"Due to this small size there is a loss of precission of the textures" My guess is that the reduction process causes each new reduced-scale pixel to be logically OR'd (averaged) from a number of surrounding pixels. The large size reduction would mean this was a significant number of pixels per sample. So near the edge of the texture the OR process will include in a number of pixels from outside of the true texture area. If these extra pixels are a totally different colour - eg. white - the pixels around the edge will have an (increasing) amount of the incorrect colour - white - blended in. Hence the apperance of a gap in the seam, but reality a dilution of the colouring. If texture makers would darken the area surrounding the outline, this effect would probably not be so noticable.