Re: I am getting wierd results when converting transparent PNG to WebP

[Urvang Joshi]

Hi Lesbitcoil,

I believe you are using v0.1.3 of library/binary (from: https://developers.google.com/speed/webp/download).

This version was released last year. At that time, transparency support was experimental and not part of official library/binary. So, what you are seeing here is an image with stripped alpha channel.

The good news is that the next version of WebP library/binary (v0.1.99) will be release very soon (in a week or so). This will add both transparency and lossless compression support.

Meanwhile, if you want to try out transparency/lossless support, I'll encourage you to compile cwebp & dwebp tools from the latest source in Git repo:

To get the source:

git clone http://git.chromium.org/webm/libwebp.git

Compilation:

cd libwebp
./autogen.sh
./configure
make  

This will create cwebp & dwebp binaries under directory examples/.

Also, try out the new "-lossless" option in cwebp.

Let me know how it works for your image!

Thanks,

Urvang

On Thu, Jul 5, 2012 at 2:54 PM, <lesbi...@gmail.com> wrote:

I've tried various tools to convert transparent PNG24 to WebP but I always get black areas which look terrible in the final image.

I also tried to command line official exe file, but get the same. I know that it suppose to work ok with transparent PNG, so what is wrong?

Thanks in advance.

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lesbitcoil