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P800/P802
White Paper, January 2003
31
Image formats
The table below explains the various image formats supported by the P800, together with
indicative file sizes for a QVGA (320 x 240 pixel) image.
Format Example
File Size
Description
BMP 226kB
Microsoft Windows Bitmap. A graphics format defined by
Microsoft supporting 1, 4, 8 or 24 bit colour depth. No
compression, so files can be very large. Used for icons and very
small images.
GIF 42kB
Graphics Interchange Format. Highly compressed by limiting the
colour palette to 16 or 256 colours. GIF is therefore good for icons
and diagrams. When a Jotter sketch is send as an e-mail
attachment, the GIF format is used.
GIF
(animated)
210kB
(5
frames)
A GIF file containing a number of images in a timed and repeating
sequence. Some P800 applications display only the first image in
the sequence.
JPEG
(.JPG)
13kB
An image compression format managed by the Joint
Photographic Experts Group. The format supports various
degrees of compression, enabling different quality/file-size
balances to be provided in one standard. JPG files support
millions of colours and are therefore good for ‘real life’
photographs.
MBM
Multi Bitmap. This is a Symbian OS format for colour and
greyscale bitmap images.
PNG 166kB
Portable Network Graphics. PNG compresses images with
millions of colours no loss of detail, but has comparatively large
file size. It is not commonly used.
WBMP
Wireless BitMap. Part of the WAP specifications, an image format
optimised for small mobile devices. The P800 supports Black and
White, 2-bit greyscale and 6-bit colour modes, according to ETSI
3GPP TS 23.040
Colour Screen
Images having more than 4096 colours will be
adjusted to display optimally within the
capabilities of the P800 screen.
Images larger than the display area will generally
be scaled to fit the application window.
The Image Viewer uses 192 x 144 pixels in full
screen mode.
Screen Specification
Type: TFT
Size, flip closed: 208 x 144 pixels, 40 x 28 mm
Size, flip open: 208 x 320 pixels, 40 x 61 mm
Pixel Size: 0.192 mm
Pixel Density: 132 DPI (Dots Per Inch)
Colour depth: 12-bit (4096 colours)
Surface: Touch-sensitive, anti-reflective
Illumination: Front-light