Saving TGA with straight alpha (not premultiplied) and other weird stuff

Is there a way to save the alpha channel not premultiplied in a tga as I need straight alpha ... ?
While testing I got strange behaviour.... I have 5 bar from white to black with RGB value of 255,191,128,64,0
1) Copy pasting those from rgb to alpha give me some "conversion error"
255
191
128
64
0
255
191 and 192
128 and 129
64 and 65
0
Opening this in other software will give me
255
175
105
46
0
2) Copy pasting the red channel to the alpha give me "converted premultiplied" value
255
191
128
64
0
255
204
149
85
0
opening this in other software will give me
255
191
128
64
0
I don't think we're the only one that needs to have straight alpha?
cheers

RGB to Grayscale make sense but shouldn't create that much noise ...
When copying from the red channel to the alpha channel, in the same file,  I got those value as shown in the graphic and that's not gamma
But opening the image in any other software will be as the rgb value was. That means that editing value directly in the alpha when you need the exact value is impossible. That why we have to copy it from the red channel to the alpha channel to have the exact value

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