[TAG] Image size vs. file size

[Jimmy O'Regan]

On 29 September 2010 03:28, Jimmy O'Regan <joregan at gmail.com> wrote:
> On 29 September 2010 03:13, Jimmy O'Regan <joregan at gmail.com> wrote:
>> On 29 September 2010 03:09, Ben Okopnik <ben at linuxgazette.net> wrote:
>>> which presents a GIMP plugin called "save_for_web" [laugh]. Someone
>>> there actually asked about changing color subsampling, and the author
>>> mentioned that it's in the works! Awesome stuff for the future, then.
>>
>> I think my last answer must have passed yours on the street and
>> neglected to wave :) ImageMagick supports changing colour subsampling,
>> and it makes quite a difference.
>
> Huh. On *my* sample image, it reduced it by more than half, but with
> yours, (with -quality 100) it actually increased the size :/ Using
> -quality 90 -sampling-factor 2:1:1 brings it to 556k, 4:1:1 to 506k.

Oh. As well as the 2:1:1 stuff, you can just give it -sampling-factor
2x2 etc., which is a little easier to remember

-- 
<Leftmost> jimregan, that's because deep inside you, you are evil.
<Leftmost> Also not-so-deep inside you.