# gd Alpha Channel Test

If your browser fully supports PNG alpha channels, the "blended" and "alpha channel" images should appear identical to the naked eye. Miniscule mathematical differences may exist due to the 7-bit alpha channel resolution of gd.

Palette and truecolor images will look slightly different, as the palette versions are limited to 256 palette entries, which are used as well as possible to approach the effect of the original truecolor version.

Truecolor Images
Blending against light blue, Half Size |
Alpha channel, Half Size |
Blending against light blue, Full Size |
Alpha channel, Full Size |
Blending against light blue, Double Size |
Alpha channel, Double Size |
Palette Images
Blending against light blue, Half Size |
Alpha channel, Half Size |
Blending against light blue, Full Size |
Alpha channel, Full Size |
Blending against light blue, Double Size |
Alpha channel, Double Size |