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google / guetzli

Perceptual JPEG encoder
Apache License 2.0
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PGN with transparence turning full black jpg #209

Closed roger-russel closed 7 years ago

roger-russel commented 7 years ago

Yo I tried compress this image with this "guetzli --quality 84 ok.png ok.jpg": ok

But it was compressed to a full black jpg ok

romainmenke commented 7 years ago

README

Please note that JPEG images do not support alpha channel (transparency). If the input is a PNG with an alpha channel, it will be overlaid on black background before encoding.

roger-russel commented 7 years ago

I was expecting that would show a warning or error like when it show this: Only YUV color space input jpeg is supported Guetzli processing failed