And there is still the always annoying “shift the texture something like one pixels in x and y” to match up texels and pixels as they have somehow different origins in vvvv.
LINEAR blurs the image only if the texel centers are always exact in the middle between the pixel centers so that four texels are linearly interpolated to get one pixel. For some historical quirky reason this is the default in vvvv. In case you switch to POINT, you will get no blur, as always only one texel is used, but you can not be sure which of the four surrounding. A wireframe diagonal in your source texture or some typographically inclined client will usually reveal this.
The usual solution is to shift the texture about 1 pixel in x an y with a transform node. At a certian setting you will see an increase in sharpness also in LINEAR mode. If you have this, switch to POINT, as it is the fastest, and you dont need any interpolation anyway.
In case source and target have exact same size and LINEAR and POINT give different results, it is most probably that texels and pixels are not aligned.