Karim D. Ghantous
Well-known member
Let me second Terry's assessment here, and qualify the original comment with a big; wat..?!
-- peer
Once again I have been vague in what I was trying to communicate. Okay, let's try it again! My point was that an 8K sensor would be perfect for a 4K master file because each cluster of photosites can be combined - not just for luminance but for chrominance. Here's a typical 2x2 cluster of photosites:
|BG|
|GR|
Each 2x2 cluster can easily downsampled to one output pixel. It's not like dividing 4 by 5 or 10 by 3. It divides neatly. So 8K can neatly and cleanly be downsampled to 4K. But what about colour? Well, instead of debayering a 5K output, then downsampling to a 4K file, you can just combine the colour values (obviously not just simple adding) and the result will be the RGB value for that pixel.
So according to what I know about sensor design and sampling algorithms (not much otherwise I'd be working for RED) it's much simpler and cleaner to downsample and combine to half-res than it is to debayer alone. And because you aren't debayering you don't have yucky artefacts.
Prove me wrong... and I'll shout you a (nice) coffee!