Scene luminance has nothing to do with exposure.

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Deleted Removed user

June 26, 2023, 12:18 a.m. June 26, 2023, 12:18 a.m.
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@DonaldB has written:

@JimKasson has written:

@JohnSheehyRev has written:

That's calculable by fixing your conversion or picture style parameters and varying only exposure of a fixed scene, but it is going to vary through the histogram with most histograms, which use gamma or logarithms on the right side, and are more linear on the left.

In the MILC cameras that I've used, the EVF histogram horizontal axis appears to be the tone curve of the JPEG color space selected.

That might be so, but a tone curve only effects the middle of the histogram not the ends.

affects and ...

... hogwash. I'm not even going to bother with an example ... it would be waste of my time ..

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GreatBustard
Members 695 posts

June 26, 2023, 1:33 a.m. June 26, 2023, 1:33 a.m.
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Here's the TLDR version of this thread:

www.reddit.com/r/TikTokCringe/comments/14in2un/why_are_we_arguing_about_how_poor_i_was/

😆😆😆

IanSForsyth likes this.

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DonaldB
Members 2365 posts

June 26, 2023, 2:30 a.m. June 26, 2023, 2:30 a.m.
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@ggbutcher has written:

@DonaldB has written:

@IliahBorg has written:

@DonaldB has written:

@JimKasson has written:

@JohnSheehyRev has written:

That's calculable by fixing your conversion or picture style parameters and varying only exposure of a fixed scene, but it is going to vary through the histogram with most histograms, which use gamma or logarithms on the right side, and are more linear on the left.

In the MILC cameras that I've used, the EVF histogram horizontal axis appears to be the tone curve of the JPEG color space selected.

That might be so, but a tone curve only effects the middle of the histogram not the ends.

Are you familiar with the S-curve? Toe, shoulder?

it doesnt matter as the ends are still locked. same when you adjust curves in PS to gain more contrast.

I think your assertions are locked on the tools you've used. The end control points of the curve tool I use can be slid along either axis...

Even with them set at the far corners, there can be significant effect with slope in the corners. That's the basis of the filmic curve, which has a toe (left end) that starts shallow but almost immediately changes to a steeper slope, far before you can really see it in a curve plot. That's to emulate the so-called "crisp blacks" of film. A good read on it:

filmicworlds.com/blog/why-a-filmic-curve-saturates-your-blacks/

very interesting, great to learn something new, must give it a try Thanks.
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DonaldB
Members 2365 posts

June 26, 2023, 2:31 a.m. June 26, 2023, 2:31 a.m.
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@JimKasson has written:

@DonaldB has written:

when have you ever clipped the ends of a histogram with colours ? because if you have you need to relearn how to take/process an image.

Adobe RGB image histogram

No clipping.

Image converted to sRGB, absolute color:

Lots of clipping on the color channels.

i dont understand what you are showing me.
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DonaldB
Members 2365 posts

June 26, 2023, 2:32 a.m. June 26, 2023, 2:32 a.m.
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@IanSForsyth has written:

@JimKasson has written:

Lots of clipping on the color channels.

Sadly I have a feeling that we need to start from the beginning with Don, the very first is what a histogram represents.
This would probably not work as seen with his refusal to learn and to throw away his preconceived notions on other subjects.

please post some real world images not some hypothetical images that have never won a image competition.
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DonaldB
Members 2365 posts

June 26, 2023, 2:34 a.m. June 26, 2023, 2:34 a.m.
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@xpatUSA has written:

@DonaldB has written:

@JimKasson has written:

@JohnSheehyRev has written:

That's calculable by fixing your conversion or picture style parameters and varying only exposure of a fixed scene, but it is going to vary through the histogram with most histograms, which use gamma or logarithms on the right side, and are more linear on the left.

In the MILC cameras that I've used, the EVF histogram horizontal axis appears to be the tone curve of the JPEG color space selected.

That might be so, but a tone curve only effects the middle of the histogram not the ends.

affects and ...

... hogwash. I'm not even going to bother with an example ... it would be waste of my time ..

thats because you cant take a competition image . and a bit embarressed that you might not be up to standard photography wise.
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IanSForsyth
Members 216 posts

June 26, 2023, 2:38 a.m. June 26, 2023, 2:38 a.m.
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@DonaldB has written:

i dont understand what you are showing me.

It just goes to show that you do not understand what a histogram is showing you, Please look into what a histogram shows you.
You can have clipping in colors that are not close to white.

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DonaldB
Members 2365 posts

June 26, 2023, 2:39 a.m. June 26, 2023, 2:39 a.m.
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@IanSForsyth has written:

@JimKasson has written:

Lots of clipping on the color channels.

Sadly I have a feeling that we need to start from the beginning with Don, the very first is what a histogram represents.
This would probably not work as seen with his refusal to learn and to throw away his preconceived notions on other subjects.

dont flatter yourselves , because you couldnt take a half decient macro to save your life. lets see all the beginners macro images, and dont worry
i can show 100 at this standard.

w788 (2023_04_06 20_18_00 UTC).jpg
JPG, 7.4 MB, uploaded by DonaldB on June 26, 2023.
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DonaldB
Members 2365 posts

June 26, 2023, 2:41 a.m. June 26, 2023, 2:41 a.m.
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@IanSForsyth has written:

@DonaldB has written:

i dont understand what you are showing me.

It just goes to show that you do not understand what a histogram is showing you, Please look into what a histogram shows you.
You can have clipping in colors that are not close to white.

its not an image he took.
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IanSForsyth
Members 216 posts

June 26, 2023, 2:41 a.m. June 26, 2023, 2:41 a.m.
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@DonaldB has written:

please post some real world images not some hypothetical images that have never won a image competition.

I have, I take photographs because I like to take photographs and not based on what other persons like.
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DonaldB
Members 2365 posts

June 26, 2023, 2:45 a.m. June 26, 2023, 2:45 a.m.
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@ggbutcher has written:

@DonaldB has written:

@IliahBorg has written:

@DonaldB has written:

@JimKasson has written:

@JohnSheehyRev has written:

That's calculable by fixing your conversion or picture style parameters and varying only exposure of a fixed scene, but it is going to vary through the histogram with most histograms, which use gamma or logarithms on the right side, and are more linear on the left.

In the MILC cameras that I've used, the EVF histogram horizontal axis appears to be the tone curve of the JPEG color space selected.

That might be so, but a tone curve only effects the middle of the histogram not the ends.

Are you familiar with the S-curve? Toe, shoulder?

it doesnt matter as the ends are still locked. same when you adjust curves in PS to gain more contrast.

I think your assertions are locked on the tools you've used. The end control points of the curve tool I use can be slid along either axis...

Even with them set at the far corners, there can be significant effect with slope in the corners. That's the basis of the filmic curve, which has a toe (left end) that starts shallow but almost immediately changes to a steeper slope, far before you can really see it in a curve plot. That's to emulate the so-called "crisp blacks" of film. A good read on it:

filmicworlds.com/blog/why-a-filmic-curve-saturates-your-blacks/

so you think i cant emulate real blacks in an image. how about you show me one of your masterpeices and see if it compares to mine.

w622 (2023_04_07 07_19_14 UTC).jpg
JPG, 2.4 MB, uploaded by DonaldB on June 26, 2023.
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IanSForsyth
Members 216 posts

June 26, 2023, 2:46 a.m. June 26, 2023, 2:46 a.m.
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@DonaldB has written:

its not an image he took

But it shows you can have clipping.
The sad thing if you want to get snarky is that at this time you can not understand how there can be clipping

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DonaldB
Members 2365 posts

June 26, 2023, 2:47 a.m. June 26, 2023, 2:47 a.m.
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@IanSForsyth has written:

@DonaldB has written:

please post some real world images not some hypothetical images that have never won a image competition.

I have, I take photographs because I like to take photographs and not based on what other persons like.

all talk are we now. 😂 ive just about had enough of you guys so now im going to use my methods to show you what skill is.

w787 (2023_05_22 06_54_50 UTC).jpg
JPG, 4.4 MB, uploaded by DonaldB on June 26, 2023.
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IanSForsyth
Members 216 posts

June 26, 2023, 2:49 a.m. June 26, 2023, 2:49 a.m.
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@DonaldB has written:

i can show 100 at this standard.

I usually stay away from criticizing images but there is a lot of artifacts that take away from the image
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DonaldB
Members 2365 posts

June 26, 2023, 2:50 a.m. June 26, 2023, 2:50 a.m.
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@IanSForsyth has written:

@DonaldB has written:

its not an image he took

But it shows you can have clipping.
The sad thing if you want to get snarky is that at this time you can not understand how there can be clipping

your all full of it. no photography skills to match your mouth. so you have to post hypothetical images.😂😂
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DonaldB
Members 2365 posts

June 26, 2023, 2:51 a.m. June 26, 2023, 2:51 a.m.
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@IanSForsyth has written:

@DonaldB has written:

i can show 100 at this standard.

I usually stay away from criticizing images but there is a lot of artifacts that take away from the image

post your own then lets see how good you are. your all talk.
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IanSForsyth
Members 216 posts

June 26, 2023, 2:52 a.m. June 26, 2023, 2:52 a.m.
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@DonaldB has written:

all talk are we now. 😂 ive just about had enough of you guys so now im going to use my methods to show you what skill is.

For me there is too much processing ( mind you many may find this as eye candy similarly to the tone mapping fad) I preferer a more natural look with pleasing transitions in the OOF areas for macro work
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DonaldB
Members 2365 posts

June 26, 2023, 2:57 a.m. June 26, 2023, 2:57 a.m.
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@IanSForsyth has written:

@DonaldB has written:

all talk are we now. 😂 ive just about had enough of you guys so now im going to use my methods to show you what skill is.

For me there is too much processing ( mind you many may find this as eye candy similarly to the tone mapping fad) I preferer a more natural look with pleasing transitions in the OOF areas for macro work

for starters you cant even take an image of this standard ,so what makes you think you know how to make judjement.. as i said you have no idea ,so unless you can post an image equal or better i would hold you pathetic comments to yourself.