August 20, 2017, 12:40:01 AM

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51
EOS Bodies - For Stills / Re: Histogram question regarding clipping
« Last post by sulla on August 19, 2017, 10:39:53 AM »
I read so many people talking about file bit-depth as if it is linked to dynamic range, but it isn't, right?
Indeed, you are right. And actually an 8 bit JPG can cover about 11 stops of dynamic rage, as the mapping of brightness to bit-value is non-linear, but a gamma-curve.
I was sloppy with my wording. I somehow implied that high-dynamic-range image formats come in higher bit depths.
What I should have said was: The histogram should cover the whole dynamic range of the image data. It does neither in Canon cameras nor in LR, which is sad.
52
Landscape / Re: Flowers and other Flora
« Last post by rpt on August 19, 2017, 10:36:57 AM »
Nice series, rpt.  :)
Thanks :)

The small flowers were 4 to 5 mm across. Unfortunately I had not taken my macro lens. Next time I'll remember to take it.
53
Reviews / Re: Petapixel: 6D vs 6DII, high ISO
« Last post by SecureGSM on August 19, 2017, 10:34:26 AM »
1dx 18Mp , no DPAF vs 1dx II 20Mp /w DPAF.  1dx II wins.


there is no example of an identical camera, one with and the other without dual pixel, to compare between....
But we have the EOS 750D (T6i) and the EOS 800D (T7i) which both have 24.2 effective megapixels. Those might be the closest thing we have to see the difference in High ISO performance, has somebody looked at both and done a comparison? Because it has been stated multiple times that Dual-Pixel Technology has some disadvantages on IQ, but I haven't seen any proof.
54
5DS and 5DS R Sample Images / Re: Any thing Shot with a 5ds/r
« Last post by Phenix205 on August 19, 2017, 10:20:59 AM »
Moraine Lake, Banff National Park.
Handheld, 16-35L f4 IS, 24mm, 1/160, f11, ISO 200.
55
Reviews / Re: Petapixel: 6D vs 6DII, high ISO
« Last post by Joules on August 19, 2017, 10:14:10 AM »
there is no example of an identical camera, one with and the other without dual pixel, to compare between....
But we have the EOS 750D (T6i) and the EOS 800D (T7i) which both have 24.2 effective megapixels. Those might be the closest thing we have to see the difference in High ISO performance, has somebody looked at both and done a comparison? Because it has been stated multiple times that Dual-Pixel Technology has some disadvantages on IQ, but I haven't seen any proof.
56
EOS Bodies - For Stills / Re: Histogram question regarding clipping
« Last post by Joules on August 19, 2017, 10:07:30 AM »
In LR this is also strange: If you export to JPG, an  8 bit histogram is ok, but if you export to 16 bit or if you edit an image, the histogram should be accurate.
Why would a 16 bit histogram differ from an 8 bit one in terms of clipping? Would it differ at all?

I read so many people talking about file bit-depth as if it is linked to dynamic range, but it isn't, right? The bit-depth is just a number indicating the highest value a pixel of a given color could have (256 for 8-bit and 65536 for 16-bit). But a higher value doesn't have to mean a higher brigthness, that's a matter of how that value is interpreted. And the lowest value - 0 - should be treated as black, the highest - 256 / 65536 - as white. That's the same range of brightness levels, so the same dynamic range, just the amount of steps in between differs.

I do a bit of programming and plan to tackle a little image editor soon, so if I'm mistaken here, that would be helpfull to know.

Perhaps ist has something to do with calculation power of the processor not being sufficient for histogram calculation form RAW, but then, this is not such a difficult process either.
The processors in Canon cameras can do a lot more than they do. As said before, the firmware addon Magic Lantern actually has a raw histogram that also shows the percentage of clipped pixels per color channel, as well as a raw spotmeter and raw zebras. All of it works perfectly fine on my T3i, even though it only has the old Digic 4 chip.

I would love to have ML come to some of the newer cameras at some point. Having it on a 6DII or 80D would certainly be cool.
57
EOS Bodies - For Stills / Re: Histogram question regarding clipping
« Last post by sulla on August 19, 2017, 09:59:50 AM »
I am sorry, but I have to make a slight adjustment to your statement.
yes, you can tell reliably if your clipped highlights or not.
how:
[...]
Indeed...
esp. method 4 allows for an exposure even without any camera metering...  ::)
So I correct: "there's no (straightforward) way to tell from a Canon Histogram whether your're clipping..."

The suggestion of using ML is a good one, actually.
58
EOS Bodies / Re: The EOS M10 Replacement Will be the EOS M100
« Last post by AvTvM on August 19, 2017, 09:59:20 AM »
Yep. I get it.  Let's be concerned what what it is called and not what what it will do.

+1

exactly. Always amazes me how many forum users here are "obsessed" with Canon naming/numbering schemes etc. rather than focussing on functionality and competitiveness of Canon imaging products.
59
Landscape / Re: Flowers and other Flora
« Last post by Click on August 19, 2017, 09:58:06 AM »
Nice series, rpt.  :)
60
Animal Kingdom / Re: Show your Bird Portraits
« Last post by Click on August 19, 2017, 09:56:48 AM »
Headed to Alaska last November, for the week after the Bald Eagle festival - luckily we had a real mix of weather, including some days where there was a great big dump of snow - I also spent some time in Alaska during July, again eagles, but with the addition of bears & whales ... & orca! I'm hoping to head back there again during 2019

I really like your shot. Well done David.
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