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September Challenge: Photograms RRS feed

  • General discussion

  • Here is a suggestion for September Challenge :

    A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed through transparent or semi-transparent objects appear grey

    Wikipedia: https://en.wikipedia.org/wiki/Photogram

    We used to make photograms in high school , in the photography courses.

    Now, i propose to simulate this effect in Small Basic !

    here is a photogram by  William Henry Fox Talbot ( near 1860)






    • Edited by YLedEditor Wednesday, August 24, 2016 11:54 PM title retouch
    Sunday, August 21, 2016 8:16 PM
    Answerer

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  • Here is my version for Photogram challenge.   INVERSE PHOTOGRAM

    Note: my algorythm is to slow, it take 10 minutes to do this simple photogram without litdev extension.

    plain Small Basic version: XZF965  (process time 10 min.)

    with litdev extension the time process will be surely under 1 minute, let me make a litdev photogram sample

    version with litdev WWG532  (process time 1/4 sec.)

     

    with litdev extension  result:



    • Edited by YLedEditor Saturday, September 3, 2016 12:44 AM INVERSE PHOTOGRAM
    Friday, September 2, 2016 4:17 PM
    Answerer
  • INVERSE PHOTOGRAM

    Here is a full litdev extension version but not good for monthly challenge.

    Fantastic litdev extension, it load 5 images , and make a photogram in a finger snap !!!

    Program:  FSP814


    • Edited by YLedEditor Saturday, September 3, 2016 12:45 AM INVERSE PHOTOGRAM
    Friday, September 2, 2016 7:53 PM
    Answerer
  • Usually: higher density -> less light transmission -> less exposure -> less Ag↓ -> brigther

    like x-Ray

    Friday, September 2, 2016 10:45 PM
    Answerer
  • REAL PHOTOGRAM

    here is a more realistic look of a silver photogram:

    object put on the silver bromide photographic paper block light, while where is no objects, the light hit the photographic paper and expose it , development turn the exposed part to black silver. To keep the image, image must be fix, usually in a 3rd bath call fixer.

    Some part ,like leaves, are more transparent, so we can see some grays values.

    program: PHF453  ( with litdev extension )



    • Edited by YLedEditor Saturday, September 3, 2016 12:47 AM
    Saturday, September 3, 2016 12:43 AM
    Answerer
  • Final version without litdev extension:

    program: RPT439


    • Edited by YLedEditor Wednesday, September 14, 2016 1:38 PM
    Wednesday, September 14, 2016 1:37 PM
    Answerer
  • This is my solution for this challenge: MRT132.

    Screen shot of a program Photogram 0.1

    Original photo is http://www.nonkit.com/smallbasic.files/PhotoForPhotogram.jpg .

    Screen shot of the original photo


    Nonki Takahashi

    Sunday, September 18, 2016 2:55 PM
    Moderator
  • Nonki, Cool Photogram !!

    Sunday, September 18, 2016 4:10 PM
    Answerer