Search found 332 matches

by Din
Fri Sep 23, 2022 8:53 am
Forum: Optics
Topic: Color proximity copies ?
Replies: 2
Views: 3677

Re: Color proximity copies ?

Yes. This is a full colour H2 from a full colour, single H1 (not 3 separate H1's) we shot about 7 years ago. The subject matter is the holographic joke referring to the Utah Teapot. The first test of a computer graphic, 3D algorithm used a teapot as a test. The Utah teapot is considered the "Hello W...
by Din
Sat Sep 17, 2022 2:55 pm
Forum: Beginning Holography
Topic: Where to buy heatsink?
Replies: 2
Views: 257

Re: Where to buy heatsink?

We had a 315M. My wife bought a brick-sized block of aluminium, drilled holes in it and screwed the laser on. You need to insulate the aluminium and laser with some heat sink paste. Aluminium is better than steel, since it's easier to drill into. We also made DCG holograms, and our home-made heat si...
by Din
Wed Aug 24, 2022 1:32 pm
Forum: Off Topic
Topic: New 3D display with a new type of lens
Replies: 0
Views: 442

New 3D display with a new type of lens

3D Image.jpg
3D Image.jpg (371.36 KiB) Viewed 442 times
by Din
Tue Jun 28, 2022 12:33 pm
Forum: Optics
Topic: A heuristic approach
Replies: 1
Views: 731

A heuristic approach

I just got this. I think it provides a good heuristic approach to holography, albeit not as analytic as the coupled wave approach.
layered media.jpg
layered media.jpg (13.69 KiB) Viewed 731 times
by Din
Wed Apr 27, 2022 2:24 pm
Forum: Off Topic
Topic: Deep learning applied to holography
Replies: 0
Views: 1324

Deep learning applied to holography

Machine vision recognition of holograms is apparently difficult due to speckle and noise. This paper applies deep learning techniques for holographic recognition by machine vision.
AI_Hoolography.jpg
AI_Hoolography.jpg (340.44 KiB) Viewed 1324 times
by Din
Tue Apr 19, 2022 10:20 am
Forum: Off Topic
Topic: NASA 'holoported' doctor to ISS
Replies: 0
Views: 355

NASA 'holoported' doctor to ISS

https://www.nasa.gov/feature/innovative ... ts-healthy

"This was the first holoportation handshake from Earth in space."
by Din
Fri Apr 08, 2022 1:42 pm
Forum: AgX
Topic: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates
Replies: 11
Views: 2158

Re: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates

The curve in the post above is not exactly the true picture, as it is a graph of relative sensitivity, not absolute, unlike this curve, from Agfa Technical Information Bulletin 21.7271(688)LI, the rest of the bulletin available here: http://edweslystudio.com/Materials/AgX/Agfa/Holotest217271688.PDF...
by Din
Wed Mar 23, 2022 8:54 am
Forum: AgX
Topic: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates
Replies: 11
Views: 2158

Re: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates

Hi Jody Have you tried exposing the old red sensitive plates to green laser light? Obviously they don't have the correct dyes to be sensitive to green but given modern green lasers are fairly powerful I wonder if the emulsion would respond anyway? John, I think that the red emulsion would respond t...
by Din
Sun Mar 20, 2022 5:45 pm
Forum: AgX
Topic: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates
Replies: 11
Views: 2158

Re: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates

Hi Jody, a few years ago I had exactly the opposite problem: red Agfas (more than 20 years old) worked perfectly, while the green ones were completely dead. Petr Petr's observation makes me think it could be caused by random events. If so, this could be due to double random walk ("drunkard's walk")...
by Din
Fri Mar 18, 2022 9:02 am
Forum: AgX
Topic: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates
Replies: 11
Views: 2158

Re: Using a 660nm laser to expose legacy AgX Agfa, Ilford, HRT (BB) plates

thanks Din, so if the dye because age or heat becomes bleached, why not just dye it again there by restoring the dyes ability to transfer energy to the silver? mm nice info :P I suppose you could. This was brought up recently. I think you'd have to choose your dye carefully; it must take in the las...