Pixellated red/blue titles - workaround?

AtticusLake

AtticusLake

Well-known member
I've been trying to figure out why some of my titles are coming out super-pixellated, and I think I've narrowed it down to the colour -- red or blue titles, when exported to H.264, come out super-pixellated. Green, cyan and white titles are fine. Sounds nuts, but here's an example:


Pixillated.png

Here it is scaled up 5x WITHOUT interpolation:

Pixillated 5x.jpg

This is a single text object with just the colour changed on each character.

This is not visible while editing, or if I export the sequence as a PNG image set. It IS visible with titles generated in Premiere's titler, and also with titles made in AE and imported into PP.

So it seems to be an effect of the H.264 encoding; however, I've tried both the built-in H.264 encoder and X.264, and got the same result in both.

Any ideas? Can I avoid this (without changing my colour scheme)? The titles I want (darkish red) look super-ugly right now.
 
Razz16mm said:
It is the resolution of red/blue channels in 4:2:0.
Click to expand...

Well, yeah, but... looking at that 5x image (for some reason it's clearer on my PC than in this post) the pixels on the edge of the A are in 2x2 blocks, where each block of 2x2 is LIGHTER or DARKER as a whole than the ones around it... whereas the chroma isn't changing from one to the other. (The pixels within each 2x2 block also have varying lightnesses, but not by much.)

So shouldn't the key factor be the luminance resolution, which should be 100% -- not the chroma resolution?
 
AtticusLake said:
Well, yeah, but... looking at that 5x image (for some reason it's clearer on my PC than in this post) the pixels on the edge of the A are in 2x2 blocks, where each block of 2x2 is LIGHTER or DARKER as a whole than the ones around it... whereas the chroma isn't changing from one to the other. (The pixels within each 2x2 block also have varying lightnesses, but not by much.)

So shouldn't the key factor be the luminance resolution, which should be 100% -- not the chroma resolution?
Click to expand...

Try encoding to a high grade codec, at least 4:2:2 and see the difference.
 
Yup, WMV doesn't have the issue. So I'm sure you're right, but I still don't really get it... seems to me that the luminance resolution should be what matters here, and should be able to produce a smoother edge.
 
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