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README.md

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Settings that affect scaling:

  • H_WIDTH
    • Defines the size of the horizontal part of the input signal that will be processed
    • Can be used to crop the input signal (in combination with H_POS)
  • V_WIDTH
    • Defines the size of the vertical part of the input signal that will be processed
    • Can be used to crop the input signal (in combination with V_POS)
  • ZOOM_SIZE
    • Zooms uniformely, keeps aspect ratio
    • Does not affect the black bars to the left and right
  • ZOOM_WIDTH
    • Zooms only in horizontal direction, modifies aspect ratio
    • Changes the size of the black bars the left and right
    • Since it scales only in one direction, it can be used to "restore" can be used to restore an aspect ratio that was manipulated by cropping the picture using H_WIDTH and/or V_WIDTH
  • ZOOM_OVERSCAN
    • Shrinks the picture uniformely
    • Introduces a black "letterbox" around the shrunk picture
    • Think of it as the inverse of ZOOM_SIZE

Scaling to full height:

  • (+)
    • Uses as much screen space as possible
    • (Relatively) easy to setup
  • (-)
    • Non-integer scale - pixels are not exactly represented
    • Scanlines look bad (at least on 1080p)
  1. ZOOM ON
  2. set ZOOM_SIZE to 100%
  3. vertical scaling:
    • reduce ZOOM_SIZE until picture fills vertical space
    • modify ZOOM_V_POS to align vertically
  4. horizontal scaling:
    • use H_WIDTH and ZOOM_H_POS until picture is cropped correctly
    • modify ZOOM_WIDTH until aspect ratio is restored (calculate/measure manually, keep non-square pixels of some systems in mind)

Integer scaling:

  • (+)
    • Integer scale - pixels are exactly represented
    • Scanlines look good
  • (-)
    • Either loses some lines in the top/bottom area or has to use a letterbox
    • Hard to setup
  1. Modify VISUAL_SET until picture is cropped correctly
  2. Modify ZOOM_SET and/or ZOOM_OVERSCAN until vertical scale is integer
    • Can use scanlines to verify this
    • May need to go back and slightly modify V_WIDTH to get perfect results
  3. Align picture vertically using ZOOM_V_POS
  4. Modify ZOOM_SIZE until horizontal scale is integer
    • No method to verify this
    • Simply try to achieve the desired aspect ratio (calculate/measure manually, keep non-square pixels of some systems in mind)
  5. Align picture horizontally using ZOOM_H_POS