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#16
08-08-2006, 10:46 PM
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Here's a more complete site,showing "Dufaycolor" advertised as late as 1949 - it's not clear to me if it was still the same additive process by that date.
http://website.lineone.net/~mauricef...ufaycolor.html A Google search will turn up examples of the images obtained from the original additive film. 
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#17
08-26-2006, 05:11 PM
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There is some good information about "Simplified Mexican Color TV" in a two page article with drawings and a partial TV set schematic by Associate Editor Leslie Soloman, published in Electronics World, July, 1964, pages 48 and 71.
The article describes the color system being broadcast by XHGC-TV, Mexico City, using a two color disk spinning synchronously on each monochrome camera to make 60 interlaced fields, 30 orange and 30 cyan. The partial TV schematic indicates the set was an NTSC color set [NTSC color circuitry not in use for this system] with a standard 3 gun CRT, but with an added electronic switch to select which color was being scanned onto the CRT. The swtch turned on either the 'red' gun or the 'blue and green' guns together at the field rate to make a color picture. I have the original article and will scan it and make a .pdf to post if anyone is interested. Cliff
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#18
08-26-2006, 05:38 PM
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IF anyone is interested?
 Post it, please please please...BTW, if AK woh't let you post high-res scans, please PM me for my email address
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#19
08-27-2006, 02:46 PM
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Cliff sent me the scans as pdf files, which he had trouble uploading. Here they are as jpegs, cut into pieces small enough to meet AK limits but still readable
Thanks, Cliff!
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#20
08-27-2006, 03:43 PM
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BTW, it seems silly that there are limits on the image dimensions and file size you can post, but you can cut it up into pieces that total more than the original and the files will be accepted. Any comments from an administrator, please?
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#21
09-01-2006, 04:42 AM
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http://www.earlytelevision.org/mexican_color.html
Hi, I like this mexican system. The interesting question is: How does a colour picture looks like compared with the three colour system  .Our VGA monitors are RGB and so it is possible to connect G and B. This is the same result as connecting the kathodes of a picture tube. I made a little two colour VGA adapter. So I am able to see the three colour picture without adapter and two colour with adapter.  I made some screenshots for you. The mexican system is better than expected. If you don't know the original you will accept it  .Kind regards, Darius
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#23
09-01-2006, 12:07 PM
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Quote:
http://www.bairdtelevision.com/colour.html http://www.sydenham.org.uk/john_logie_baird_03.html There is some material about two-color television on the web. See http://www.sptv.demon.co.uk/bairdcolour/ and when I have enough time, I will update my scanning disk televisor with color. Kind regards, Eckhard[von nebenan]
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#24
09-01-2006, 10:13 PM
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I made a little two colour VGA adapter. So I am able to see the three colour picture without adapter and two colour with adapter.
Kind regards, Darius[/QUOTE] The pictures are quite good. That is an ingenius adaptor you built. Would you write a short explanation of the computations you used to design it? Regards, Cliff
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#25
09-01-2006, 10:25 PM
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Wow !! All this is fascinating...Imagine what would have happened if the War hadn't intervened...We'd had color by '46, 1950, anyway...maybe the networks would have been "all-color" by 1960, instead of half-a-decade later...Britain, Germany, France, Australia would have had color concurrently w/us...Who knows ?
__________________
Benevolent Despot
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#26
09-02-2006, 03:44 AM
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Good morning,
the first pic in #21 showes the schematic. You need a male (computer side) and a female (monitor side) vga connector. 1=Red 2=Green 3=Blue 6,7,8,9,10=Ground 13=H sync 14=V sync. Make a short circuit between pin 2 and pin 3 at the monitor side. Connect green directly and blue via 330Ohms and red via 47 Ohms. This gives mexican two colour. In the pictures attached you can see the black cable comeing form the computer than a gender changer and the white cable goes to the monitor. I took screenshots of a landscape in Gran Canaria picture 5. The flowers look a bit poor in two colour because with red and cyan you can not get all colours. Note the bluejeans of the people in picture 2. It is not blue any more. But as toled before, if you don't know the original you'll accept it.Interesting experiment, try it out .Kind regards, Darius
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#27
09-07-2006, 09:53 PM
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Thanks for the posts. The flesh tones are a little too red for my taste, but a few resistors could probably couple a little red into green to move faces a little more toward orange.
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#28
09-07-2006, 10:10 PM
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Here are some illustration of the original color, color with Q channel disabled (Y+I) and with I channel disabled (Y+Q).
Copyright Wayne Bretl - please do not repost, but direct people to this post.
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#29
09-07-2006, 10:41 PM
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I'm *supposedly* colorblind. FWIW here's what the blind man sees:
Despite Wayne's caption, it's the picture on the far right that's original color. The center picture overall looks very natural to my eyes, though I can see by the colorbar that yellow has become beige...or parchment.... The left picture is definitely not acceptable. It looks like a black & white photo that somebody started to hand color, but got interupted before they could start on the fleshtones.
__________________
tvontheporch.com
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#30
09-08-2006, 08:50 AM
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Quote:
this is not mexican colour. You wrote copyright do not repost. Is it allowed to pose the pics in mexican colour here? I made some screenshots of your pic in three and two colour and in red and cyan only. Kind regards, Darius
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