### Author Topic: remaining stripes after cr2hdr postprocessing (5DmkIII ISO 100/6400, auto ETTR)  (Read 2100 times)

#### Botannik

• New to the forum
• Posts: 3
##### remaining stripes after cr2hdr postprocessing (5DmkIII ISO 100/6400, auto ETTR)
« on: April 26, 2016, 08:52:35 AM »
Dear ML-experts!
Your help is needed. I was having some fun doing a holy grail timelapse with ETTR and auto dualISO, which adapted ISO to be as high as 6400/100 in certain frames. I know this is a rather big dualISO difference, though I had no control over that, since it was automatically set by the ETTR function.

The trouble I encounter is with postprocessing: Whenever cr2hdr processes a frame that has a 6400/100 ISO difference the resulting frame still has some stripes not unlike the original dualISO frame, amd I can't figure out how to fix this.

Has anyone encountered a similar issue?

#### a1ex

• Hero Member
• Posts: 10704
• 5D Mark Free
##### Re: remaining stripes after cr2hdr postprocessing (5DmkIII ISO 100/6400, auto ETTR)
« Reply #1 on: April 28, 2016, 05:50:44 PM »
Upload a CR2 (one that shows the worst artifacts, if possible).

#### Botannik

• New to the forum
• Posts: 3
##### Re: remaining stripes after cr2hdr postprocessing (5DmkIII ISO 100/6400, auto ETTR)
« Reply #2 on: May 01, 2016, 12:42:49 AM »

This is a link to my Dropbox with all the files of one of the timelapse frames with 100/6400 ISO. I passed it through the cr2hdr debug function, so there are also all intermediate .dng files.
The 8H5A1511.CR2 is the original and the 8H5A1511.DNG is the standard output from cr2hdr.exe

Here is the debug log:
Code: [Select]
`C:\Users\******\Desktop\cr2hdr_co>cr2hdr "F:\5DmkIII\Timelapse\2016-04-20_SG Moonrise Rooftop\8H5A1511.CR2" --debug-blendcr2hdr: a post processing tool for Dual ISO imagesLast update: ab1e90c on 2015-11-24 09:50:19 UTC by a1ex:cr2hdr: moved safeguard from median_int_wirth to kth_smallest_i...Active options:--amaze-edge    : use a temporary demosaic step (AMaZE) followed by edge-directed interpolation (default)--cs2x2         : apply 2x2 chroma smoothing in noisy and aliased areas (default)--wb=graymax    : set AsShotNeutral by maximizing the number of gray pixels (default)--debug-blend   : save intermediate images used for blending:    dark.dng        the low-ISO exposure, interpolated    bright.dng      the high-ISO exposure, interpolated and darkened    halfres.dng     half-resolution blending (low noise, high aliasing)    fullres.dng     full-resolution blending (minimal aliasing, high noise)    *_smooth.dng    images after chroma smoothingInput file      : F:\5DmkIII\Timelapse\2016-04-20_SG Moonrise Rooftop\8H5A1511.CR2Camera          : Canon EOS 5D Mark IIIFull size       : 5920 x 3950Active area     : 5796 x 3870Black borders   : 124 left, 80 topBlack level     : 2024ISO pattern     : BddB RGGBWhite levels    : 15166 13864Noise levels    : 51.26 6.90 7.47 67.37 (14-bit)ISO difference  : 6.00 EV (6400)Black delta     : -11.96Black adjust    : -72Dynamic range   : 10.89 (+) 7.46 => 13.46 EV (in theory)Looking for hot/cold pixels...Hot pixels      : 456Cold pixels     : 1562AMaZE interpolation ...Amaze took 2.34 sEdge-directed interpolation...Semi-overexposed: 6.45%Deep shadows    : 92.38%Horizontal stripe fix...Full-res reconstruction...ISO overlap     : 3.0 EV (approx)Half-res blending...Chroma smoothing...Building alias map...Filtering alias map...Smoothing alias map...Final blending...Noise level     : 579.06 (20-bit), ideally 48.36Dynamic range   : 10.50 EV (cooked)Black adjust    : 56AsShotNeutral   : 0.44 1 0.95, 8641K/g=1.41 (gray max)Output file     : F:\5DmkIII\Timelapse\2016-04-20_SG Moonrise Rooftop\8H5A1511.DNGF:\5DmkIII\Timelapse\2016-04-20_SG Moonrise Rooftop\8H5A1511.DNG: copying EXIF from F:\5DmkIII\Timelapse\2016-04-20_SG Moonrise Rooftop\8H5A1511.CR2`
Thank you!

#### Botannik

• New to the forum
• Posts: 3
##### Re: remaining stripes after cr2hdr postprocessing (5DmkIII ISO 100/6400, auto ETTR)
« Reply #3 on: May 16, 2016, 10:52:49 PM »
Upload a CR2 (one that shows the worst artifacts, if possible).

Hi A1ex, there's a thing I realised: in debug mode, the halfres (halfres_smooth.dng and halfres.dng) files seem to look just fine... But I guess there is some kind of downside to this, maybe like a loss in resolution?

Do you think I can just use those rendered "debug"-frames? And is there a way of batch-rendering them from some 100 .CR2-frames?