PERL Miscellaneous - How to change the brightness or apply transperency to a part/ an image?

Author

How to change the brightness or apply transperency to a part/ an image?

Oliver Bleckmann

2005-11-23, 6:58 pm

Hi,

short question:

Im using GD to generate some gif's.
How do i change all colors within a certain area of the image -
e.g. rise the brightness.
Perhaps there is a way to rotate the pallet or draw a transparent white
layer (background color) over the area, which creates this effect? Or
multiply two images, or whatever...
I have to create some color gradations, but cannot use a fill method,
because there's no way to determin
the position of the objects. finally a new object is drawn, the image is
written, an the next time the program starts,
the process starts again. So these obects fade out afer x turns.

Oliver Bleckmann

2005-11-28, 7:56 am

"Christian Winter" <thepoet_nospam@arcor.de> schrieb im Newsbeitrag
news:43859cec$0$27884$9b4e6d93@newsread4
.arcor-online.net...
> Did you try the copyMerge method (in particular the percent value for
> opacy)?

Yes, thats what I do now, but it would be fine to manipulate the colors
(e.g. rotate them)...

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