September Challenge: Photograms

Question

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)

Answer 1

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:

Answer 2

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

Answer 3

Usually: higher density -> less light transmission -> less exposure -> less Ag↓ -> brigther

like x-Ray

Answer 4

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 )

Answer 5

Final version without litdev extension:

program: RPT439

Answer 6

This is my solution for this challenge: MRT132.

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

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Nonki Takahashi

Answer 7

Nonki, Cool Photogram !!