How can I make specific parts of .VTF files invisible?

[coxiesarmy]

Ive been trying to edit a .VTF (converted into a .JPG) with Gimp 2 and i was trying to make a part of it invisible, like Ive seen someone make the Scout's head invisible on TF2. I want to know how to make a specific part of a .VTF invisible and get it into the game so that You DON'T see the part that I made invisible, Anyone know a tutorial or know how Yourself?

[BreakinBenny]

Check [URL="https://developer.valvesoftware.com/wiki/Alpha_channel"]this[/URL] for the alpha channel, which is what you'd want, [URL="https://developer.valvesoftware.com/wiki/Alpha"]here[/URL] for information on the alpha and [URL="https://developer.valvesoftware.com/wiki/$translucent"]here[/URL] on how to enable transperency on the parts with an alpha channel

[coxiesarmy]

[QUOTE=BenjaminTennison;35316838]Check [URL="https://developer.valvesoftware.com/wiki/Alpha_channel"]this[/URL] for the alpha channel, which is what you'd want, [URL="https://developer.valvesoftware.com/wiki/Alpha"]here[/URL] for information on the alpha and [URL="https://developer.valvesoftware.com/wiki/$translucent"]here[/URL] on how to enable transperency on the parts with an alpha channel[/QUOTE] And where would I add this line; $translucent <bool> and where would i add this line;

LightmappedGeneric
{
$basetexture glass\window001a
$translucent 1
}

to the .VMT file?

[majik64]

Jpg doesn't support transparency

[noruzenchi]

were you perhaps looking for [url=http://www.gamebanana.com/tf2/tuts/9038]textures with edited mipmaps?[/url]