Has anyone realize that after unwrapping the uv through scanline render &
use that as a material with the ApplyMaterial node & render back out with
another scanline render node would degrading the image's quality?
I"m attaching 2 images here if anyone want to check.

below is the script:
_________________________________


set cut_paste_input [stack 0]
version 6.3 v8
BackdropNode {
 inputs 0
 name BackdropNode33
 tile_color 0x7171c600
 label "just for testing,\nI plugged the mat into the uv to check the
quality of the image.\n(obviously for realworld shot, it would just be a
roto or paint, not the entire image)"
 note_font_size 12
 selected true
 xpos 7256
 ypos -6502
 bdwidth 668
 bdheight 572
}
push $cut_paste_input
Dot {
 name Dot170
 selected true
 xpos 7817
 ypos -6419
 hide_input true
}
NoOp {
 name mmCAMERA4
 selected true
 xpos 7783
 ypos -6398
}
set Nfe724ef0 [stack 0]
Dot {
 name Dot175
 selected true
 xpos 7894
 ypos -5987
 hide_input true
}
push $Nfe724ef0
push 0
Project3D {
 inputs 2
 name Project3D2
 selected true
 xpos 7640
 ypos -6398
}
Card2 {
 translate {740 -15 499.9987793}
 rotate {-90 90 0}
 uniform_scale 2000
 control_points {3 3 3 6

1 {-0.5 -0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666865 0} 0 {0 0
0} 0 {0 0 0}
1 {0 -0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666865
0} 0 {0 0 0} 0 {0.5 0 0}
1 {0.5 -0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666865 0} 0 {0 0
0} 0 {1 0 0}
1 {-0.5 0 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0.1666666716 0} 0 {0
-0.1666666716 0} 0 {0 0.5 0}
1 {0 0 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0.1666666716 0} 0
{0 -0.1666666716 0} 0 {0.5 0.5 0}
1 {0.5 0 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0.1666666716 0} 0 {0
-0.1666666716 0} 0 {1 0.5 0}
1 {-0.5 0.5 0} 0 {0.1666666865 0 0} 0 {0 0 0} 0 {0 0 0} 0 {0 -0.1666666865
0} 0 {0 1 0}
1 {0 0.5 0} 0 {0.1666666716 0 0} 0 {-0.1666666716 0 0} 0 {0 0 0} 0 {0
-0.1666666865 0} 0 {0.5 1 0}
1 {0.5 0.5 0} 0 {0 0 0} 0 {-0.1666666865 0 0} 0 {0 0 0} 0 {0 -0.1666666865
0} 0 {1 1 0} }
 name Card1
 selected true
 xpos 7640
 ypos -6350
}
Dot {
 name Dot217
 selected true
 xpos 7674
 ypos -6323
}
set Nfe6c1350 [stack 0]
Constant {
 inputs 0
 channels {rgba.red rgba.green rgba.blue none}
 format "2048 2048 0 0 2048 2048 1 square_2K"
 name Constant19
 label "square 2K"
 selected true
 xpos 7360
 ypos -6285
}
ScanlineRender {
 inputs 2
 projection_mode uv
 output_motion_vectors_type accurate
 MB_channel forward
 name UV_MAP2
 selected true
 xpos 7510
 ypos -6249
}
push $Nfe6c1350
Dot {
 name Dot236
 selected true
 xpos 7784
 ypos -6235
}
ApplyMaterial {
 inputs 2
 name ApplyMaterial8
 selected true
 xpos 7750
 ypos -6086
}
Constant {
 inputs 0
 channels {rgba.red rgba.green rgba.blue none}
 format "2253 1188 0 0 2253 1188 1 --OBL_DCI_2k (+10%)"
 name Constant20
 label "2K 10% OverScan"
 selected true
 xpos 7568
 ypos -6026
}
ScanlineRender {
 inputs 3
 ztest_enabled false
 output_motion_vectors_type accurate
 MB_channel forward
 name CAM_RENDER8
 selected true
 xpos 7750
 ypos -5990
}

<<attachment: after_uv_unwrap.png>>

<<attachment: original_plate.png>>

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