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How to export palettes

Rolf Fankhauser

September 17, 2015 15:29

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Hi all,
Is it possible to export palettes (*.smp) in a readable form (ascii, csv, excel)? If not, I would like to make a small program in Delphi to output the palette as csv (Fields: Value, R, G, B).

Thanks! Rolf

P.S. I use Idrisi Taiga

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2 comments

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  Tammy Woodard, Clark Labs September 18, 2015 16:14

  Hi Rolf,
  We accidentally deleted your message about using the API's CallPick. If you repost that question, I will reply to it. In the meantime, I will research the answer to this question.

  Tammy Woodard
  Clark Labs

• 1
  
  Tammy Woodard, Clark Labs September 18, 2015 16:39

  For an .SMP file, there is an 18 byte header:

  1. bytes 1-8: '[IDRISI]'
  2. byte 9 : 1 (refers to the platform)
  3. byte 10 : 10 (version #)
  4. byte 11 : 8 (bit_depth)
  5. byte 12 : 18 (header size)
  6. byte 13 & 14 : 255 (max index in the palette - data type is Word; this number can vary)
  7. byte 15 & 16 : AutoScaleMin, data type = word.
     
  8. byte 17 & 18 : AutoscaleMax, data type = word.
     

  Then for each palette index (from 0 to maxindex, without skipping) do a 3-byte sequence:
  red value (1-byte)
  green value (1-byte)
  blue value (1-byte)

  The palette index is not stored, but is implied by the order.