# ST Maps Overscanning **URL:** \ **Category:** Flame Questions\ **Created:** [September 15, 2020, 9:14pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744 "2020-09-15T21:14:33Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![marky753](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/marky753/32/494_2.png) [@marky753](https://forum.logik.tv/u/marky753)\ **Post date:** [September 15, 2020, 9:14pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/1 "2020-09-15T21:14:34Z")
When using ST Maps to undistort, how can pixel info be preserved once the redistort is applied? They get pushed past the perimeter edge on undistort. Need to overscan somehow. Tried using Ls\_UVewa & Action. No joy. ---
**Author:** ![joelosis](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/joelosis/32/72_2.png) [@joelosis](https://forum.logik.tv/u/joelosis)\ **Post date:** [September 15, 2020, 9:32pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/2 "2020-09-15T21:32:02Z")
So action overscan didn’t work in the render node prefs? ---
**Author:** ![hBomb42](https://avatars.discourse-cdn.com/v4/letter/h/bbce88/32.png) [@hBomb42](https://forum.logik.tv/u/hBomb42)\ **Post date:** [September 15, 2020, 9:35pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/3 "2020-09-15T21:35:10Z")
What’s generating the ST Maps? Are you bringing them in as 32fp and using the UVWarp32 matchbox to handle the distortion? ---
**Author:** ![marky753](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/marky753/32/494_2.png) [@marky753](https://forum.logik.tv/u/marky753)\ **Post date:** [September 15, 2020, 9:48pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/4 "2020-09-15T21:48:46Z")
In Action the UV distorts the image past the edges of the surface perimeter. it doesnt compensate and increase the size of the surface. ---
**Author:** ![marky753](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/marky753/32/494_2.png) [@marky753](https://forum.logik.tv/u/marky753)\ **Post date:** [September 15, 2020, 9:52pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/5 "2020-09-15T21:52:54Z")
Coming as part of a matchmove package UD Distort ST maps etc. 32bit yes. UVWarp32 has no overscan functionality as far as I can tell. ---
**Author:** ![joelosis](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/joelosis/32/72_2.png) [@joelosis](https://forum.logik.tv/u/joelosis)\ **Post date:** [September 15, 2020, 10:03pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/6 "2020-09-15T22:03:29Z")
This is how I do my undistort redistort. > **[MYSTPMAP-2020-09-15\_17.56.02.mp4 (video)](https://drive.google.com/file/d/1u11XwqbEwVWxCm8vRyU0ZQMHV3lMlPch/view?usp=drivesdk)** > > Google Drive file. Might not be mathematically perfect etc but works for me ---
**Author:** ![hBomb42](https://avatars.discourse-cdn.com/v4/letter/h/bbce88/32.png) [@hBomb42](https://forum.logik.tv/u/hBomb42)\ **Post date:** [September 15, 2020, 10:17pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/7 "2020-09-15T22:17:18Z")
It doesn’t AFAIK, but the undistort ST map should be large enough to accomodate the overscan. It’ll be bigger than your plate…at least it is with ST maps from PFTrack. Maybe it’s a data window thing in the preprocessing tab of the ST map? ---
**Author:** ![marky753](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/marky753/32/494_2.png) [@marky753](https://forum.logik.tv/u/marky753)\ **Post date:** [September 15, 2020, 10:24pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/8 "2020-09-15T22:24:00Z")
Ah, that makes sense. No, theyre the same res as the plate. Thanks! ---
**Author:** ![marky753](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/marky753/32/494_2.png) [@marky753](https://forum.logik.tv/u/marky753)\ **Post date:** [September 15, 2020, 10:28pm UTC](https://forum.logik.tv/t/st-maps-overscanning/744/9 "2020-09-15T22:28:32Z")
I’ll check that our, thx