Edges of Items transparent at pixels with alpha value > 0 and < 26

Please attach the resource pack or provide a download link.

Please ensure that you do not have any pixels with an alpha value greater than 0 but less than 26 or so bordering the opaque pixels in the textures, as this will cause this issue. Please attach the resource pack or provide a download link.

How can i get a greater alpha value than 0 but not higher than 26. I dont understand

The alpha value must not be 1 .. 25.
0 is ok, 26 and higher is ok.

What is an alpha value?

?! How do I change it?

?!

This has to do with anti-aliased textures in general. This has broken a lot of texturepacks. A lot. I can only recommend reverting this change since this screws up hours and hours of work for no reason. Here is a video briefly showing how to fix it:
https://www.youtube.com/watch?v=R1GZA_x9ffs&list=UULxkLHhIjzPXGdxqeuVTgkQ

The same thing happens with (some) 3D item models

Will this ever be fixed?

There is nothing to fix since this is intended. The resource packs need to be fixed.

http://www.quora.com/Can-you-remove-anti-aliasing-from-a-layer-in-Photoshop

This appears to possibly be the answer