[edit] image_filter_transparency

Syntax: image_filter_transparency on | off
Default: on
Context: http
server
location
Reference: image_filter_transparency


This directive allows you to disable image transparency in GIF and palette-based PNG to improve image resampling quality.

True color PNG alpha-channels are always preserved despite this setting.

Note: Grayscale PNG's are untested, but should be handled as truecolor PNGs.

[edit] References

Original Documentation


Module: HttpImageFilterModule