faster if the scale is larger (i.e. 1/1 scale is faster than 1/4 scale).

Original image	Move the image

Image being decoded at new position	Finished decoding

1/8 Scale

Image Panel shows the image. The image was processed in the Load Panel and then displayed in this panel. There are quite some options for viewing image. The most obvious ones are the buttons on the right-hand side of the panel. Tapping on the buttons would show the corresponding results.

Double-Tapping on the image zooms into the next available scale level. For instance, if the image is currently at 1/8 scale, double-tapping would bring the image into 1/4 scale and centered around the tapping point on the image.