On Tue, Dec 21, 2010 at 8:26 PM, Christopher Wright < christopher_wri...@apple.com> wrote:
> Does this mean that when color correction is on, one is running the image > through colorsync? So, one could run through needless stages of color sync > (?). > > > It just tags the image with a colorspace so that down-stream things can > correct if necessary. It doesn't convert anything, just adds metadata. > > Ahhhh, ok, it's just adding (or removing) color profile metadata. Thanks, that makes sense to me. > 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 > > This is what I was driving at about filtering; what happens when something > isn't aligned.... > > GL filtering? Is this literally "GL Filtering"? > > > Yes. As in, you read pixel 0.5, 0.5. That's 0.25 * pixel(0,0) + 0.25 * > pixel(0,1) + 0.25 * pixel(1,0) + 0.25 * pixel(1,1). > > or (pixel(0,0) + pixel(0,1) + pixel(1,0) + pixel(1,1)) / 4, if you please. > > So let's say pixels (0,0) and (1,1) were white(1.0), and pixels (0,1) and > (1,0) were black(0.0). That's a 2x2 black and white checkerboard. > > The above GL filtering will proudly do the most complicated memory fetch in > history (texel fetches + filtering = holy cow that's a bunch of work), and > then return 0.5 (half white, half black). > Hmm, that could actually be really useful. Good to note. -- George Toledo gtole...@gmail.com www.georgetoledo.com The information contained in this E-mail and any attachments may be confidential. If you have received this E-mail in error, please notify us immediately by telephone or return E-mail. You should not use or disclose the contents of this E-mail or any of the attachments for any purpose or to any persons.
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