[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Adam7 and narrow PNG

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: Adam7 and narrow PNG
Date: Wed, 02 Oct 2013 11:28:52 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130821 Icedove/17.0.8

On 02.10.2013 08:57, Melki Christian (consultant) wrote:
> Limited usefullness. I've used a lot of PNG's in GRUB lately and can't think 
> of a reason why I would use either.
> Maybe paletted 8-bit (if-that’s what you meant?) to save space..
8-bit palette is an easy one. The tricky one is 4-/2-/1-bit palettes
(16-/4-/2-color) since then PNG packs several pixels in a single byte.
Usefulness of it to compress image is debatable since although it saves
space by itself, it messes with filter and huffman.
> but adam7? It's still going to be loaded as a bitmap.
> If I had some web png's and was to lazy to pass them through a converter...
The compatibility is the idea. Or if editor used by artist defaults to
adam7 and doesn't have an option (at least not easily accessible one) to
change this behaviour
> That beeing said, the work is done and unless it adds rediculous ammount of 
> code size or execution time I'd be fine with the support.
>> -----Original Message-----
>> From: address@hidden
>> [mailto:address@hidden On
>> Behalf Of Vladimir 'f-coder/phcoder' Serbinenko
>> Sent: den 2 oktober 2013 02:25
>> To: The development of GRUB 2
>> Subject: Adam7 and narrow PNG
>> It was reported that GRUB doesn't support Adam7 and paletteed PNGs.
>> Attached patch would implement both of them but combining them results
>> in quite complex code since PNG works on bytes even if bpp <= 4 but
>> adam7 works on pixels. Does anyone have thoughts on adam7 and narrow
>> PNG usefulness?
> _______________________________________________
> Grub-devel mailing list
> address@hidden

Attachment: signature.asc
Description: OpenPGP digital signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]