CODEWITHSUNDEEP
actionscript-3
Marcelo Noronha
Marcelo Noronha

Reputation: 815

How to create a bitmap from another bitmap

Let´s say I have a bitmap with 3 colors: red, green and blue (not mixed)

What if I wanted to make a bitmap of the red part of the first bitmap?

I´d like to take the red pixels from first bitmap (and its positions), and make another bitmap.

Is that possible?

Upvotes: 0

Views: 133

Answers (2)

Igor Milla
Igor Milla

Reputation: 2786

As and addition to solution posted by shanethehat, I will point you to this amazing class called - colormatrix, written by SO user quasimondo. It gives you more efficient way to work with channels in the action script. And if you are going to work with bitmap and graphics in general you can checkout the Quasimondo Libs from google code repository.

Upvotes: 2

shanethehat
shanethehat

Reputation: 15580

You can use BitmapData.copyChannel() to copy a single channel's color information into a new BitmapData object.

Something like this (untested):

//myBitmap is the source bitmap
var oldBMD:BitmapData = myBitmap.bitmapData;
var newBMD:BitmapData = new BitmapData(oldBMD.width,oldBMD.height,true,0);
oldBmd.copyChannel(newBMD, null, null, BitmapDataChannel.RED, BitmapDataChannel.RED);
var newBitmap:Bitmap = new Bitmap(newBMD);

Upvotes: 3

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