Jabier turned me on to pngquant offlist. It certainly seems better at
(lossy) optimisation of pngs than optipng.
However it comes nowhere near to the compression capabilities of just
a regular jpeg. I'm able to shrink a 1.8 MB png to 798kb, but a 70%
quality jpeg shrinks to approx 141KB.
Keep in mind that for e-commerce website, your site is ranked by
search engines by how fast it loads, and how much data it uses. 798KB
might not seem like a lot, but when you have a product with 5 images
to display, plus the site graphics, it's still unacceptably large.
Also, I'm hesitant to suggest lossy optimisation for pngs. The thing i
like about pngs are that they are not lossy, which is definitely
useful. I expect jpegs to be lossy. I also expect them to be tiny
comparatively at the same resolution, so it's a good trade-off. I
think probably the last thing users want to do is be fiddling with
file format compression options on their pngs, but I've added pngquant
to my graphics tools in case I need transparency + as small a file as
possible. It's good to know there's a middle-ground that uses pngs.
Unfortunately, even with optimisation, pngs are still not useful for
e-commerce web content.
-C
On Sat, Feb 18, 2017 at 5:12 PM, Maren Hachmann <maren@...3165...> wrote:
> Just a tiny bit of input, if sometime there's a decision between optipng
> and pngquant:
> Some time (years) ago there was a test in freiesMagazin (which is
> offline now :-() where pngquant came out as the winner in terms of
> quality-size relationship.
>
> See
> http://webcache.googleusercontent.com/search? q=cache:tJjnl9ViTaUJ:http:// www.freiesmagazin.de/ftp/2013/ freiesMagazin-2013-04.pdf% 2BfreiesMagazin+pngquant&hl= de&ct=clnk#19
>
> Maren
>
> Am 18.02.2017 um 17:17 schrieb C R:
>> Tried optipng, but unfortunately could get nowhere near the
>> compression I'd need vs jpeg. We're talking greater than 10 times more
>> compressed results with jpegs for nearly the same visual quality.
>>
>> I'm afraid it just doesn't cut it, unfortunately. :/
>> -C
>>
>>
>>
>> On Sat, Feb 18, 2017 at 2:44 PM, C R <cajhne@...400...> wrote:
>>> More PNG optimisation features would be great. I'd love it if I could use
>>> them in place of jpegs at the same file sizes I need, if they are also of
>>> equivalent visual quality.
>>>
>>> -C
>>>
>>>
>>>
>>> On 18 Feb 2017 2:24 p.m., "Alexandre Prokoudine"
>>> <alexandre.prokoudine@...3348...com > wrote:
>>>>
>>>> On Sat, Feb 18, 2017 at 5:18 PM, Shlomi Fish wrote:
>>>>
>>>>>> Built-in pngquant or pngcrush would be a great feature.
>>>>>>
>>>>>
>>>>> I think http://optipng.sourceforge.net/ is better than pngcrush.
>>>>
>>>> OptiPNG what I use too. I just don't have a particular opinion on the
>>>> available options :)
>>>>
>>>> Alex
>>>>
>>>>
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