Welcome to TalkGraphics.com
Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1

    Question Subtractive color overlap?

    Is there some function in Xtreme / Designer, so that when I place two objects on top of each other, then their colors are mixed according to the subtractive color model?

    Example: blue circle on top of yellow circle = green circle

  2. #2
    Join Date
    Mar 2007
    Location
    ...Granada province, Andalucia, Spain
    Posts
    5,302

    Default Re: Subtractive color overlap?

    Applying a stained glass transparency will do it.
    Bob.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	stained glass.png 
Views:	288 
Size:	5.9 KB 
ID:	88569  
    ** Detailed "Create A Spinning Logo Tutorial" is available in .pdf format for download at this link **
    Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. Groucho Marx.

  3. #3
    Join Date
    Nov 2000
    Location
    Red Boiling Springs TN USA
    Posts
    19,208

    Default Re: Subtractive color overlap?

    Stained Glass Transparency is good for subtractive colors and Bleach Transparency is good for additive colors.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	colour_models.gif 
Views:	328 
Size:	14.6 KB 
ID:	88577  
    Soquili
    a.k.a. Bill Taylor
    Bill is no longer with us. He died on 10 Dec 2012. We remember him always.
    My TG Album
    Last XaReg update

  4. #4

    Default Re: Subtractive color overlap?

    Thanks - works! I already found out about bleach for additive colors.

    And I have to correct myself: cyan + yellow = green, blue + yellow = (cyan + magenta) + yellow = black

  5. #5
    Join Date
    Apr 2011
    Location
    Hungary, Poland
    Posts
    1,265

    Default Re: Subtractive color overlap?

    I also thanks this is very interesting topic :-)

    Bill, basically how did you do these circles in steps? Because somehow for me came out differently The stained glass transparency should be set on 50%?

    Click image for larger version. 

Name:	color_mix.jpg 
Views:	265 
Size:	24.1 KB 
ID:	88584

  6. #6

    Default Re: Subtractive color overlap?

    Quote Originally Posted by csehz View Post
    The stained glass transparency should be set on 50%?
    0%

  7. #7
    Join Date
    Apr 2011
    Location
    Hungary, Poland
    Posts
    1,265

    Default Re: Subtractive color overlap?

    Ah okay thanks :-) And that by myself found out that on the second picture that is why the background is black, because that makes visible the original colours as black + 0% bleach transparency

    Click image for larger version. 

Name:	Colors.jpg 
Views:	301 
Size:	19.7 KB 
ID:	88586

    Simple playing but very interesting, like in the school a little bit, but that time did not have such professional program to play

  8. #8
    Join Date
    Nov 2000
    Location
    Red Boiling Springs TN USA
    Posts
    19,208

    Default Re: Subtractive color overlap?

    Looks like you sorted the bleach transparency (additive) colours.

    If anyone is interested in a bit of explaination.

    The Black background is used for the additive example because the lack of light is black. Adding the primary coloured lights Red, Green, and Blue they combine to become other colours with all colours making White.

    In a similar manner begin with a White background and subtract colours Cyan, Magenta, and Yellow, which eventually removes all colours to reveal Black.

    Artist using pigments for paints are more familiar with the Primary pigments Red, Yellow, and Blue which work similar to subtractive colours of light. Although you get a muddy brown rather than a Black.
    Soquili
    a.k.a. Bill Taylor
    Bill is no longer with us. He died on 10 Dec 2012. We remember him always.
    My TG Album
    Last XaReg update

  9. #9
    Join Date
    Aug 2000
    Location
    Placitas, New Mexico, USA
    Posts
    41,486

    Default Re: Subtractive color overlap?

    Stained Glass transparency makes white totally transparent. Bleach transparency makes black totally transparent.

    In the attached example, I applied 0% Bleach transparnecy to the black overlay which makes the black totally transparent but retains some of the color from the overlay image. The darker the bottom image, the more intense the overlaid colors. If the background is lighter, the overlay colors will also get lighter.

    In the second example I placed a rainbow colored overlay over a black drawing with white outlines. 0% Stained Glass applied to the colored overlay does not affect the black on the bottom but adds the color to the white outlines.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	bleach.jpg 
Views:	243 
Size:	119.2 KB 
ID:	88592   Click image for larger version. 

Name:	stanied glass.jpg 
Views:	240 
Size:	43.6 KB 
ID:	88593  

    Last edited by gwpriester; 06 April 2012 at 01:54 PM.

  10. #10
    Join Date
    Nov 2000
    Location
    Red Boiling Springs TN USA
    Posts
    19,208

    Default Re: Subtractive color overlap?

    Great examples Gary. And they are stereograms!
    Soquili
    a.k.a. Bill Taylor
    Bill is no longer with us. He died on 10 Dec 2012. We remember him always.
    My TG Album
    Last XaReg update

 

 

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •