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Messages - a1ex

#8251
1. Try a fixed recovery ISO (not relative).

2. It looks at file number (IMG_1234) and burst is not supported. Once you know that, it's completely predictable.

3. Check if exiftool is working (post a conversion log).
#8252
That shot is just a tricky shot from EOSHD - here's his original rendering: http://www.eoshd.com/uploads/5d3-hdrx.jpg

I can remove the shadow aliasing completely, but right now I'm only cleaning 50% of it, because the noise gets pretty bad. Still lots of room for tweaking (but you need to compile yourself, there are no user parameters yet).

Here's the spot you need to change:


            if (b0 < white && d < white)
                f = MAX(f, c * FIXP_ONE / 2);


change to f = MAX(f, c * FIXP_ONE); to remove all the shadow aliasing, and maybe tweak CONTRAST_MAX to fine-tune stuff.
#8253
@dubzeebass: that was a bug solved a while ago, turn on sync beep if you still use an old version.
@Danne: first cr2hdr, then dcraw.

I have some major updates to the interpolation algorithm. It's too late here to post nice comparisons and stuff, but you can do that for me.

Basically, this update gets the noise levels from the original samples in out-of-focus areas and minimizes aliasing in high-detail areas.

http://acoutts.com/a1ex/shadow/000000.jpg

compare with http://acoutts.com/a1ex/shadow/b.jpg (shadow50) for example
or with http://acoutts.com/a1ex/highlight/b.jpg (highlight blurring)
or with http://acoutts.com/a1ex/shadow/median6.jpg (the first algorithm)

There's no denoising; the algorithm is just selecting the cleaner signal source (ISO 1600) in low-detail areas. There's some slight blurring in aliased highlight areas, but it has no impact on noise (it's only used to reduce the artifacts).

Now I think the algorithm is suitable for some really nice shots (photos+videos), not just aliased keyboards in black caves ;)
#8254
Tragic Lantern / Re: Raw video on 50d and 40d
July 20, 2013, 10:49:01 PM
Nope, not even on 5D3.

To get the same quality, you need to sample the entire sensor at 30fps (without line skipping). I doubt the 50D can do that (just look at the rolling shutter from x5 zoom).
#8255
Tragic Lantern / Re: Raw video on 50d and 40d
July 20, 2013, 09:58:38 PM
We can't break the laws of physics. Read some theory before asking the same things over and over.
#8256
Continue until you get a precise mathematical description of what you said.

Hint: it's 100x more complex than what I did so far.
#8257
Yes, feel free to write down the math for deinterlacing. Alternating ISO is trivial.
#8258
Yes, raw2dng from here is from unified.

Can you upload a short clip?

HDR clips are recognized from the first frame, by computing the ISO difference - so if that frame is dark, it probably won't work.
#8259
Yes, that's the ideal use case. Main subject covered by both ISOs (full detail), highlights and shadows as out-of-focus backgrounds (no aliasing).
#8260
To take stills, press the shutter button, then read the first post. Picture quality should be RAW.

So... you all say it's better to have sharper false detail and aliasing artifacts?

To me, it seems better to have less artifacts, even if the highlights are softer. I've updated the converters with the new algorithm, it should print "mean23-vsmooth3". Can you run some tests?
#8261
Tragic Lantern / Re: Raw video on 50d and 40d
July 20, 2013, 11:46:22 AM
Can't convert that raw file (maybe download issue). What resolution did you use?

(or, better, paste the conversion log from raw2dng - I can recover the metadata from that).
#8263
Nice find!

I guess you want to find the luminance level of the scene, right?

Take the BV value from the expo menu (that is Av + Tv - ISO). When Bv is higher, the scene is brighter. Therefore, you should add the metered value to this.

That quantity would be the X axis on your graph (if you reverse it).

Theory: http://dougkerr.net/pumpkin/articles/APEX.pdf (mirror: http://acoutts.com/a1ex/APEX.pdf )
#8265
It's trivial to do, but should I do almost everything?
#8266
For 5D3, you can't remove the bootflag safely yet.
#8267
What shutter speed did you use for dual ISO?
#8268
It's way too complicated for me.
#8269
http://www.math-info.univ-paris5.fr/~moisan/papers/2010-10r.pdf

Who's going to decipher and implement this?
#8270
Raw Video / Re: Green/Magenta tint in RAW's DNG
July 19, 2013, 01:15:18 PM
In ufraw, without color matrix I get this:


and with color matrix:


(white balance on the white board, near the vertical reflection from top-left of the face)
#8271
Works here. Cache issues when downloading?

Uploaded the same thing with another name: http://acoutts.com/a1ex/raw2dng_whitefix.exe
md5: 3af31ca290c8e4cb3e3013cf134a16f6
#8272
Updated raw2dng.exe in the first post, seems to be OK now.
#8273
I have to align the frames first, and since they contain motion, it's not trivial.
#8274
Upload a short sample. I don't see it in any of my test files.
#8275
General Development / Re: Focus stepping increments
July 19, 2013, 09:08:25 AM
It has 3 - exactly the ones from PTP.

The relationship is not known, but you can try to find it.