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Comment by vladdanilov | Hacker News Reader

  Photoshop: 6 705 bytes, 128 colors, 1-bit alpha only
  TinyPNG: 6 179 bytes, 92 colors
  Optimage: 5 761 bytes, 154 colors
  TinyPNG + Optimage (lossless): 5 226 bytes, 92 colors

https://imgur.com/a/X9DnJ

TinyPNG tends to use fewer colors. But its compressor is pretty suboptimal. I could reduce the image further by 15.4% with the tool I'm making (http://getoptimage.com).

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3545 bytes: https://i.imgur.com/dHIaRh1.png Used Gimp to convert to 4-bit paletted colormap, and processed through optipng.

The original PNG icon was very clearly suboptimal at 20 225 bytes...

It appears to have the same problem as Photoshop where indexed images can only have 1-bit transparency.

You can also losslessly compress it down to 2 803 bytes: https://imgur.com/a/SunI7.

Imgur converts everything both of you posted to JPEG...

What do you mean? It's serving me a PNG image.

Are you sure? Zooming in here I see JPEG artifacts. Imgur also often lies about the image format in the URL.

ImageMagick's `identify` claims it's a PNG:

    $ curl -OL https://i.imgur.com/dHIaRh1.png
    $ identify dHIaRh1.png
    dHIaRh1.png PNG 512x512 512x512+0+0 8-bit sRGB 3545B 0.000u 0:00.000

Yes, I can reproduce that. I get served different versions depending on device/browser, and on my phone I got a 7883 byte JPEG!

> 92 colors

I see 3 colors (blue, white, transparent).

The rest are needed to keep anti-aliased shapes smooth.

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