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

From: FRIGN <dev_AT_frign.de>
Date: Thu, 17 Jul 2014 15:44:26 +0200

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

> 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.

Okay, I did some short tests:

-- 1st test: waterfall.png (an example for a normal photograph)

718K Jul 17 15:33 waterfall.image.bz2
649K Jul 17 15:32 waterfall.png

-- 2nd test: bio_hazard.png (an example for line-art, where png shines)

9.2K Jul 17 15:35 bio_hazard.image.bz2
 21K Jul 17 15:35 bio_hazard.png

In both cases, the imagefile+bz2 wins (due to reasons I gave in my last
mail). Compressing the png's with bz2 obviously has only a minimal
effect, because the compressor can't look through the interweaved
png-format.

You can check out the files I used here[0].

Cheers

FRIGN

[0]: http://frign.de/static/imagefile/

-- 
FRIGN <dev_AT_frign.de>
Received on Thu Jul 17 2014 - 15:44:26 CEST

This archive was generated by hypermail 2.3.0 : Thu Jul 17 2014 - 15:48:14 CEST