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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Hd For Indies

graded.JPG
 
I've been hesitant to point some things out about the uncompressed TIFFs but since the can of worms has been opened...

I've seen dead spots (clipped areas perhaps) and noticeable compression. Perhpas in motion, these don't seems as noticeable. I can't argue with the range I've been able to play around with when doing some grades, but looking very carefully at the images, I've seen some things I have questions about.

I'm actually hoping that I'm somehow not looking at the absolute RAW file somehow, maybe there was some artifacting introduced by TIFF?

I was working with the images in Photoshop for what it's worth.

Steve
 
Uncompressed TIFFs don't as far as I know, which is what these were so yeah, i would tend to agree. But I am clearly seeing compression and white blocks in the images.

Just trying to understand what I am seeing. I'll put together some pics to point out what I'm referring to.

Steve
 
im.thatoneguy said:
I made a 'discovery' while doing a sky replacement on the magnum:

RED_Compression_tile.jpg


Compression tiles. Yay!
Click to expand...

That's interesting oneguy. I guess that's an example of the compression algorithm choosing to drop higher frequency data in that one area presumably because of that section of the car and sky having really low detail. It doesn't seem incredibly troubling that it exists that way, but it might have consequences especially when heavily grading moving images. It makes me think that the RAW port might have some real applications when you know the image has to be pushed hard in post.

I'm away from my workstation so I have some questions:

1. How large is each compression tile?
2. Once you have some actual Redcode footage: How far can we push the image in grading before we see some noticable dancing tiles?

By the way, Concrete and Offhollywood. These images look really awesome. It's amazing to think that most of what we've been talking about for the past year has all been "in theory". I like talking about the real thing much better.
Mark great call shooting all white cars.

IBloom
 
PNG of "Problem Area"

PNG of "Problem Area"

Complaining about compression and then posting a JPEG showing the problem area may not be the best solution. Here's a PNG at 100% zoom of the same area pulled from the original 48MB TIFF. The PNG is 1/3 the file size of the this same pictures' TIFF. Does a PNG introduce any new artifacts?

697_1189372756.png


When looking at the raw file at 100% zoom with no adjustments, you can't see any of these compression artifacts. You have to push it very hard to see any tiling. Graeme has pixies working on it, but let's face it, it is not magic. Real compression has to take place somewhere. Considering the 48MB size of a single 4K TIFF frame, the REDCODE RAW data takes up only something close to 1MB for that same single frame. I just hope we will be able to post single frames in the REDCODE RAW format in the future and everyone be able to view them with a free version of REDCINE.

Here's a link to the TIFF: http://www.mediafire.com/?2xbdneo23nz
 
Well it was causing hiccups in my key because the noise profile changes very dramatically on the tile line. (the reason I went looking.)

I can't jump to conclusions but I'm inclined to believe that A) Greenscreens will be the preferable chroma key color and B) Hopefully we'll see a 40MBs 24fps REDCode option when the recording medium can handle it for VFX.
 
These shots were non-optimal - we got waaaaaay better than that. As the week progressed, lots of huddles and sharing of best practices. By the cosmetics shoot, stuff was just STUNNING.

-mike
 
im.thatoneguy said:
Well it was causing hiccups in my key because the noise profile changes very dramatically on the tile line. (the reason I went looking.)

I can't jump to conclusions but I'm inclined to believe that A) Greenscreens will be the preferable chroma key color and B) Hopefully we'll see a 40MBs 24fps REDCode option when the recording medium can handle it for VFX.
Click to expand...

I found more of this 'phenomenon' in the footage Manny just posted:

http://www.reduser.net/forum/showpost.php?p=83130&postcount=9
 
Our compression program continues to evolve. While solving some issues we have introduced some artifacts under certain conditions, but fear not... Graeme has some magic in the works.

Jim
 
Can we deem Graeme The Wizard? I still don't completely understand how he's cramming all that data into that small size to begin with. I guess I do on a basic level, but I don't know the various ingredients in his magic dust.

Look forward to the evolution Jim. I know you want it to be as good as we do. Graeme and the rest of the design team will surely be hearing from the Academy at some point, just takes time.

Steve
 
I just started a new thread by default, but in case you haven't seen it, there's another thread with another 20 or so uncompressed TIFFs you can download.

-mike
 
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