[cite web]
url=http://www.i3a.org/i_flashpix.html
publisher=International Imaging Industry Association
title=AI3A Standards - Initiatives- Flashpix
date=September 1, 2006] which stores hierarchical data in a single file.Each image is stored with its sub-resolutions.Each resolution is divided by 2, until the entire image can fit in a single tile.Tile size is variable, but the default usuage is to have 64x64 pixels tiles (IVUE was using 256x256 pixels). Each tile can be compressed independently of other tiles using various algorithms (LZH, JPEG, RLE).Each pixel can have any number of channel of any size (for instance a 16bits CMYK image), interleaved or not. Including Alpha channel.
The result is a file bigger than the original file (at same compression), but never more than 33%. But it allows user to access only the needed parts of the image without having to read the entire file.
Let's take a 10200x7650 16bits CMYK image... using 64x64 tiles. It would use 595MB of disk-space.FlashPix, will store:
* The original
.)
* Sub-resolution 1: 5100x3825 pixels in 80x60 tiles (~ 149MB)
* Sub-resolution 2: 2550x1913 pixels in 40x30 tiles (~ 37MB)
* Sub-resolution 3: 1275x957 pixels in 20x15 tiles (~ 9MB)
* Sub-resolution 4: 638x479 pixels in 10x8 tiles (~ 2.3MB)
* Sub-resolution 5: 319x240 pixels in 5x4 tiles (~ 598KB)
* Sub-resolution 6: 160x120 pixels in 3x2 tiles (~ 150KB)
* Sub-resolution 7: 80x60 pixels in 2x1 tiles (~ 37.5KB)
* Sub-resolution 8: 40x30 pixels in a single tile (~ 9KB)Total size: ~ 793MB
A viewer (like photo editing software) will access only the needed part... In the worst case, for a 1680x1050 display, 53x33 tiles (56MB) are needed in memory, whatever portion of the image is being used. Meaning that on a 2GB computer, 36 such images (595MB) can be used simulatenously in the same project.
External links
* [http://www.i3a.org/technologies/image-formats/flashpix FlashPix page] on the International Imaging Industry Association website
References
