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Forum Index : Microcontroller and PC projects : CMM2 Colour Quandary
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Chopperp Guru  Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Hi Back here I mentioned that my RGB(brown)'s were a lot redder. No comments were made so I just left it. Just downloaded & installed b23 & results the same. Browns virtually indistinguishable from Red so RGB(Brown) is of no use to me. What I did try was an RGB(ORANGE), which although not documented, gave me a sort of an orangey/browny colour, a bit darker than yellow. So I changed all my COLOUR RGB(BROWN) statements to COLOUR RGB(ORANGE) & I'm back to where I was (almost) with colours a few months ago. (The the reason I tried RGB(ORANGE) was that I had CONST ORANGE = RGB(255, 128, 1) defined & inadvertently typed in COLOUR RGB(ORANGE) instead of COLOUR ORANGE & got a result).Apart from the BROWN not being a Brown, I was wondering why RGB(ORANGE) works. Brian. ChopperP |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
There are a few colours that haven't made it into the manual yet. Current colours are: #define BLACK RGB(0, 0, 0, 0) #define BLUE RGB(0, 0, 255, 15) #define GREEN RGB(0, 255, 0, 15) #define CYAN RGB(0, 255, 255, 15) #define RED RGB(255, 0, 0, 15) #define MAGENTA RGB(255, 0, 192, 15) #define YELLOW RGB(255, 255, 0, 15) #define BROWN RGB(0xA5, 0x2a, 0x2a, 15) #define GRAY RGB(64, 64, 64, 15) #define LITEGRAY RGB(128, 128, 128, 15) #define WHITE RGB(255, 255, 255, 15) #define ORANGE RGB(0xff, 0xA5, 0, 15) #define PINK RGB(0xFF, 0xA0, 0xAB, 15) #define GOLD RGB(0xFF, 0xD7, 0x00, 15) #define SALMON RGB(0xFA, 0x80, 0x72, 15) #define BEIGE RGB(0xF5, 0xF5, 0xDC, 15) #define NOTBLACK (VideoColour==8? RGB(0,32, 0,15): (VideoColour==12? RGB(16,16,16,15): RGB(0,4,0,15))) The colours used seem to be taken from the HTML colour chart. There are lots of different Browns and you can always roll your own to suit your monitor. With 8 bit modes, the range of colours is limited. 16 bit gives a good differentiation GREY or GRAY are the same and LIGHTGRAY and LIGHTGREY both are LITEGRAY internally. Jim Edited 2021-04-01 12:28 by TassyJim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
OK, Thanks Jim. Good too know. Glad I asked. Brian ChopperP |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 490 |
You might like to watch this nice video on BROWN!! It explains a lot about our perception of colors. This guy has some very intriguing videos. It seems like a good brown needs a little finesse in RGB space with orange. https://www.youtube.com/watch?v=wh4aWZRtTwU Just got a new Video in my feed on RGB color in general. https://www.youtube.com/watch?v=uYbdx4I7STg Edited 2021-04-01 15:22 by mclout999 |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
@mclout999. Very interesting video. Thanks. @TassyJim. Yes different monitors display colours differently which can be annoying. Also interested if anyone else's Brown changed or is it just me? Brian ChopperP |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2170 |
then there's this... https://www.youtube.com/watch?v=wh4aWZRtTwU (great channel btw) |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 490 |
This is the same link as the one I posted? |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
@Brian, It might be worth checking your video R2R networks. If one bit is missing or shorting, it might cause what you are seeing. The simplest way to check it is with my testcard program https://www.c-com.com.au/mmhelp/testcard.htm The 3 primary colours should all increase in brightness going across the screen. Any discontinuity will indicate a fault with the circuit. Jim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Thanks Jim Will give it a go later on today. Brian. ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
OK, had a bit of a play with the monitor. About the best I could get it. It was worse. Conversion to JPG makes it appear a bit worse than it is. Brown & Red still much the same. Great test card... Brian OOPS Just realised that the IMAGE saved may be NOT what is on the screen... . Edited 2021-04-02 11:31 by Chopperp ChopperP |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
Correct. But if you view the saved image in Windows paint etc and compare it with what you see on your monitor, they should be close to the same. also try 16 bit for a check of the full R2R network Jim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Got around to playing with Jim's Test Card program on my other CMM2 running a wide screen monitor. Also read the instructions on how to use it...duh Re-adjusted the monitor settings to give a better picture. Found that depending on what angle you look at the screen determines to some extent what colours are seen. If I got the right angle, RGB(BROWN) did look OK. Interesting going through the various modes & resolutions on the CMM2. Hadn't done that before. (No need to). Mode 11.16 looks good. Will re-check the other CMM2 one day soon. Thanks again Jim. ChopperP |
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