Dual ISO - massive dynamic range improvement (dual_iso.mo)

Started by a1ex, July 16, 2013, 06:33:50 PM

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Braam544

Quote from: daancalo2013 on July 23, 2013, 09:07:16 PM
hello I have a 5d mark 3 and want to know how do I install dual iso, video tutorial please.


- It is a good idea, help us. Por favor chicos ayudarnos ?


nickazg

If you are incapable of searching google on how to install ML, you clearly aren't ready for it.

brapodam

Quote from: daancalo2013 on July 23, 2013, 09:07:16 PM
hello I have a 5d mark 3 and want to know how do I install dual iso, video tutorial please.
I'm not going to make a video tutorial because I don't feel it's needed, plus I don't have a 5D3.

Anyways (5D3 users please correct me if I'm wrong, I don't have a 5D3).
1. Follow the instructions in this thread to install ML http://www.magiclantern.fm/forum/index.php?topic=2602.0
2. After you're done doing all those stuff, download everything here: https://www.dropbox.com/sh/xiksvwbehzmycq4/QbuV17WuE5 (I just linked this from the first post in this thread)
3. Replace autoexec.bin on your SD card with the one you downloaded in step 2
4. Create a folder under the ML folder on the SD card, and call it "modules" (without the quotation marks)
5. Copy everything else you downloaded from step 2 into that folder

Audionut

There are some video tutorials here too http://www.magiclantern.fm/forum/index.php?topic=6099.0

I've updated the dropbox folder with the latest build.

@a1ex, with auto shadow recovery enabled in photo LV, ML menus become laggy.

dubzeebass

It is looking WAY BETTER a1ex!  I am really impressed with the quality... however the vertical line problem is back.  I've edited the picture below for clarity and if you look closely at the video in 1080p you'll see the lines in the upper-right corner.  Image full-size is here: http://postimg.org/image/j93dgsinh/




dubzeebass

I am just BLOWN AWAY by the extra Dynamic Range for still photography.  Wow!


dubzeebass

Quote from: Audionut on July 24, 2013, 02:05:05 AM
@a1ex, with auto shadow recovery enabled in photo LV, ML menus become laggy.

Audionut I just downloaded the builds you posted and I can't find the auto shadow recovery under the Dual ISO menu.  Any idea?

Audionut

It only works in photo LV.  In dual ISO, hit set on recovery ISO and scroll all the way to bottom.

dubzeebass

One more ... this time comparing 100 to 6400 and then combined.  This was purposefully a very taxing image to capture with two light sources, diagonal lines, and very dark and very light parts of the image.



It can't be stressed enough that this development is groundbreaking and frankly I think a1ex for prez!

Steve Kahn

So is there a difference in dual iso images for still photography vs DNGs?

a1ex

@dubzeebass: for banding, you started the video with a very underexposed image. Banding correction is computed from the first frame only, so if you start from the sky, it should be a lot better.

You may try something really extreme now... maybe a photo from a cave outside? or maybe something like this or this?

dubzeebass

Quote from: a1ex on July 24, 2013, 08:14:40 AM
you started the video with a very underexposed image

What's the best method to ensure both ISOs are picking up the maximum signal without clipping?  Histogram I guess?  I was using the spot meter (%) but I am thinking that may not be good enough.

Audionut

Set your base ISO for highlights (Zebras/Histogram/AutoETTR), and enable the needed recovery (Histogram/Zebras).

dubzeebass

Quote from: Audionut on July 24, 2013, 04:00:20 PM
Set your base ISO for highlights (Zebras/Histogram/AutoETTR), and enable the needed recovery (Histogram/Zebras).

Cheers.  I notice 3 colours in the zebras: white, green, and red.  Red is obv overexposed, white is under ... what does green signify?  Back on topic after I promise!

#a1exforpres

jaybirch

The still images are starting to looking really nice... a bit of edge fringing, but usable

http://postimg.org/image/5s5d2fkx5/full/

Danne

did you try to defringe chromatic abberations in lightroom or another application? I got rid of most of it. It,s a marvellous thing, dual-iso

jaybirch

Yea, that did a very good job of clearing it up. Resized down to 4K (and 2K), it looks pretty much perfect.

http://postimg.org/image/ot17d1ytd/full/

fcpk

would anyone have an archive of the cr2hdr?
The one on first page isn't working with the test pictures I took yesterday. It complains it's not an interlaced file.


Danne

Quote from: fcpk on July 25, 2013, 12:00:01 AM
would anyone have an archive of the cr2hdr?
The one on first page isn't working with the test pictures I took yesterday. It complains it's not an interlaced file.

The "not interlaced" is related to cr2 files that,s not photographed with dual iso I believe. Try a dual-iso file, works splendid

fcpk

I'm pretty sure it is a dual iso, there's clear interlacing in the raw when I preview it, with two different ISO visible

AnotherDave

The dynamic range looks good, but the samples I have seen look pixelated and I wonder what-then is the point of using it at all...

dubzeebass

Quote from: AnotherDave on July 25, 2013, 01:26:38 AM
The dynamic range looks good, but the samples I have seen look pixelated and I wonder what-then is the point of using it at all...

It's a work in progress ... and has already improved by leaps and bounds.  Oh ye of little faith.

Audionut

Quote from: dubzeebass on July 24, 2013, 06:00:43 PM
Cheers.  I notice 3 colours in the zebras: white, green, and red.  Red is obv overexposed, white is under ... what does green signify?

Dotted white is underexposed.  Each other color represents over exposure in that channel.  Black represents over exposure in all channels.