Author Topic: Canon 100D / SL1  (Read 241939 times)

bouncyball

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Re: Canon 100D / SL1
« Reply #975 on: January 17, 2018, 09:39:00 AM »
I guess Switch uses focus pixel fix by default. If focus pixel map is applied it produces phantom focus pixel artifacts all over the image. I guess it's because of this image has so many vertical curtain lines with contrasty transition.

IDA_ML

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Re: Canon 100D / SL1
« Reply #976 on: January 17, 2018, 09:51:48 AM »
Hello Dfort,

As you requested, I have now shot another Movie Crop Mode (MvCM) file of yesterday's high-contrast scene in the 8 ... 11 bit losslessly compressed mode but this time without Dual ISO.  To make sure, you have exactly the same camera settings and do not compare apples with oranges, I have shot also the same scene in Dual ISO 100/800.  For your comparison, I am providing also another pair of clips shot at 14-bit lossless with and without Dual ISO, respectively to check and see if the bitrate of the LL compressed videos has an influence on the focus pixels and the Dual ISO behavior.  All 4 clips were recorded at the following camera settings:

         F9,1; 1/50s and basic ISO 100, (100D, EF 24/2,8 IS, Oct. 23-rd, 2017 build)

You can download the archive (634 MB) with the 4 clips in the next 7 days from here:

https://we.tl/5h1L5IHogQ

I am sorry, I was unable to shorten the clips.  As I explained above, shortening with MLV_dump produced corrupt frames.

Happy testing!

bouncyball

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Re: Canon 100D / SL1
« Reply #977 on: January 17, 2018, 10:01:17 AM »
I hate 'wetransfer.com'. When speed surpasses 8mb/sec download always stops and, the ugliest thing is, it can not be resumed. Tried 20times already to no avail...

IDA_ML

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Re: Canon 100D / SL1
« Reply #978 on: January 17, 2018, 10:36:10 AM »
I am sorry to hear that.  I don't have this problem since speed rarely exceeds 2-3 MB/s here.  Could you suggest another site for uploading files that does not have this speed issue? 

Danne

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Re: Canon 100D / SL1
« Reply #979 on: January 17, 2018, 10:44:48 AM »
I guess Switch uses focus pixel fix by default. If focus pixel map is applied it produces phantom focus pixel artifacts all over the image. I guess it's because of this image has so many vertical curtain lines with contrasty transition.

What´s the correct workflow here when it comes to dualiso MLV files?

bouncyball

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Re: Canon 100D / SL1
« Reply #980 on: January 17, 2018, 01:27:47 PM »
What´s the correct workflow here when it comes to dualiso MLV files?
I have no idea :P

But in this particular case fixing of not existent focus pixels is an enemy.

Danne

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Re: Canon 100D / SL1
« Reply #981 on: January 17, 2018, 02:38:34 PM »
I see, we are discussing lossless 8-12 bit files not 14bit? So simply disabling fpm files for lower bits might do the trick.

bouncyball

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Re: Canon 100D / SL1
« Reply #982 on: January 17, 2018, 03:10:24 PM »
I am sorry to hear that.  I don't have this problem since speed rarely exceeds 2-3 MB/s here.  Could you suggest another site for uploading files that does not have this speed issue?
IDK, google drive always worked for me.

IDA_ML

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Re: Canon 100D / SL1
« Reply #983 on: January 17, 2018, 04:20:19 PM »
Bouncyball,

I have just uploaded the package with the Movie Crop Mode MLVs onto another storage server called "tranzit".  Here is the download link, active for 120 hours:

http://tranzit.dir.bg/load.php?id=WktUhR9ZqKqj6rXE3016921

It will prompt you to type a distorted 4 symbol code into a box and then you have to click on the blue line to start the download.  Please let me know if you succeeded.



 

bouncyball

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Re: Canon 100D / SL1
« Reply #984 on: January 17, 2018, 04:32:46 PM »
That worked, thx :)

dfort

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Re: Canon 100D / SL1
« Reply #985 on: Yesterday at 04:42:24 AM »
Quick report.

I can't get the 8...12bit Dual ISO isn't working with MLVFS or mlv_dump/cr2hdr. The normal shots worked fine but are quite underexposed.



Looks like maybe the 2-pass map isn't needed on the 100D mv1080crop 8...12bit? Hard to tell with this test because there are so few focus pixels showing up.



Here's the 14bit lossless Dual ISO after playing around with it. Recovered lots of shadow detail but it is a bit noisy. No focus pixels, though.



Well, almost. There were a few along the edges that persisted.



By the way, earlier I was getting lots of focus pixels. When testing out MLVFS I often pull out the fpm files to see the focus pixels. Guess what? I forgot to put them back.  ::)

All fine now!
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

IDA_ML

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Re: Canon 100D / SL1
« Reply #986 on: Yesterday at 03:56:05 PM »
Thank you for your feedback, Dfort.  Well, it does not look all that bad at all.  I am very happy to see that there is no aliasing on the Dual ISO 14-bit shot which may make the Movie Crop Mode quite usable with Dual ISO.  Yes, the shot is quite noisy but keeping in mind the extreme contrast this scene was shot at and how much you had to push the shadows to recover detail, I think, noise is to be expected.   

As far as underexposure with the 8...11 bit LL files is concerned, their exposure settings were the same as with the 14-bit ones.  They look underexposed on the screen due to the lower bit rate but in fact, they are normally exposed.  If you try to bring them to normal exposure in ACR you will see that their noise levels are about the same as with the 14-bit LL.  When I shoot videos at 8...11 bit LL, I trust much more the histogram than the dark image on the screen.

dfort

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Re: Canon 100D / SL1
« Reply #987 on: Yesterday at 05:36:22 PM »
Sorry, I meant that all of the shots were underexposed. You're far from clipping the highlights.



This is what the Dual ISO histogram looks like before processing:



I'm not an expert at exposing Dual ISO but this looks underexposed to me.

Focus pixel fixing seems to be working, though maybe the 100D doesn't need the 1-pixel offset pass that the 700D needed. What would really help is shooting that test pattern @theBilalFakhouri used. It is still available on his Google Drive from the link in his post.

The main issue here is that cr2hdr isn't processing your 8...12bit Dual ISO shot.
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IDA_ML

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Re: Canon 100D / SL1
« Reply #988 on: Yesterday at 05:50:22 PM »
Dfort,

Do you mean the file PIXEL SCANNER V4.mp4?  Should I play it on my computer screen and record it from there?  In which mode should I do that - normal uncropped, Movie Crop, 5x-Crop, Dual ISO or something else?

dfort

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Re: Canon 100D / SL1
« Reply #989 on: Yesterday at 06:53:58 PM »
@theBilalFakhouri detailed how he did it but even if you just put the camera on a tripod and shoot it off your computer screen it should work.

Every video mode at every bit rate and compression setting would be best but right now what I'm most interested in are mv1080crop and 5x zoom -- the 1:1 sampling video modes using 8...11bit, 12bit and 14bit lossless compression.

Don't bother testing Dual ISO with the test pattern. We know there is a problem but it shouldn't affect the focus pixels.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

IDA_ML

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Re: Canon 100D / SL1
« Reply #990 on: Yesterday at 10:50:56 PM »
All right, I'll see what I can do.

canneloni

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Re: Canon 100D / SL1
« Reply #991 on: Yesterday at 11:34:16 PM »
I shot the test pattern in different modes on the 100D. (8...11 Bit lossless, 12 Bit lossless each in mv1080, mv1080moviecrop, mv1080_5xZoom). The settings used were f4, shutter 1/50th, ISO 200 and manual WB at 6100 Kelvin (WB adjust with PushWB from shortkey menu in liveview) exposure was measured as about 1 stop underexposed.

If this is usefull to anyone you can download it here:

https://drive.google.com/open?id=11RJPTv3pQpRpDSfLCild9BL8XGh1D8xX

Edit: I used the build IDA linked in this post. I was not able to record continuously with the above settings and even got some errors when i tried to record 14 bit lossless. Had to restart the camera after i tried. 
100D.100B ; Canon 18-55 STM ; Canon 50 1,8 II ; Canon 75-300 4,0 - 5,6 III ; Sigma 17-50 2,8

dfort

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Re: Canon 100D / SL1
« Reply #992 on: Today at 12:58:26 AM »
Great test @canneloni !

I need to take a closer look but right away look at the psychedelic display of focus pixels on mv1080:



Compared to mv1080crop -- without fixing the focus pixels:



Thanks for this.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103