It has been asked so many y yyyyy.......yyy.y.y.y.y...yyyy times. I think it is time for picture tutorial to make more understanding.
It is just almost the right thing to do, Dayou. Please follow my steps here:
1. You need to copy the satellite image that you want to do and paste into another layer in PHOTOSHOP.
2. Then you need to do transform-> scale the new layer. If you want have the 2 pixels edge around the 1024 x 1024 sheet. You need to scale down to 1020 pixel (2 pixels each side, so there is 4 pixels smaller). It is (1020/1024)*100= 99.6 percent. You put this number to the scale tool bar then you get two layers in one photo.
You will have the same layer as the 4 pixels edge in the lower layer now.
3. Then you go to gmax and map the texture. Then you unwrap your polygon and click on edit (3) put the vertex to the picture that you just transform to be a bit smaller. Gmax will let you map the vertex in proportion to the whole texture. You need to map the texture to the position at the 2nd pixel and the 1022 th pixel. So you can calculate how it gonna be by 2/1024= 0.001 and 1022/1024=.998 to to all horizontal and vertical vertex . Just select the vertices in horizontal (and vertical each time) and put 0.001 and .998 into the box (4). Now you have polygon that map on the texture of 1020 pixel, leaving 2 pixel (of the original 1024x1024 image) as the edge to eliminate the line in FS. It happens because the last pixel is not properly map.
If you do not make it two layers in PHOTOSHOP, leaving the white texture behind, that will be useless. Since your edge will be white by 2 pixel and it will become your line again.
Crystal clear by now, I think. Hope my English is good enough to make you understand. If not, please fell free to ask and other English-speaking Gurus will explain more.
