EOS Rebel T8i image differences in Av vs. Manual

[stevet1]

I'll state right up front that I am puzzled.

I have noticed this before, but I don't understand why there is a difference.

If I take a shot in Aperture Priority Mode, and take the exact same picture in Manual Mode with the exact same settings, the Av shot looks more washed out or lighter, and the Manual shot looks fuller.

Here's an example. I drew a dark diagonal line at the bottom of the Manual exposure to differentiate between the two. Look at the brown field in the upper right quadrant.

The settings are irrelevant, but they were both shot at 1/100, f/7.1 and ISO at 100. They were taken through a window. so you have to take that into account, but both were. I've noticed the difference before, even outside in the open air.

Why is there a difference?

It makes me want to stick with Manual.

Steve Thomas

[kvbarkley]

What Camera?

Is the white balance the same in both?

How about the Picture Style?

[stevet1]

kvbarkley,

Yes. All settings (Picture Style, White Balance, etc) remained the same.

The camera is a T8i.

Steve Thomas

[jrhoffman75]

Same metering mode?

[p4pictures]

Which picture style do you use? The default is AUTO, and that means the camera chooses between standard, portrait and landscape styles based on what it thinks the photo is. I would make sure you select a specific picture style, standard or fine detail are my preferences. Each of the three styles portrait, landscape and standard have different amounts of contrast and colour saturation, as well as colour rendering. 

[p4pictures]

On many cameras of recent generations - DSLR and mirrorless - when you select manual exposure mode the camera will also deactivate auto lighting optimiser too. This can be overridden, but not many people do so. 

I just checked an EOS 7D Mark II (2014), EOS R10 and EOS R6 Mark II, if you find the Auto Lighting Optimiser on the red menu you will see that a check mark is present to disable ALO in manual and bulb modes. You can clear the check mark so that the ALO is done the same in Av and M. 

[stevet1]

Brian,

Auto Lighting Optimizer has been disabled in the Menu.

Steve Thomas

[p4pictures]

Steve,

Is it disabled for both Av and M modes? On my cameras with default settings using AV, P, Tv then ALO is on and for M & bulb ALO is off.

[stevet1]

Brian,

Thanks. Yes it is off in both modes.

I'm going to do what Peter suggested and look at the Exif data of a couple of SOOC jpgs. There may be a decimal point or two variation between what I put in and what comes out.

Steve

[Peter]

If you share two untouched JPEG files from the camera it would be easier to troubleshoot.

$ Exiftool -all yourfile1.JPEG > yourfile1.txt

$ Exiftool -all yourfile2.JPEG > yourfile2.txt

In Linux, use Diff to compare the difference.

$ diff yourfile1.txt yourfile2.txt > difference.txt

In Windows, use fc.

fc yourfile1.txt yourfile2.txt > difference.txt