Thread-topic: Preserving alpha channel in BMP to GWorld?
Does the imageImporter subtype that you are using support alpha. I'd imagine that a default bmp importer would not enforce an existing alpha. My ยข.02
-p
-----Original Message-----
From: quicktime-api-bounces+parisman=email@hidden [mailto:quicktime-api-bounces+parisman=email@hidden] On Behalf Of Jim Wintermyre
Sent: Saturday, December 18, 2004 5:01 AM
To: email@hidden
Subject: Preserving alpha channel in BMP to GWorld?
Hi -
I have some BMP format data which contains an alpha channel. I am
trying to load this image into a 32-bit GWorld (created with
NewGWorld), and preserve the alpha channel in the upper byte of each
pixel. At some later point I would then draw this GWorld using the
alpha channel using DecompressImage() with one of the alpha transfer
graphics modes. I've got the BMP graphics importer set up and
drawing the image into the GWorld using GraphicsImportDraw(), but it
doesn't preserve the alpha channel. Is there something special I
need to do to get it to copy the alpha channel as well as the RGB
data into the GWorld?
Thanks,
Jim
_______________________________________________
Do not post admin requests to the list. They will be ignored.
QuickTime-API mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quicktime-api/email@hidden
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
QuickTime-API mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quicktime-api/email@hidden
This email sent to email@hidden
