[opensource-dev] J2C fast decoder

[Ambrosia]

It goes even further. JPEG2k is superior in compression ratio compared
to quality to both, JPEG and PNG when it comes to lossy and lossless.
it is actually a quite awesome image format through and through.

The only real problem with JPEG2k are software patents. It's the
reason why free decoders like OpenJPEG and JasPer are so much slower
compared to KDU. KDU is developed by one of the people sitting in the
JPEG2K consortium, and is stuffed with proprietary algorithms.

On Mon, Sep 13, 2010 at 14:22, Leonel Morgado <leonel.morgado at gmail.com> wrote:
> Notice that old JPG does not support alpha channels (transparency). That
> means abandoning JPEG2000 would in fact force everyone with a single
> transparent pixel (even if just corners of round textures) to use lossless
> PNG for that, which is not optimal, to say the least.
>
> Inté,
>
> Leonel
>
>
> -----Original Message-----
> From: opensource-dev-bounces at lists.secondlife.com
> [mailto:opensource-dev-bounces at lists.secondlife.com] On Behalf Of Argent
> Stonecutter
> Sent: segunda-feira, 13 de Setembro de 2010 13:15
> To: Tateru Nino
> Cc: opensource-dev at lists.secondlife.com
> Subject: Re: [opensource-dev] J2C fast decoder
>
> On 2010-09-13, at 00:40, Tateru Nino wrote:
>> If we're using HTTP textures, is there actually any need for the JPEG 2000
> format? Since the transfer time of individual textures is vastly reduced
> (from the first byte to the last byte) the intermediate quality levels
> supported by jpg2k would seem to be redundant.
>
> I'm on a 256k DSL. I have HTTP textures enabled. I still see many
> intermediate texture levels.
>
> Also, for large textures, switching to PNG would likely increase the size of
> the transfer, which is not good.
>
> On the other hand, since both "old" JPG and PNG support progressive
> decoding, why not use PNG for lossless textures and JPG for lossy ones? Then
> you don't lose anything.
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