$ cat scale.txt

a500 image geometry

Setup a 4:3 screen to work with, any 4:3 resolution will work fine

Scaling
 resolution: 1152x864
 aspect ration: CRT TV(1)
 integer scaling: yes
 lock aspect ratio: yes


Crop border
 Crop for each side manually (6)

 Generic Crop Settings
  NTSC LowRes 320x200
  crop_left:45
  crop_right:19
  crop_top:24
  crop_bottom:11

  PAL LowRes 320x256
  crop_left:45
  crop_right:19
  crop_top:19
  crop_bottom:61


Method:

 1.) Review NTSC footage from real amiga here 
  - https://www.youtube.com/watch?v=HSujirmsrzQ
  - https://www.youtube.com/watch?v=D5hiwB7lzk8
 2.) Switch Denise amiga to NTSC model
 3.) Boot Defender of the Crown, match ingame screens
 4.) Grab scan of back box art for Defender of crown, compare
     screenshot
 5.) Capture screenshot of amiga insert disk screen on pre-cropped
     NTSC Denise config
 6.) Compare PAL insert disk screen to NTSC capture, overlaying
     in GIMP to establish PAL crop values

Notes:

- why CRT? amiga native res is 320x200 NTSC and 320x256 PAL, 
  running native on amiga makes scaling impossible in the current 
  version of Denise or you can have squased output, your choice. 
  CRT modifies the output for 4:3(?)

- meant to be generic config, some things will need specfic cropping 
  of their own


Testing
  NTSC LowRes 320x200
    - Defender of the Crown
  PAL  LowRes 320x256
    - Shadow of the Beast