> When one sends an image to a Billboard, with or without some kind of Core > Image processing, and native core image is or isn't enabled on the pixel > aligned Billboard, then one places all of this inside of a Render In Image > patch set to 32bit, what is the color correction special setting on the > Render In Image doing? > > Does the color correction work differently depending on bit depth? Do these > settings have interplay? If pixel alignment isn't chosen, is some kind of > filtering going on, or vice versa?
Pixel Aligned does exactly one thing: it ensures that the resultant quad is drawn on pixel boundaries (it rounds off slight X/Y position values). it doesn't affect filtering or color correction intrinsically (though read on for a detail). Color correction maps values from a source profile to a target profile. Whether you have 4 bits or 64 bits of precision, it doesn't matter; you'll just have more or less precision. http://developer.apple.com/library/mac/#technotes/tn/tn2035.html If Pixel Aligned is _NOT_ enabled, you'll also add GL filtering (unless Native Core Image rendering is enabled) if your position is not pixel aligned -- GL doesn't properly blend with respect to gamma, so you'll get brightness shifts (not color shifts that are characteristic with color mis-correction). The amount of this filtering is a function of how mis-aligned your billboard is. _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
