Extraneous Pixels in DDS Transparency

Hello,

I’m generating DXT1 files (1-bit alpha) from PNG images with transparency. The original color for the transparency is black.

For some edge pixels that are dark (but not pure black), I get extra pixels in the DDS files.

These images hopefully illustrate the problem.

I filled the transparency with white to display these clearly.

The original images are here: http://www.celestialmuse.org/pangloss/temp/png-dds_problem.zip

I’ve had this problem with both the command line program and the photoshop plugin. These examples were created with the latest version of the plugin.

I used various versions of these programs over the years, but the problem always seems to occur.

Are there any settings that I can change to eliminate this?

Thanks for any assistance.