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How to draw a bitmap with Alpha values preserved in CGContext?

Subject: How to draw a bitmap with Alpha values preserved in CGContext?
From: Marc Van Olmen <email@hidden>
Date: Wed, 28 Jun 2006 19:22:55 -0400
Delivered-to: email@hidden
Delivered-to: email@hidden

hi.

Now that Apple says we need to use CG and no more GWorld...
I'm trying to figure this one out:

Take this Apple sample software:

http://developer.apple.com/samplecode/ImproveYourImage/index.html

And this sample image:

<http://www.sky4studios.com/sample.zip>
An alpha channeled image.

It has 2 ways to draw: QT way and CG ways.

QT Way is they way I want obtain.

When it is drawing with CG in CGContext, it applies the Alpha value to the 3 RGB colors and so doesn't preserve the full 32-bit ARGB pixel colors.

Is there away to fix this with CG?

thx, looked into doc for 2 hours and thought that's too long so must be something tricky..

regards,

marc

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References:
	>QTKit or Quicktime API for frame analysis (From: "Kevin" <email@hidden>)

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