Re: FLASH: that darned RGB problem

[John Dowdell]

Sorry, I didn't catch the previous parts of the thread... I read the recent

post but wasn't sure why my name was inserted in the title. (If this is a

wishlist request, then mailing to

wish-flashmacromedia [dot] com

 can reach the

folks who make the tool, thanks.)


Are you trying to convert color representations? If so, then Gary Grossman

offers two bitwise manipulations which can help... here are fragments from

two messages, for both sides of the task:



>RE: technique to create a hex for RGB?

>

>What you want is

>

>RGBValue = (rv<<16) | (gv<<8) | bv;

>

>Each value from 0 to 255 is an 8-bit byte, or 8 binary digits.

>

>A hex RGB color of the form #XXXXXX is a 24-bit quantity,

>or 24 binary digits.

>

>The << operator shifts quantities by the specified number of bits.  Here,

>it's used to shift each 8-bit byte into the proper position in the 24-bit

>whole.




>> Would you guys happen to have a recipe for extracting red, green,

>> and blue from c.getRGB() using bitwise shifting, or do I just have

>> to go the old-fashioned way and use substrings?

>

>r = (rgb >> 16) & 0xff;

>g = (rgb >> 8)  & 0xff;

>b = rgb & 0xff;




I haven't had the chance to work in this area before, but did some quick

tests this afternoon, with much happiness. I agree that it would be great

to get this stuff documented... will be working on a technote with an easy

intro to some of this stuff, thanks.



Tip: The front section of the ActionScript Dictionary contains the

non-alphabetical entries, and there's _all types_ of fascinating stuff in

there....  ;-)



jd






John Dowdell, Macromedia Tech Support, San Francisco CA US

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