convert from gray to color..

convert from gray to color..

• B-me

  In RGB model with 8 bit for each component there is only 256 true greyscale colors. If you add more of some color component, then resulting color will be not grey, it will be closer to that color component (R, G or B).

  Discovery paint it by hands. This is the tehnique. They simply use something like Photoshop Magic Wand to select areas on screen and assign color to that areas. When Chaplin makes his movies he do not use color, there was no equipment to capture color.

  
  
  

• Bidmaron

  I'm sorry, but it's not possible. Unless you store color version somewhere before.

  When you convert to grayscale, you loose color information, so you can't restore it.

  This movies was painted, this is really possible, but it was made by hands, someone have to sit and tell to computers that grass are green and blood are red.

  This is some abstract sample:

  You have color Red-Green-Blue as 3 bytes. After conversion you have only 1 byte of grey level (it will be actually 3 bytes with same values inside). How you can you restore 3 bytes from 1 byte

  If Red=Green=Blue then color is greyscale.

  
  
  

• StephanLotter

  they didn't use RGB, but we do. RGB is primary model of color in PC. For printers there is CMYK models. For professional graphics sometimes used HLS models. Try search MSDN for "color spaces" it have descriptions of details (http://msdn.microsoft.com/library/default.asp url=/library/en-us/icm/icm_2lo3.asp).

  Anyway, greyscale is subset of full colors range. You can't restore from subset to full range without extra information.

  
  
  

• Abdul Abu

  is it
  
  if you can create a image from color to grayscale isnt that reversible
  
  i saw movies on Discovery from world War 2 converted into color.. so its possible
  
  
  

• VBRookie

  Yes, it have. But not reverse.

  Let play with colors, you have 3 RGB bytes, this is 256*256*256 = 16777216 colors possible. Now lets remember that color is greyscale when it's Red == Green == Blue. So you have only 256 greyscale colors possible.

  As you can see you can convert 16777216 colors to 256, but you can't restore from 256 colors almost 16 millions of them. Greyscale conversion is conversion with information losing. Just like JPEG algorithms, you can convert pefect large picture to very small (and ugly ) image, but you can't restore it after that.

  One more notice - White is equal mix of Red, Green and Blue. If you make more Blue than Green and Red, then color becomes a little more blue, not greyscale.

  
  
  

• Eindhoven

  man...
  
  they didnt use that alogoritm red=yellow=blue ... just that their cameras cant record color..
  
  so their camera was getting each color and transform it to a grayscale value..
  
  is there anything besides RGB .. like more colors
  
  
  

• Ryan K

  Hi!

  You mean simply change gray to red tones (add a little to the red in each pixel)

  Or you want to restore all colors (it's impossible)

  
  
  

• weoili

  nop ..
  
  i heard that every color has his brother in grayscale..
  
  
  

• celeon

  " you have 3 RGB bytes, this is 256*256*256 = 16777216 colors possible. Now lets remember that color is greyscale when it's Red == Green == Blue. So you have only 256 greyscale colors possible."
  
  guess you are right on this one.. but how did they managed om the discovery channel to color.. with exact color those old Movies.. with WW2 Charlie Chaplin.. Stan Bran..
  
  it must be a tehnique..
  
  but why just 256 color of gray... i bet they are more..
  
  
  
• convert from gray to color..