image/png does not decode transparency correctly with certain images #439
Description
Before filing a bug, please check whether it has been fixed since the latest release: run "hg pull -u" and retry what you did to reproduce the problem. Thanks. What steps will reproduce the problem? 1. Decode the attached png image using image/png 2. Read the alpha value of the top left pixel (0, 0) What is the expected output? What do you see instead? Either the image should be rejected as having an unsupported format, or the alpha value should be read as 0, since the pixel is transparent. Instead, the image is loaded correctly, but the alpha value is 255, and the pixel is opaque. What is your $GOOS? $GOARCH? linux 386 Which revision are you using? (hg identify) 2fa0e9e84efd tip Please provide any additional information below. Image "ass_char_tran.png" from here http://forums.tigsource.com/index.php?topic=8834.05 , optimized with optipng.
Attachments:
- pngprint.go (260 bytes)
- a.png (5301 bytes)
