Re: [dev] Looking for simple, alpha supporting image format

From: Weldon Goree <weldon_AT_langurwallah.org>
Date: Thu, 17 Jul 2014 17:39:39 +0530

On 07/17/2014 02:43 PM, FRIGN wrote:
>
> I love this approach! Instead of trying to compress the image in the
> format itself (like PNG), we just leave it to the compressor to
> determine certain similarities and patterns.
> I suppose LZMA will give even better results.
>

I'm thinking back to my DSP class and trying to remember why time domain
storage like this isn't in favor with most of the image formats. I guess
TD storage limits you to lossless compression (you can lossy-ly compress
frequency domain data and the brain is apparently more forgiving of the
artifacts. Or so they say). And now that I think of it, this is roughly
the image equivalent of PCM audio, isn't it? (Except that PCM has a more
complex header, and the channels are stored sequentially rather than
interleaved.)

Now that I say that, I wonder if serial storage of the color channels
would compress better, since you'll generally have low-frequency content
for most of the channels most of the time.

On that note, I'm now curious how this format would handle line
noise/steganography. I'll report back if I find anything interesting on
either question.

Weldon
Received on Thu Jul 17 2014 - 14:09:39 CEST