PNG Image Optimization

[Scott Rossi]

Hi Al:

I often use a "stress test" image that contains a color wheel and varying levels of transparency.  I tried a couple of the sites and the outcomes were pretty similar.  For myself, I'd rather use a tool that will batch process files locally and produce decent results, which ImageOptim seems to do.  It's possible one of those sites might save a few more bytes here or there, but as there already aren't enough hours in the day, I'd rather spend my time solving other issues in my apps :-)

Thanks for pointing out the additional optimizing options.

Regards,

Scott Rossi
Creative Director
Tactile Media, UX Design

On Aug 11, 2013, at 11:24 AM, Alejandro Tejada <capellan2000 at gmail.com> wrote:

> Hi Scott,
> 
> on Sat, 10 Aug 2013 13:17:14 -0700
> Scott Rossi wrote:
> 
>> in my experience, all of the options you cite
>> will usually work only if the colors of your source image
>> can comfortably fit within a range of 256 colors.
>> Images that are primarily solid colors or have
>> very complex patterns where dithering isn't
>> apparent are good candidates for reducing to 8 bit.
>> Photographic images with wide ranges of color
>> will often display visual artifacts when their color is
>> reduced to 8 bits, so the end result is not better
>> than the original.
> 
> Many Thanks, Scott, for answering this request.
> 
> Did you test optimizing this image:
> 
> http://upload.wikimedia.org/wikipedia/common/b/bc/Gluecksklee_(transparent_background).png
> 
> in each one of these websites?
> 
> http://www.8bitalpha.com/
> http://tinypng.org/
> http://compresspng.com/
> 
> In my tests, 8bitalpha.com always produces
> a smaller image and reduces the visible
> white artifacts around the transparent png.
> 
> Al
> 
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