On Friday, 19 October 2001 12:26 PM Nick May wrote:
>> >Can anyone tell me why DoCoMo decided to go with GIF format with
iMode
>> >as opposed to JPEG or PNG? There seems little sense in this, either
>> >technically or economically.
>>
>> Possibilities:
>>
>> 1) smaller files size (for icons and limited/flat colour files) than
jpeg.
>> 2) they can be made to flash/move. Horribly, but that is what many
here want.... .png could not (at launch time, at least)
>> 3) They had no idea the service would be such a success and did not
envisage colour screens, high bandwidth availability, etc...
>> 4) take less time to display on the original low cpu speed
handsets......
>> (???)
>> 5) Take less firmware code to process - again maybe relevant on the
original handsets....
>> 6) .png was still not mainstream when the service was launched.
4 and 5 are very significant,
The code to uncompress and display [non-animated]GIFs (in C/Assembler at
least) is much smaller (about 2-3x) and faster than that for JPG. PNG
is somewhere between.
Regards,
David Davies
http://www.intadev.com
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Received on Fri Oct 19 08:13:55 2001