7D Dual ISO Photo How to do ?

[Walter Schulz]

Okay, now I see something.

First file is a Dual ISO file. Naming fits and it is recognized by CR2HDR and processed.
Second file is *not* a Dual ISO file. Naming fits to Canon's standard file naming and it is not recognized as Dual ISO file by CR2HDR.

And your problem is?

Ciao, Walter

[jman]

Please help !!! I've downloaded the cr2hdr exe from the 1st page of the dual iso forum. I set the menus on the 7d properly and took 2 photos. When I drag the first photo into cr2hdr all I get is a tmp notepad file with nothing in it. What is going on ??

[Walter Schulz]

You have dcraw in the same directory?
If yes: Create a new directory in the root of c:, name should contain no blanks, only letters (a-z) and/or numbers. Copy files there and try again.

Ciao, Walter

[jman]

Hello Walter...Thanks....I made a new folder in the root of C named abc with all three files in the folder. The two cr2 files are on my desktop. I dragged the cr2 file to the exe and same thing just a tmp notepad file. When I dragged the file to the exiftool it popped up a command prompt and wrote for about 2 seconds and disappeared. Is there a link to the newest version of cr2hdr that I am missing? Sorry for being a pest. Cheers...John

[jman]

Walter...didn't realize the cr2 files had to be in the same folder. It works now....Thanks.

[ThLDQ]

Me again.
I tried dual-iso once more.
1. Interlaced picture

Input file     : DUAL1627.CR2
Full size      : 5360 x 3516
Active area    : 5202 x 3465
White level    : 13481
Black borders  : 158 left, 51 top
Black level    : 1955
ISO pattern    : dBBd GBRG
Noise levels   : 5.02 19.34 21.84 4.88 (14-bit)
Estimating ISO difference...
ISO difference : 4.05 EV (1658)
Interpolation  : mean23-chroma5x5-alias
Dynamic range  : 11.21 (+) 9.04 => 13.10 EV (in theory)
Matching brightness...
Full-res reconstruction...
ISO overlap    : 4.2 EV (approx)
Half-res blending...
Chroma filtering...
Building alias map...
Filtering alias map...
Smoothing alias map...
Noise level    : 3.88 (16-bit)
Dynamic range  : 13.54 EV (cooked)
Black adjust   : -2
Output file    : DUAL1627.DNG

No problem

2. Alternates frames only "ON"
So I shot twice and got two DUAL pictures.

Input file     : DUAL1628.CR2
Full size      : 5360 x 3516
Active area    : 5202 x 3465
White level    : 13482
Black borders  : 158 left, 51 top
Black level    : 1954
ISO pattern    : dBBd GBRG
Noise levels   : 4.91 19.56 21.42 4.82 (14-bit)
Estimating ISO difference...
ISO difference : 4.05 EV (1656)
Interpolation  : mean23-chroma5x5-alias
Dynamic range  : 11.22 (+) 9.07 => 13.12 EV (in theory)
Matching brightness...
Full-res reconstruction...
ISO overlap    : 4.2 EV (approx)
Half-res blending...
Chroma filtering...
Building alias map...
Filtering alias map...
Smoothing alias map...
Noise level    : 3.82 (16-bit)
Dynamic range  : 13.56 EV (cooked)
Black adjust   : -2
Output file    : DUAL1628.DNG



Input file     : DUAL1629.CR2
Full size      : 5360 x 3516
Active area    : 5202 x 3465
Doesn't look like interlaced ISO

Even if it is a dual-iso picture, it is not processed.

Thierry

[a1ex]

Yeah, the file name may not be synced properly if you press the shutter too fast, so don't rely on that.

[jman]

After reading the main thread I thought I would ask if this is the correct workflow.
1. Set Dual iso at 100 1600 alternate frames on.
2. Take 2 pics. In preview 100 iso is dark and 1600 iso has the lines running through. Pics were taken in Liveview.
3. I take the 2 cr2's and put them in the folder with cr2hdr dcraw and exiftool.
4. I then take the cr2 with the lines on it and drag it into cr2hdr. This creates a dng file which I then open in photoshop camera raw and adjust.
IS THIS CORRECT ??

[a1ex]

5. if the result has too much aliasing / details lost / whatever other problem, use the cr2 without lines as backup.

[jman]

Thank you very much a1ex. Just needed to know that the workflow was correct. I will try the 100 iso with cr2hdr also. Is that what you mean as backup ? Cheers. John.

[a1ex]

LOL, just edit it normally.

You can also use 1600/100 if you want the normal shot (and the LiveView image) to cover the shadow areas and clip the highlights.

I'll change the default to 100/800, so try using that. It has a better balance between shadow noise and lost detail.

[jman]

Cheers a1ex.