Topic awaiting preservation: calculating the average of two hex colors? (Page 1 of 1)

mhmm....anyone knows how to do this? i always did the PS layer hack, with setting the upper layer's visibility to 50% but i have heard that the result isn't correct if you do it this way....any advices?

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#^2*(2x+45,041^2xyß/15*87F= OMG! i was hoping that it would be easier though
thx InI, i will try to understand that

is there also a way to calculate this without getting back to decimals?

You could use: http://www.meyerweb.com/eric/tools/color-blend/

mas: The PS layer hack works. At worst it can bring some rounding error, but who cares if your color are fooled of 256th of tint ?

If you don't want to use decimal or complex calculations, you can use a calculator supporting hexadecimal ( like Microssoft's one when set in 'scientific mode' in the 'Display' options ). The method consist in using 16:16 Fixed Point. It may sound complex but it's not. Take a real world example :

1. color 1 = CF93E5
   
   color 2 = FF6E8C
2. now insert some 'void' between the shade ( to give enough bits for the Fixed Point )
   
   color1fp = CF009300E5
   
   color2fp = FF006E008C
3. add the color1fp and color2fp in your calculator
   
   colorSummedFp = 1CE01010171
4. Divide colorSummedFp by 2
   
   colorDividedFp = colorSummedFp / 2 = E7008080B8
5. Finally remove the 'voids' ( the Fixed Point bits ) we've added in the step 2.
   
   colorAverge = E780B8

And voilà. This very method should work even if you wish to average 65536 colors.
To double check, here comes the resulting colors obtained with the PS layer hack :
color1 + 50% of color2 = E780B8
color2 + 50% of color1 = E781B9 The difference is *hardly* visible.

[EDIT] The Color Blender @ meyerweb gives E781B9 [/EDIT]

Hope that didn't scared you

Mathieu "POÏ" HENRI

[This message has been edited by poi (edited 10-12-2003).]

thx for your input poi
oh and thx for the link, HZR

[This message has been edited by mas (edited 10-12-2003).]

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InI: Just done it

:FAQ: How do you calculate the average of two (or more) colours?

___________________
Emps

The Emperor dot org

I might be stupid, but can't you do this using the windows calculator?

Switch mode to scientific, choose Hex and then just calculate away?

I wouldn't know ^^^
But I do know that my TI-89 does it. And binary too.
And I was working on a program to convert dec/bin/hex to octal

-Xel

The poster has demanded we remove all his contributions, less he takes legal action.
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Now Tyberius Prime expects him to start complaining that we removed his 'free speech' since this message will replace all of his posts, past and future.
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Nimraw: That's not stupid, and that's one of the reasons why I said:

quote:

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...you can use a calculator supporting hexadecimal ( like Microssoft's one when set in 'scientific mode' in the 'Display' options )...

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Mathieu "POÏ" HENRI

doh!